thuyet minh tkcs (xb).pdf

Thu in Khnh Thng TKCS

Nhng ngi tham gia lp v kim tra h s i

NHNG NGI THAM GIA LP V KIM TRA H S

TT H v tn Chc danh - Nhim v K tn

1 on L Phng Hiu Lp thuyt minh phn thy cng

2 Trn ng H Lp thuyt minh phn thi cng

3 Nguyn Phng Thng Lp thuyt minh phn c thy lc, nh my

4 Trn Qun Lp thuyt minh phn c thy cng

5 Lng Hu Nhn Lp thuyt minh phn in

6 Nguyn Th Phng Hng Kim tra h s


Bin ch h s ii

NI DUNG BIN CH H S

H s D n u t cng trnh thy in Khnh Thng c bin ch thnh cc tp sau: Bo co tm tt Bo co nh gi tc ng mi trng TP 1 : THUYT MINH D N U T TP 2 : THIT K C S Tp 2.1 : Thuyt minh kh tng thu vn Tp 2.2 : Thuyt minh a hnh - a cht Tp 2.3 : Cc bn v a cht Tp 2.4 : iu tra thit hi, bi thng, h tr v ti nh c Tp 2.5 : Thy nng - kinh t nng lng Tp 2.6 : Qui trnh vn hnh cng trnh Tp 2.7 : Thuyt minh thit k c s Tp 2.8 : Cc ph lc tnh ton Tp 2.9 : Cc bn v thit k c s Tp 2.10 : Tng mc u t Tp ny l tp 2.7 ca h s.


Mc lc iii

MC LC

Chng 1: M U ..................................................................................................1 1.1. TNG QUAN V LU VC CA D N..................................................1 1.1.1. Lu vc sng Ci Nha Trang .............................................................................1 1.1.2. Lu vc sui Ea Ngar.........................................................................................1 1.2. V TR V NHIM V CA CNG TRNH ..............................................2 1.2.1. V tr cng trnh ..................................................................................................2 1.2.2. Nhim v ca cng trnh ....................................................................................2 1.3. CP CNG TRNH V TN SUT THIT K ........................................2 1.4. THNG S CHNH V QUY M CC HNG MC CNG TRNH ...3 1.4.1. Cc thng s chnh ca cng trnh .....................................................................3 1.4.2. Quy m cc hng mc cng trnh.......................................................................5 1.5. TNG HP KHI LNG CC CNG TC CHNH ............................9 1.6. CC TIU CHUN, QUY PHM P DNG CHO D N....................11 1.6.1. Tiu chun chuyn ngnh xy dng.................................................................11 1.6.2. Tiu chun chuyn ngnh cng ngh ...............................................................11 1.7. CC CHNG TRNH S DNG TRONG TNH TON .....................12 1.8. C S PHP L LP D N U T ....................................................12 Chng 2: IU KIN T NHIN V TI LIU C BN ..............................1 2.1. TI LIU A HNH ......................................................................................1 2.1.1. Cng tc khng ch mt bng v cao ............................................................1 2.1.2. Cng tc thnh lp bn a hnh ....................................................................2 2.1.3. Cng tc o v mt ct cng trnh v mt ct thu vn......................................3 2.1.4. Cng tc o ni cao ta .................................................................................4 2.1.5. nh gi ti liu a hnh....................................................................................4 2.2. TI LIU A CHT .....................................................................................5 2.2.1. Khi qut v a cht khu vc ............................................................................5 2.2.2. a cht thu vn................................................................................................6 2.2.3. ng t khu vc ...............................................................................................6 2.2.4. Khong sn lng h ............................................................................................6 2.2.5. iu kin a cht cng trnh khu vc nghin cu.............................................6 2.2.6. nh gi iu kin a cht cng trnh phng n tuyn.................................15


Mc lc iv

2.2.7. Vt liu xy dng thin nhin...........................................................................22 2.2.8. iu kin a cht cng trnh h cha..............................................................24 2.2.9. nh gi kh nng mt nc ca h cha........................................................24 2.2.10. nh gi kh nng ti to v trt l b h .....................................................25 2.2.11. Kt lun v kin ngh........................................................................................25 2.3. KH TNG THU VN ............................................................................26 2.3.1. iu kin t nhin ............................................................................................26 2.3.2. c trng kh hu .............................................................................................30 2.3.3. c trng thu vn ...........................................................................................33 2.3.4. Kt lun v kin ngh........................................................................................42 Chng 3: MI TRNG & BI THNG TI NH C ...Error! Bookmark not defined. 3.1. NH GI TC NG TRONG GIAI ON CHUN B..............Error! Bookmark not defined. 3.1.1. Cc hot ng trong giai on chun b ...........Error! Bookmark not defined. 3.1.2. Tc ng n mi trng t nhin ...................Error! Bookmark not defined. 3.1.3. Tc ng n mi trng kinh t- vn ho- x hi ........ Error! Bookmark not defined. 3.2. NH GI TC NG GIAI ON XY DNG....Error! Bookmark not defined. 3.2.1. Tc ng n mi trng t nhin ...................Error! Bookmark not defined. 3.2.2. Tc ng n mi trng kinh t - vn ho - x hi ...... Error! Bookmark not defined. 3.3. NH GI TC NG GIAI ON VN HNH....Error! Bookmark not defined. 3.3.1. Tc ng n mi trng t nhin ...................Error! Bookmark not defined. 3.3.2. Tc ng n mi trng kinh t - x hi ........Error! Bookmark not defined. 3.4. BIN PHP GIM THIU TC NG XU, PHNG NGA V NG PH S C MI TRNG...............................Error! Bookmark not defined. 3.4.1. Bin php gim thiu cc tc ng giai on chun b .. Error! Bookmark not defined. 3.4.2. Bin php gim thiu cc tc ng giai on xy dng . Error! Bookmark not defined. 3.4.3. Bin php gim thiu cc tc ng giai on vn hnh . Error! Bookmark not defined. 3.5. CAM KT THC HIN CC BIN PHP BO V MI TRNG Error! Bookmark not defined. 3.5.1. Tun th cc iu lut.......................................Error! Bookmark not defined.


Mc lc v

3.5.2. Thc hin cc gii php bo v mi trng .....Error! Bookmark not defined. 3.6. CC CNG TRNH X L MI TRNG, CHNG TRNH QUN L V GIM ST MI TRNG .............................Error! Bookmark not defined. 3.6.1. Cc cng trnh x l mi trng ......................Error! Bookmark not defined. 3.6.2. Chng trnh qun l mi trng.....................Error! Bookmark not defined. 3.6.3. Chng trnh gim st mi trng ...................Error! Bookmark not defined. 3.7. D TON KINH PH CHO CC CNG TRNH MI TRNG ..Error! Bookmark not defined. 3.7.1. Cc cng trnh x l mi trng ......................Error! Bookmark not defined. 3.7.2. Kinh ph gim st mi trng...........................Error! Bookmark not defined. 3.8. THAM VN KIN CNG NG...............Error! Bookmark not defined. 3.8.1. kin ng ...................................................Error! Bookmark not defined. 3.8.2. kin khng ng ........................................Error! Bookmark not defined. 3.8.3. kin khc.......................................................Error! Bookmark not defined. 3.8.4. kin ca ch u t v vic tip thu kin ca a phng................. Error! Bookmark not defined. 3.9. CH DN NGUN CUNG CP S LIU, D LIU V PHNG PHP NH GI...........................................................Error! Bookmark not defined. 3.9.1. Ngun ti liu, d liu tham kho ....................Error! Bookmark not defined. 3.9.2. Ngun ti liu, d liu do ch d n, t vn to lp ..... Error! Bookmark not defined. 3.9.3. Phng php p dng trong qu trnh nh gi tc ng mi trng...... Error! Bookmark not defined. 3.9.4. Nhn xt v mc chi tit, tin cy ca cc nh gi .....Error! Bookmark not defined. 3.10. CC KT LUN V KIN NGH V NH GI TC NG MI TRNG .........................................................................Error! Bookmark not defined. 3.10.1. Kt lun.............................................................Error! Bookmark not defined. 3.10.2. Kin ngh ..........................................................Error! Bookmark not defined. Chng 4: THY NNG & KINH T NNG LNG .......Error! Bookmark not defined. Chng 5: CNG TRNH THY CNG ...............................................................1 5.1. C S TNH TON THIT K....................................................................1 5.1.1. Cp cng trnh v tn sut thit k .....................................................................1 5.1.2. Cp ng t thit k ..........................................................................................1 5.2. LA CHN S KHAI THC.................................................................1 5.3. SO CHN TUYN CNG TRNH................................................................2


Mc lc vi

5.3.1. Bc 1 ...................................................................................................................2 5.3.2. Bc 2 ...................................................................................................................3 5.4. SO CHN CC THNG S CHNH CA CNG TRNH ......................4 5.4.1. Bc 1 ...................................................................................................................4 5.4.2. Bc 2 ...................................................................................................................6 5.4.3. Thng s chnh ca phng n kin ngh...........................................................7 5.5. SO CHN KT CU CC HNG MC CNG TRNH ..........................7 5.5.1. Phng n kt cu cm u mi.........................................................................7 5.5.2. Kt cu cm tuyn nng lng...........................................................................7 5.6. THIT K C S PHNG N KIN NGH...........................................9 5.6.1. Bc 1 ...................................................................................................................9 5.6.2. Bc 2 .................................................................................................................16 Chng 6: THIT B CNG NGH .......................................................................1 6.1. THIT B C KH THU LC ....................................................................1 6.2. THIT B C KH THU CNG.................................................................1 6.2.1. Bc 1 ...................................................................................................................1 6.2.2. Bc 2 ...................................................................................................................6 6.2.3. p ph bc 2 ...................................................................................................10 6.3. THIT B IN .............................................................................................12 6.3.1. u ni nh my vo h thng in Quc gia..................................................12 6.3.2. My pht in xoay chiu.................................................................................14 6.3.3. My bin p chnh ca t my..........................................................................18 6.3.4. Thit b v bin php dn dng in, mch in p my pht 6,3kV ..............21 6.3.5. H thng t dng in xoay chiu 400/230V...................................................23 6.3.6. Thit b phn phi h th 400V ........................................................................24 6.3.7. H thng phn phi din t dng 1 chiu.........................................................24 6.3.8. Chiu sng in ................................................................................................25 6.3.9. H thng ni t v chng st ton cng trnh .................................................25 6.3.10. Thng tin lin lc..............................................................................................26 6.3.11. H thng o m mua bn in nng ...............................................................27 6.3.12. H thng bo chy v cha chy ......................................................................28 6.3.13. H thng iu khin, gim st, bo v rle v o lng nh my ...................29 6.3.14. Thit b phn phi 35kV...................................................................................32 6.3.15. B tr thit b.....................................................................................................34 6.3.16. Lit k thit b v vt liu phn in ................................................................35


Mc lc vii

Chng 7: T CHC THI CNG...........................................................................1 7.1. IU KIN T NHIN C NH HNG N XY DNG ................1 7.1.1. iu kin a hnh...............................................................................................1 7.1.2. iu kin a cht ...............................................................................................1 7.1.3. iu kin thu vn..............................................................................................2 7.2. VT LIU XY DNG ..................................................................................2 7.2.1. Vt liu t..........................................................................................................2 7.2.2. Vt liu ...........................................................................................................2 7.2.3. Vt liu ct..........................................................................................................3 7.2.4. Cc vt liu khc.................................................................................................3 7.3. BIN PHP THI CNG .................................................................................3 7.3.1. Cng tc o t .................................................................................................3 7.3.2. Cng tc o ..................................................................................................3 7.3.3. Cng tc p t ............................................................................................4 7.3.4. Cng tc b tng .................................................................................................5 7.3.5. Bin php lp t thit b ....................................................................................9 7.4. DN DNG THI CNG ...............................................................................10 Chn tn sut thit k dn dng ....................................................................................10 La chn gii php dn dng thi cng ..........................................................................12 7.5. TNG TIN THI CNG .......................................................................16 7.6. TNG MT BNG THI CNG ..................................................................16 7.6.1. Quy hoch tng mt bng thi cng...................................................................16 7.6.2. Quy m khu ph tr..........................................................................................17 7.6.3. ng giao thng trong cng trng ...............................................................18 7.6.4. Cung cp in thi cng .....................................................................................20 7.6.5. H thng cp nc phc v thi cng v sinh hot............................................21 7.6.6. H thng thng tin lin lc ...............................................................................22 7.7. VN CHUYN VT T THIT B N CNG TRNG ..................22 7.7.1. Khi lng vn chuyn ....................................................................................22 7.7.2. Phng n vn chuyn vt t, thit b n cng trng...................................22 7.7.3. Vn chuyn hng siu trng, siu trng .........................................................22 7.8. BIN PHP AN TON TRONG THI CNG ............................................22 7.8.1. Cc quy tc an ton c bn trn cng trng ...................................................22 7.8.2. Cc bin php an ton trn cng trng...........................................................23 Chng 8: TNG MC U T..............................Error! Bookmark not defined.


Mc lc viii

8.1. C S LP TNG MC U T.................Error! Bookmark not defined. 8.1.1. Ni dung v c cu Tng mc u t ..............Error! Bookmark not defined. 8.1.2. C s lp Tng d ton ....................................Error! Bookmark not defined. 8.1.3. Nhn cng.........................................................Error! Bookmark not defined. 8.1.4. My thi cng.....................................................Error! Bookmark not defined. 8.1.5. Vn chuyn thit b...........................................Error! Bookmark not defined. 8.1.6. Cng thc tng hp n gi .............................Error! Bookmark not defined. 8.1.7. Chi ph Qun l d n, chi ph t vn u t xy dng, chi ph khc...... Error! Bookmark not defined. 8.1.8. Chi ph li vay trong thi gian xy dng cng trnh ...... Error! Bookmark not defined. 8.2. GI TR TNG MC U T ......................Error! Bookmark not defined. Chng 9: KT LUN V KIN NGH ................................................................1 9.1. KT LUN .......................................................................................................1 9.1.1. Ti liu c s thit k.....................................................................................1 9.1.2. S ph hp vi Quy hoch .................................................................................1 9.1.3. Tn d n ............................................................................................................1 9.1.4. a im xy dng cng trnh ............................................................................1 9.1.5. Nhim v v qui m d n .................................................................................2 9.1.6. Hiu ch kinh t v ti chnh...............................................................................4 9.1.7. Tin xy dng cng trnh...............................................................................5 9.1.8. Tng mc u t.................................................................................................5 9.2. KIN NGH ......................................................................................................5 9.2.1. Xc nh ch u t ............................................................................................5 9.2.2. Hnh thc qun l d n .....................................................................................5 9.2.3. Kin ngh ............................................................................................................5


Chng 1: M u 1-1/12

Chng 1: M U

1.1. TNG QUAN V LU VC CA D N

1.1.1. Lu vc sng Ci Nha Trang Sng Ci Nha Trang l ngun ti nguyn nc ln nht v c vai tr rt quan

trng trong s nghip pht trin kinh t- x hi ca tnh Khnh Ho, l ngun nc cung cp chnh cho thnh ph du lch Nha Trang vi gn 40 vn dn, cho nh my si Nha Trang v cc nh my ch bin nng thu hi sn, nc ti cho 10 vn ha t nng nghip pha Nam ca tnh, y l ngun nc phc v dn sinh huyn Din Khnh v thnh ph Nha Trang. Tuy nhin lng nc n ca Sng Ci Nha Trang cng nh cc sng ngi khc phn b rt khng u theo thi gian. Ma kh ko di t thng 1 n thng 8 l thi k kh hn nht trong nm. Do dng chy trn sng cn rt nh lm mn xm nhp su vo t lin, nh hng cho vic cp nc cho thnh ph du lch, cc vng ven, cc nh my ng thi nh hng nghim trng n mi trng sinh thi. V vy vic xy dng cc cng trnh thu in, thu li trn sng Ci Nha Trang c kt hp xy dng h cha nc pha thng lu s gp mt phn vo vic ct l, chng hn, y mn nhm khai thc tt ti nguyn nc ca sng Ci Nha Trang.

1.1.2. Lu vc sui Ea Ngar Bt ngun t vng ni c cao 1150m 1620m ca cao nguyn Lm ng,

sui Ea Ngar chy theo hng Ty Ty Bc- ng ng Nam v n UB x Khnh Thng chuyn hng Ty Bc- ng Nam. n khu vc thn Trang c cao t 55m 60m, sui Ea Ngar hp lu vi mt s sng khc nh sng Mu, sng Gia Li,... to thnh Sng Ci ra bin ng theo hng ng.

Trn sui Ea Ngar c nhiu thc ln. Vi s chnh lch nhau kh ln v cao thun tin cho vic b tr thu in nh ct nc cao. Vi chiu di sng khng ln (3,5km 4km), sui Ea Ngar c ct nc a hnh khong 560m.

Cn c theo bn ng tr ma, lu vc ca sui Ea Ngar nm trong vng c lng ma bnh qun kh ln. Modun dng chy bnh qun nhiu nm khong t 40 60 l/s.km2.

Hin ti trn dng chnh ca Sng Ci v sui Ea Ngar, c th khai thc c 3 cng trnh theo phng thc khai thc ct nc a hnh v dng chy c bn l ch yu. Trong , thu in Sng Ci c a vo quy hoch thu in nh ton quc ca B Cng nghip theo ni dung cng vn s 3454/Q-BCN ngy 18/10/2005.

Din tch lu vc sui Ea Ngar l 124km2. Din tch lu vc tnh n tuyn p thu in Khnh Thng l 50,5km2 chim 40% tng din tch lu vc sui Ea Ngar.


Chng 1: M u 1-2/12

1.2. V TR V NHIM V CA CNG TRNH

1.2.1. V tr cng trnh Cng trnh thu in Khnh Thng d kin xy dng trn thng ngun sui

Ea Ngar, thuc a phn x Khnh Thng, huyn Khnh Vnh, tnh Khnh Ho. Ton b d n gm 2 bc cng trnh nhm khai thc ti a ngun tr nng t

nhin vn c ca lu vc. Nh my ca cc bc c to a l theo h VN 2000 nh sau:

Nh my bc 1: - X = 1 364 609 - Y = 555 457

Nh my bc 2: - X = 1 364 529 - Y = 556 516

1.2.2. Nhim v ca cng trnh Cng trnh c nhim v pht ln h thng in Quc gia vi tng cng sut lp

my N = 18 MW, cng sut bo m cho c 2 bc l 2,82 MW, sn lng in trung bnh nhiu nm Eo = 77,31 triu kWh.

Bng 1.1. Chi tit cng sut v nng lng ca cc bc

TT Thu in Khnh Thng Nlm (MW) Nb (MW) Eo (106 Kwh) 1 Bc 1 11 1,66 46,56

2 Bc 2 7 1,16 30,75

1.3. CP CNG TRNH V TN SUT THIT K Theo Tiu chun xy dng Vit Nam TCXD VN 285:2002, da vo nng lc

phc v v c tnh k thut ca cc cng trnh thu, cng trnh thy in Khnh Thng thuc cp cng trnh nh sau:

- Tuyn u mi l p b tng trn nn , chiu cao ln nht khong 25m thuc cng trnh cp IV.

- Nh my thy in vi cng sut 11,0 MW (bc 1) v 7,0 MW (bc 2) , thuc cng trnh cp III. Tng ng vi cp cng trnh dn, cc loi tn sut thit k v mc m bo

tnh ton nh sau: Tn sut m bo pht in : p = 85% Tn sut lu lng, mc nc ln nht thit k : p = 1,5% Tn sut lu lng, mc nc ln nht kim tra : p = 0,5% Tn sut lu lng thit k chn dng qua mt ma kh : p = 10% Tn sut gi ln nht : p = 4%.


Chng 1: M u 1-3/12

1.4. THNG S CHNH V QUY M CC HNG MC CNG TRNH

1.4.1. Cc thng s chnh ca cng trnh Bng 1.2. Cc thng s chnh ca thu in Khnh Thng

Bc 2 TT Hng mc n v Bc 1

H chnh H ph I c trng lu vc 1 Din tch lu vc Km2 45,3 50,5 22,0 2 Lng ma trung bnh nhiu nm X0 mm 2300 2300 2300 3 Lu lng trung bnh nhiu nm (Qo) m3/s 2,09 2,33 1,02 4 Mduyn dng chy nm Mo l/s.km2 46,1 46,1 46,3 II H cha 1 Cp thit k m Cp IV 2 MNDBT m 722,0 324,0 324,2 3 MNC m 717,0 324,0 324,2 4 MNLKT (p = 0,5%) m 726,24 330,64 327,34 5 MNLTK (p = 1,5%) m 725,51 329,42 326,93 6 Dung tch ng vi MNDBT 103m3 95,83 2,09 2,57 7 Din tch lng h ng MNDBT ha 1,13 0,10 0,12

III Lu lng

1 Lu lng thit k ln nht ca nh my thy in m3/s 3,81 3,81 1,55

2 Lu lng nh l ng vi cc tn sut - Q (p = 0,5%) m3/s 1068 1263 563 - Q (p = 1,5%) m3/s 790 955 432

IV p b tng trng lc 1 Cao trnh nh p m 728,0 332,5 328,0 2 Chiu cao p ln nht m 25,0 7,0 6,7 3 Chiu di theo nh (k c trn+ CLN) m 80,5 60,9 56,2 4 Chiu rng nh p m 3,5 3,5 3,5 V p trn 1 Dng trn Trn t do-mc phixerop 2 Cao trnh ngng trn m 722,0 324,0 324,2 3 Chiu di din trn m 44,0 30,5 44,3 4 Lu lng x l ng vi cc tn sut - Q (p = 0,5%) m3/s 1061,45 1255,38 562,69 - Q (p = 1,5%) m3/s 784,39 947,72 431,78 5 Trng thi chy Phun xa Chy ngp Chy ngp


Chng 1: M u 1-4/12


H chnh H ph VI Cng x ct (Kt hp dn dng) 1 Cao trnh ngng m 704,0 319,7 320,5 2 Kch thc BxH (1 khoang) m 3,0x3,0 3,0x3,0 2,0x2,0

VII Tuyn nng lng a Cp thit k Cp III b Knh dn nc 1 Lu lng thit k m3/s 3,81 3,81 1,55 2 Chiu di knh m 574,3 925,1 462,9 3 Mt ct knh bxh m 1,5x1,7 1,5x1,7 1,0x1,0 4 dc knh % 0,002 0,002 0,004 5 Hnh thc kt cu Knh hp c sn BTCT c B p lc 1 B rng y b p lc (b) m 3,4 4,0 2 Chiu di b p lc (L) m 26 40 3 Chiu cao b p lc m 6,7 6,0 d ng ng p lc 1 S ng ng ng 1 1 2 Chiu di ng ng p lc m 943,8 516,5 3 ng knh ng p lc m 0,8 1,1 e Nh my 1 Qmax m3/s 3,81 5,36 2 Qb m3/s 0,513 0,822 3 Cng sut lp my Nlm MW 11 7 4 Cng sut m bo MW 1,66 1,16 5 Ct nc ln nht m 396,4 169,0 6 Ct nc tnh ton m 354,1 156,5 7 in lng trung bnh 106kWh 46,56 30,75 8 S t my t 2 3 9 Loi tuabin (trc ngang) Penton Francis

VIII Tng tin thi cng (khng k thi gian chun b) nm 2,5

IX Tng mc u t 109VN 432,622 X Ch tiu kinh t - Ti chnh Ch tiu kinh t 1 ENPV 109VN 2 EIRR %


Chng 1: M u 1-5/12


H chnh H ph 3 B/C 4 Gi bn ma kh (/kWh) 5 Gi bn ma kh (/kWh) Ch tiu ti chnh 1 FNPV 109VN 2 FIRR % 3 B/C 4 Gi thnh /kWh 5 Thi gian hon vn nm

1.4.2. Quy m cc hng mc cng trnh Bng 1.3. Quy m cc hng mc chnh ca thu in Khnh Thng


H chnh H ph I Tuyn u mi 1 p dng (khng trn)

1.1 Kt cu p BT trng lc 1.2 Cao trnh nh p m 728,0 332,5 328,0 1.3 Chiu rng nh p m 3,5 3,5 3,5 1.4 Chiu di theo nh (k c trn+ CLN) m 80,5 60,9 56,2 1.5 Chiu cao p ln nht m 25,0 7,0 6,7 1.6 Mi dc thng/h lu 0/0,7 0/0 0/0 2 Trn x l (p trn)

2.1 Dng trn Trn t do-mc phixerop 2.2 Cao trnh ngng trn m 722,0 324,0 324,2 2.3 Chiu di din trn m 44,0 30,5 44,3 2.4 Hnh thc tiu nng Phun xa Chy ngp Chy ngp3 Cng x ct (kt hp dn dng thi cng)

3.1 Cao ngng m 704,0 319,7 320,5 3.2 Kch thc cng, BxH m 3,0x3,0 3,0x3,0 2,0x2,0 3.3 Chiu di m 21,5 25,0 12,0 3.4 dc dc 0,05 0,0 0,05 3.5 Ch vn hnh (ca van) X ct ma l II Tuyn nng lng 1 Cng ly nc ti p


Chng 1: M u 1-6/12


H chnh H ph 1.1 Cao trnh ngng m 715,0 322,0 323,0 1.2 Cao trnh sn cng tc m 728,0 332,5 328,0 1.3 Chiu di cng ly nc m 14,5 18,1 9,0 1.4 Kch thc ca van nBH m 1x1,2x1,2 1x1,2x1,2 1x1,0x1,01.5 Kch thc li chn rc nBH m 1x2,0x2,0 1x2,0x2,0 1x1,3x1,31.6 Chiu di b tiu nng m 15,4 13,4 8,0 1.7 Cao trnh y b tiu nng m 713,9 321,1 322,5 2 Knh dn nc

2.1 Cao trnh y u/cui knh m 715,0 322,0 323,0 2.2 Cao trnh y cui knh 713,82 320,15 322,14 2.3 Chiu di knh m 574,3 925,1 463,0 2.4 dc y knh 0,002 0,002 0,004 2.5 Kch thc knh hp c sn bxh m 1,5x1,7 1,5x1,7 1,0x1,0 2.6 Chiu di cu kin c sn m 2 2 2 3 B p lc

3.1 Cao trnh y b p lc m 709,0 316,3 3.2 B rng y b p lc m 3,4 4,0 3.3 Chiu di b p lc m 26,0 40,0 3.4 Chiu di on chuyn tip m 9,0 12,0 3.5 Mc nc ln nht trong b p lc m 715,22 321,83 3.6 Mc nc nh nht trong b p lc m 713,86 321,46 3.7 Mc nc bnh thng trong b p lc m 715,08 321,65 3.8 Cao trnh nh b p lc m 715,7 322,3 3.9 Kch thc cng x ct bxh m 1x1 1x1 4 ng ng p lc (bng thp)

4.1 S ng ng ng 1 1 4.2 ng knh trong m 0,8 1,1 4.3 Chiu dy v ng mm 14 12 4.4 Chiu di ng ng m 943,8 516,5 4.5 S lng m no m 9 4 5 Nh my thy in

5.1 Kch thc nh my m 19,8 x 29,6 12 x 33,2 5.2 Cao trnh lp tuc bin m 334,20 153,50 5.3 Cao trnh gian lp rp m 333,3 159,50 5.4 S t my 2 3 6 Knh x (knh hp BTCT)


Chng 1: M u 1-7/12


H chnh H ph 6.1 Cao trnh y u knh m 330,10 152,00 6.2 Chiu di knh m 13,80 24,84 6.3 dc y knh 0 0 6.4 Kch thc knh hp bxh m 3x2,4 3x2,8 III Cng trnh tm dn dng thi cng 1 Cng dn dng Tn dng cng x ct m 3,0x3,0 3,0x3,0 2,0x2,0 2 quai

2.1 Cao trnh nh quai thng lu m 710,5 324,5 328,0 2.2 Chiu di quai thng lu m 30,7 30,6 44,5 2.3 Cao trnh nh h lu m 699,5 319,5 2.4 Chiu di quai h lu m 11,5 20,2 IV Phn cng ngh 1 Tua bin thy lc

1.1 Kiu loi Pelton Francis 1.2 S t my 2 3 1.3 Ct nc tnh ton ( tr tn tht) Htt m 354,1 156,5 1.4 Cng sut nh mc ti Htt 1.5 Vng quay nh mc 1.6 ng knh bnh xe cng tc D1 1,4 0,84 1.7 Hiu sut ln nht 1.8 Hiu sut ln nht ti ct nc Htt, Nm 1.9 Lu lng tua bin ti Htt, Nm 2 My pht in

2.1 Kiu loi ng b, trc ngang, 3 pha 2.2 S t my 02 03 2.3 Cng sut biu kin nh mc MVA 6,875 3,125 2.4 H s cng sut cos 0,8 0,8 2.5 in p nh mc kV 6,3 6,3 2.6 Tn s dng in Hz 50 50 2.7 S vng quay ng b v/pht 500 1000 2.8 Vng quay lng v/pht 900 1000 IV Tng d ton 109 432,622 1 Xy dng cng trnh 109 319,761 2 Mi trng v n b 109 1,229 3 ng dy 35kV v cp in thi cng 109 33,132


Chng 1: M u 1-8/12


H chnh H ph 4 ng vn hnh cng trnh 109 78,500 V Tng tin 1 Thi gian thi cng nm 2,5 2 Thi gian chun b nm 0,5 3 Thi gian a vo vn hnh khai thc nm 2011

VI Ngun vn 1 Vn t c % 30 2 Vn vay v cc ngun vn huy ng khc % 70

Thu in Khnh Thng DAT

Chng 1: M u 1-9/12

1.5. TNG HP KHI LNG CC CNG TC CHNH Bng 1.4. Tng hp khi lng phng n kin ngh

Cng trnh bc 1 Cng trnh bc 2

TT Ni dung cng vic n v p+Trn+Cng x ct+CLN

Knh dn B p lc ng ng Nh myDn dng thi cng

Tng KL bc 1

p+Trn+Cng x ct+CLN

p ph+ Trn+Cn

g x ct+CLN

Knh chnh Knh ph B p lc

ng ng Nh my

Dn dng thi cng

Tng KL bc 2

1 Din tch pht quang 103m2 6,254 32,343 3,050 19,140 8,793 69,580 2,669 3,541 20,848 12,044 1,680 12,850 2,306 55,938

2 o t edQ 103m3 6,920 56,924 18,406 95,639 34,022 211,911 3,604 0,635 49,343 13,510 6,336 83,080 25,290 181,799

3 o t IA1 103m3 4,410 21,359 5,645 39,051 20,763 91,229 0,810 1,192 15,948 9,730 11,348 37,390 6,551 82,969

4 o t IA2 103m3 5,347 9,829 2,850 17,880 35,907 0,532 1,203 11,916 0,903 17,425 19,010 50,989

5 o phong ha IB 103m3 6,049 10,279 3,207 8,807 28,341 2,134 2,229 9,161 0,188 0,752 0,370 0,944 15,777

6 o nguyn khi IIA 103m3 3,525 1,437 0,723 5,685 0,623 0,692 1,236 0,035 0,476 3,062

7 o t th cng 103m3 0,200 0,200 0,250 0,030 0,280

8 p t tn dng 103m3 2,969 1,061 1,890 0,577 2,610 9,107 0,171 0,025 5,971 2,070 1,318 0,440 1,760 2,840 14,595

9 p gia c 103m3 0,180 0,180 0,360 0,360

10 p hp long 103m3 0,290 0,290 1,920 1,920

11 D b quai 103m3 3,070 3,070 5,120 5,120

12 D b tng xy M100 103m3 0,830 0,830 0,460 0,460

13 4x6 103m3 0,071 0,071 0,038 0,034 0,072

14 xy M100 103m3 3,304 0,025 0,650 0,050 0,830 4,859 1,824 0,465 0,062 0,550 0,160 0,460 3,520

15 B tng M100 103m3 0,115 0,022 0,040 0,177 0,191 0,079 0,025 0,020 0,315

16 B tng hc M150 103m3 9,417 9,417 0,297 0,740 1,037

17 B tng M150 103m3 0,060 0,120 0,180 0,010 0,015 0,104 0,129

18 B tng M200 103m3 1,263 0,213 1,476 0,286 0,289 0,263 0,838

19 B tng ct thp M200 103m3 1,728 0,645 1,170 1,482 5,025 0,400 0,490 0,885 0,710 2,417 4,902

20 B tng ct thp M200 (c sn) 103m3 0,632 0,632 1,043 0,277 1,320

21 B tng ct thp M250 103m3 1,519 1,519 0,383 0,401 0,784

22 B tng cu giao thng M250 103m3 0,071 0,071 0,078 0,078

23 Dm lc 103m3 0,025 0,025 0,010 0,012 0,018 0,040

24 Ct lc 103m3 0,040 0,040 0,018 0,020 0,028 0,066

25 ng nha PVC, d100 103md 0,526 0,526 0,081 0,090 0,365 0,536

26 Gch xy 103m3 0,243 0,243 0,347 0,347

27 Trng c 103m2 3,232 21,190 5,276 29,698 1,334 1,500 12,880 2,027 17,741

28 Bao ti tm nha ng (2 lp) 103m2 0,957 0,034 0,991 0,040 0,145 0,031 0,216

29 PVC (Sika); (Bng chng thm) 103md 0,301 0,315 0,035 0,652 0,038 0,055 0,508 0,100 0,048 0,749

30 Khoan no anke 103md 0,000 0,117 0,100 0,217

Thu in Khnh Thng DAT

Chng 1: M u 1-10/12

Cng trnh bc 1 Cng trnh bc 2

TT Ni dung cng vic n v p+Trn+Cng x ct+CLN

Knh dn B p lc ng ng Nh myDn dng thi cng

Tng KL bc 1

p+Trn+Cng x ct+CLN

p ph+ Trn+Cn

g x ct+CLN

Knh chnh Knh ph B p lc

ng ng Nh my

Dn dng thi cng

Tng KL bc 2

31 Khoan chng thm nn p 103md 0,495 0,495 0,000

32 Lan can thp Tn 5,610 0,990 6,600 2,079 1,023 1,386 4,488

33 Lp dng lan can thp 103m2 0,136 0,024 0,160 0,050 0,025 0,034 0,109

34 Thp lm cu thang phi 18 Tn 0,129 0,129 0,194 0,129 0,323

35 Thp v ko, x g 21,024 21,024 27,601 27,601

36 Ct thp cho b tng Tn 150,740 37,920 32,255 69,880 81,510 372,305 41,362 39,665 62,602 13,462 44,250 36,470 132,935 370,746

37 Thit b c kh thy cng Tn 37,410 16,330 300,010 58,000 411,750 21,960 14,590 18,480 171,940 59,600 286,570

38 Thit b c kh thy lc MW 11,0 11,0 7,0 7,0


Chng 1: M u 1-11/12

1.6. CC TIU CHUN, QUY PHM P DNG CHO D N

1.6.1. Tiu chun chuyn ngnh xy dng Trong tnh ton s dng mt s tiu chun tnh ton chuyn ngnh ca Vit

Nam v quc t, c th nh sau: - Tiu chun xy dng Vit Nam TCXD VN 285-2002 - Qui phm ti trng v lc tc ng ln cng trnh Thy li QPTL.C-1-78 - Qui phm tnh thy lc p trn QPTL.C-8-76 - Qui phm tnh ton thy lc cng di su QPTL.C-1-75 - Qui trnh tnh ton tn tht thy lc do ma st dc theo chiu di ng dn

nc: QPTL.C-1-75 - Tiu chun thit k p b tng v b tng ct thp 14 TCN 56-88. - Tiu chun thit k p t m nn 14 TCN 157 2005 - Nn cc cng trnh thy cng - Tiu chun thit k TCVN 4253-86 - Thit k dn dng thi cng trong xy dng cng trnh thy li 14 TCN 57-88

1.6.2. Tiu chun chuyn ngnh cng ngh Cc tiu chun, qui phm chuyn ngnh cng ngh s dng gm:

- TCVN 2622: 1995. Phng chy, chng chy cho nh v cng trnh. yu cu thit k.

- TCVN 5760: 1993. H thng cha chy, yu cu chung thit k, lp t v s dng.

- TCVN 5738: 1993. H thng bo chy. yu cu thit k.

- BHT-41-94. Tiu chun thit k phn cng ngh nh my thy in v nh my thy in tch nng PAO. Lin bang Nga.

- CHu III-18-75 Tiu chun v nguyn tc xy dng phn kt cu thit b thy cng v kt cu kim loi. y ban Nh nc v xy dng, trc thuc hi ng b trng Lin x.

- IEC 34. My pht. Tiu chun quc t. - IEC 76. My bin p. Tiu chun quc t. - IEC71- IEC 721. Cp cch in. Thit b ng ct cao th v trung th. Tiu

chun quc t. - Cng trnh thy li- my ng m kiu cp, thit k, ch to, lp t 14 TCN

189:2006. - Cng trnh thy li- my ng m kiu xi lanh thy lc, thit k, lp t,

nghim thu, bn giao, yu cu k thut 14 TCN 192:2006.


Chng 1: M u 1-12/12

1.7. CC CHNG TRNH S DNG TRONG TNH TON Cc chng trnh sau y c s dng thit k d n thu in Khnh

Thng: - Chng trnh tnh n nh mi Slope/W ca hng Geo-Slope Ver 5.0 Canada. - Chng trnh tnh thm Seep/W ca hng Geo-Slope Ver 5.0 Canada. - Chng trnh tnh ton nc va v giao ng trong thp Transient ver 5.5 - Chng trnh tnh thy lc dng h HEC-RAS ca Qun i M - Chng trnh tnh ton thy nng Ressim-Pro - Chng trnh tnh thy ng lc hc dng sng Mike 11 c bn quyn ca an

Mch. - Chng trnh FENAS tnh ton v kt cu v phn tch nhit trong b tng khi

ln.

1.8. C S PHP L LP D N U T Thu in Khnh Thng thuc lu vc sng Ci tnh Khnh Ho c lp

trn c s: - Cng vn s 6531/UBND ngy 05/10/2007 ca UBND tnh Khnh Ho v/v b

sung quy hoch thu in Khnh Thng vo quy hoch pht trin thu in va v nh trong c nc.

- Thng bo s 466/TB-UBND ngy 31/10/2005 ca UBND tnh Khnh Ho v/v cho php lp d n u t nh my thu in ti x Khnh Thng, huyn Khnh Vnh.

- Cng vn s 4638/UBND ngy 11/10/2005 v/v cho php Cng ty C phn u t v Pht trin in Min trung lp d n u t nh my thu in Khnh Thng.

- Cng vn s 3180/BCT-NLDK ngy 21/11/2007 ca B Cng thng v/v b sung quy hoch d n thu in Khnh Thng, tnh Khnh Ho.

- Quyt nh s 248/CT/T ngy 3/10/2007 ca Cng ty C phn T&PT in Min trung v/v ph duyt cng kho st lp d n u t cng trnh thu in Khnh Thng.

- Cn c Hp ng dch v t vn s: 01/2007/HTV ngy 09 thng 10 nm 2007 c k kt gia Cng ty C phn u t v Pht trin in Min Trung vi Cng ty C phn TVXD in 4 v vic kho st phc v lp d n u t, lp d n u t cng trnh thy in Khnh Thng.


Chng 2: iu kin t nhin v ti liu c bn 2-1/43

Chng 2: IU KIN T NHIN V TI LIU C BN

2.1. TI LIU A HNH

2.1.1. Cng tc khng ch mt bng v cao trnh sai s tch ly v nng cao chnh xc, cn thit phi xy dng h

thng li khng ch trc a theo nguyn tc t tng th n cc b, t chnh xc cao n chnh xc thp.

H thng li khng ch c xy dng bao trm khu vc o v, n l c s thnh lp bn a hnh t l 1/2000 (h=1m), bn t l 1/5000 (h=2m) v b tr tuyn cng trnh.

V khng ch mt bng, s dng cc im a chnh c s (H VN2000, kinh tuyn trc 108015, mi chiu 30) lm c s pht trin tng dy cc cp li khng ch.

Bng 2.1. Cao to cc im mc khng ch mt bng

Ta Tn im

X (m) Y (m)

cao thy chun tm thi

(m) Ghi ch

93423 1356042,034 561686,434 229,520 Hng III

934405 1357274,188 571880,809 31,591 Hng IV

934406 1356992,789 567059,616 37,580 Hng IV

2.1.1.2. Li khng ch mt bng

a. Li tam gic hng IV Cn c vo phm vi o v v c im a hnh khu vc o c phc tp, thc

ph c che ph ln, im gc xa khu o, do li tam gic hng IV c thnh lp bng cng ngh GPS, s dng my nh v v tinh GPS Leica500. Li c pht trin t cc im ta v cao Nh nc bao gm 4 im.

Ti cc trm o u c phi pht thng hng ngm cho tng cp im. Gc ngng ti im trm o m bo thng thong 150o.

b. Li ng chuyn cp 1 Da vo cc im tam gic Hng IV, xy dng h thng li ng chuyn cp 1

bao trm khu vc o v, phc v cho vic xy dng li ng chuyn cp 2 v li o v. Li ng chuyn cp 1 bao gm 10 im c b tr ri u dc khu vc o v li c o bng cng ngh GPS v phng php ton c.

c. Li ng chuyn cp 1 Do iu kin a hnh v phm vi o v bn , ng chuyn cp 2 c b tr

ti khu vc tuyn ng p lc bao gm 14 im. Li c o ni vi cc im Hng



IV, cc im ng chuyn cp 1. Li cp 2 o bng phng php ton c v cng ngh GPS. 2.1.1.3. Li khng ch cao

a. Thu chun hng IV Theo d kin tuyn thy chun hng IV c xut pht t th trn Khnh Vnh o

vo khu vc u mi. Nhng do ti th trn Khnh Vnh khng c im cao Nh Nc, nn li thy chun c o ni t hai im cao Hng I Nh Nc nm th trn Din Khnh cch khu o khong 50 km. Li c dn theo qui trnh hng IV, s dng my NA820 v mia g 2 mt. Dc tuyn o trung bnh 5 km c chon mt mc thu chun, k hiu TC1, TC2, , TC10.

b. Thu chun k thut T cc im thy chun hng IV, pht trin cc tuyn thy chun k thut dn

qua cc im khng ch mt bng v cc im khng ch o v phc v cho o v bn . Cng tc thy chun k thut dng phng php o cao hnh hc v lng gic. Li c dn theo ng quy phm o thy chun, s dng my thy chun NA820, mia g hai mt v my Leica TC305.

2.1.2. Cng tc thnh lp bn a hnh - Bn t l 1/2.000 (h=1m) khu vc cng trnh (gm 3 mnh) vi tng din tch:

180 ha. - Bn t l 1/5.000 (h=2m) khu vc ph tr (gm 1 mnh) vi tng din tch:

180ha. 2.1.2.1. Xy dng li khng ch o v

a. Li khng ch mt bng Da vo cc im ng chuyn cp 1, 2 c xy dng trong khu o, tin

hnh lp cc ng chuyn kinh v 1, 2 v tip tc pht trin v tng dy cc ng chuyn ton c. - o gc bng: Dng my kinh v in t , o mt vng o vi chnh lch gia hai

na ln o khng qu 45. Sai s khp gc trong ng chuyn t: (n: s gc ca ng chuyn).

- o chiu di: Dng my ton c in t v gng n. o cnh vi chnh xc t yu cu: ms/S < 1:2000.

- Tnh ton bnh sai: Dng phng php bnh sai n gin, sai s khp fs/[s] < 1:2000 b. Li khng ch cao Li khng ch cao o v l cp cui cng c pht trin t cc im cao

k thut hin c trong khu vc. Li c xy dng bng phng php o cao lng gic v tin hnh o ng thi vi li khng ch mt bng, chiu cao my c o 2 ln vi chnh xc 1cm. Sai s cho php t: Trong : S l chiu di cc cnh.

nfb''60

)(04,0

cmn

Sf h

=



n s cnh trong li. Tnh ton bnh sai theo phng php gn ng.

2.1.2.2. Cng tc o v chi tit

Da vo cc im khng ch mt bng (cp 1, cp 2), pht trin cc ng chuyn kinh v, ton c v li o v, b tr cc trm my o v chi tit.

Cng tc o v ngoi thc a c tin hnh theo phng php ta cc. S dng cc loi my ton c in t TC305, TC705 v cc gng n, vi

chiu di tia ngm khng c ln hn 200m. 2.1.2.3. Cng tc v bn

Bn c v bng phn mm Autodesk land Desktop. S liu o v cc im chi tit c lu gi trong cc my ton c in t. Cng tc thnh lp bn c tin hnh ti hin trng v c kim tra i sot cho tng vng, tng mnh.

Bn c bin tp vi 3 mu c bn: - Mu xanh l cho thy h. - Mu nu cho dng a hnh - Mu en cho a vt.

2.1.3. Cng tc o v mt ct cng trnh v mt ct thu vn 2.1.3.1. C nh tuyn ngoi thc a

Da vo bn a hnh t l 1/2000 c vch cc tuyn mt ct cng trnh do Ch nhim n cp.

Da vo cc im khng ch c b tr trong khu vc, chuyn tt c cc im u v im cui ca cc mt ct ra thc a v o v chi tit a hnh cc mt ct.

Dng cc cc g c nh tuyn, k hiu l F1, F2,..., Fn. Ti cc im u, im cui, im ngot ca tuyn c ng bng cc mc b tng, khong cch o trc tip bng my ton c in t, vi chnh xc ms = 2mm+2ppm, cc gc ngot c o theo phng php o gc n gin. 2.1.3.2. o cao dc tuyn

xc nh cao cc im trn mt ct c xc nh bng phng php o cao lng gic.

Cc im u, cui, cc v tr chuyn hng ca cc mt ct c o ni h thng cao to khu vc cng trnh. 2.1.3.3. Tnh ton bnh sai

Da vo cng tc o ni cao ta ti cc im u, im cui, cc im ngot trn tuyn. Cng tc tnh ton c thc hin theo phng php bnh sai gn ng.



2.1.4. Cng tc o ni cao ta Da vo cc im khng ch thnh lp, tin hnh cng tc o ni cao to

n cc v tr khoan, o a cht cc im u, im cui v cc im chuyn hng ca tuyn cng trnh theo phng php ta cc.

2.1.5. nh gi ti liu a hnh Ton b cc ti liu a hnh hon thnh c lp tun th theo cc quy trnh

quy phm o c hin hnh ca Tng cc a chnh, m bo cht lng phc v lp D n u t cng trnh thy in Khnh Thng.

Bng 2.2. TNG HP KHI LNG CNG TC A HNH

TT Ni dung cng vic n v KL ph duyt

KL thc hin Ghi ch

1. Kho st a hnh khu vc u mi 1 Tam gic hng IV im 4 4 a hnh cp V 2 ng chuyn cp 1 im 13 10 a hnh cp V 3 ng chuyn cp 2 im 15 14 a hnh cp V 4 Thy chun Hng IV km 50 101,15 a hnh cp V 5 Thy chun k thut km 20 10,326 a hnh cp V 6 o v bnh t l 1/2000 (h=1m) ha 180 180 a hnh cp V 7 o v bnh t l 1/5000 (h=2m) ha 180 180 a hnh cp V 8 o v mt ct dc km 3,3 3,866 a hnh cp V

+ Trn cn km 3,2 3,847

+ Di nc km 0,1 0,019 9 o v mt ct ngang trn cn km 5,2 3,193 a hnh cp V 2. a hnh phc v a cht 1 ng chuyn cp 2 im 9 0 a hnh cp V 2 Thy chun k thut km 3 0 a hnh cp V 3 Lp bn t l 1/5000 (h=2m) ha 18 0 a hnh cp V 4 o ni cao ta im 68 14 a hnh cp V

3. a hnh phc v thu vn 1 o v mt ct ngang sui km 1,6 0,865 a hnh cp V

+ Trn cn km 1,5 0,645

+ Di nc km 0,1 0,220 2 o v mt ct dc sng km 1,2 0,794 a hnh cp V



2.2. TI LIU A CHT

2.2.1. Khi qut v a cht khu vc 2.2.1.1. a tng

Trong vng nghin cu phn b cc thuc cc a h sau:

- H tng La Ng (J2ln): thnh phn gm cc ct kt, bt kt, st kt v sng. - H t: phn b dc sng sui, thnh phn gm ct, cui si v tng.

2.2.1.2. Macma xm nhp

Trong vng nghin cu, hot ng xm nhp pht trin mnh m. Phc h o C (Kc) c dng batholit kch thc kh ln. Thnh phn gm cc granit sng mu. 2.2.1.3. V tr kin to

Vng nghin cu l mt b phn ca ai phun tro- xm nhp Mesozoi mun Lt; gm cc xm nhp thnh phn trung tnh n a xt phn b thnh i t Ph Yn n ng Nam B vi phng cu trc Ty Bc- ng Nam. Chng l sn phm hot ho magma kin to thnh ra lc a kiu Aldes v l 1 phn ca ai ni la ng Nam . Lch s pht trin a cht vng c bit r t Jura n T vi cc phc h, thnh h kin trc (hoc cc t hp thch kin to) nh sau:

* Phc h, thnh h kin trc bin ra lc a th ng Mesozoi mun Trn bnh chng c m t trong h tng La Ng. Trn quy m khu vc,

cc trm tch Jura phn b rt rng ri, chim cc din tch ln vng Nam Trung B v Lt. Trong vng, chng cn st li di dng mt mnh nh gn trong trng phn b granit phc h o C. Cu to un np ca phn v a tng ny b ph hu mnh m. ng thi, di tc ng ca qu trnh magma xm nhp, cc t nhiu b nung nng, ti kt tinh v tr nn cng rn hn. Ton b khu nh my bc 2 v mt phn tuyn ng ng thuc phc h cu trc ny.

* Phc h, thnh h kin trc ra lc a tch cc kiu Ander Mesozoi mun. Bao gm cc granit sng mu kim vi thuc phc h nh Qun i km

vi cc ai mnh sm mu v sng mu. Trn quy m khu vc, phc h thnh h cu trc ang m t phn b rt rng

ri. Mi lin quan khng gian vi phc h, thnh h kin trc bin ra lc a th ng Mesozoi mun rt r rng. Cc xm nhp granitoit phc h nh Qun xuyn ct v gy bin cht cc trm tch h tng La Ng.

* Phc h, thnh h kin trc lp ph khng bin dng Kainozoi. Bao gm cc trm tch b ri thnh phn ct cui si v tng khng gn kt to

nn cc bi bi quy m khng ln phn b dc sng. 2.2.1.4. Cc h thng ph hu t gy

Trong vng pht hin v ghi nhn 2 h thng ph hu t gy lin quan vi cc pha bin dng dn. l cc h thng Ty Bc- ng Nam, ng Bc- Ty Nam.



2.2.2. a cht thu vn c im iu kin a cht thy vn khu vc c th tm tt nh sau: Kh hu vng nng- m: Lng ma ln, tnh thm t yu to iu kin

thun li cho nc di t pht trin. Khu vc d n vi a hnh c dc ln nn tr lng nc di t ngho. Tt c tng cha nc u thuc loi nc khng c p. Ngun cung cp nc di t cho tt c cc tng l nc ma, im thot

nc l mng li sng v sui. Mc nc di t v ma ma nm nng (trong t eluvi), v ma kh kh

su bin thin t 10- 30m. C ch cn su hn (thng nm ranh gii di ca i IA2 hoc trong i IB).

Thnh phn ha hc ca tt c cc tng nc di t u xp x nhau vi tng khong ha nh, thuc loi Bicacbonat Clorua natri- kali magie, c ch l Canxi manh v khng c tnh n mn b tng.

2.2.3. ng t khu vc ng t khu vc thu in Khnh Thng theo bn kin to v phn vng

ng t t l 1/1.000.000 ca vin Vt l a cu lp nm 2003 vng c phng ng t cp Imax



a hnh. Cc khe sui thng nh v phn nhnh, cc gc l nhiu lng sui. Cc trm tch aluvi hu nh vng mt.

- Cc khi ni thoi v thp ven thung lng sng Ci: ti y, cc gc t l, lp ph tn tch v sn tch dy. Trn cc dng chy xut hin trm tch aluvi, l tch proluvi. Lng h thu in Khnh Thng trng vi thung lng ny.

a hnh tch t: Cc a hnh tch t lin quan vi cc di trm tch tr h T l cc cc bi

bi tch, l tch pht trin dc sng. Din phn b hp, ko di khng lin tc dc theo thung lng sng Ci. B mt cc bi bi thng thoi, hi nghing v pha dng chy, cao tng i dao ng t 1-2m n di 5-7m. Kch thc cc bi bi thng c b rng nh 5-15m chiu di vi chc mt n di vi trm mt. Thnh phn tch t ch yu l ct cui si, tng ln n rt ln. Chiu dy tch t 1-5m.

b. Hot ng kin to hin i Phn tch cc nh vin thm, cc bn a hnh cng nh cc quan st a

cht, hin cha quan st c cc mt phacet kin to cng nh cc ph hu t gy ct qua cc bc thm, bi bi. Ni cch khc, trong vng cng tc hin cha pht hin c cc t gy ng i c du hiu ang hot ng. 2.2.5.2. c im a tng

Trn t bn a cht t l 1/5.000 c thnh lp, trong vng cng tc cc trm tch lc nguyn c mt hn ch khu nh my 2 v ng ng bc 2 ca cng trnh. Cn c vo bnh cu trc, mi quan h a cht, thnh phn thch hc, chng c lin h vi cc phn v a tng ch yu nh sau:

Gii Mesozoi, h Jura, thng gia H tng La Ng (J2 ln)

H tng La Ng do Nguyn c Thng thnh lp trong qu trnh o v bn a cht t l 1:200.000 lot Bn Kh - ng Nai. Trong phm vi nghin cu ca thu in Khnh Thng h tng c din phn b rt hp ti khu vc ng ng v nh my bc 2 ca cng trnh. Cc trm tch l nh khng lin tc theo cc sui. Trong cc h khoan KT13, KT14 c th quan st c cc phn khc nhau ca n v a tng ny.

Thnh phn thch hc bao gm cc lp st bt kt v st kt xen k. mu xm nu v xm en, cu to phn lp, un np thoi. Cc b bin v do cc hot ng ph hu t gy. Gn khi xm nhp granit phc h i Lc, b sng ho kh rn chc.

Trn bnh hin i, trm tch nm nghing, gc dc 30 n 50o ng phng cu trc B-TN. Trong phm vi o v quan st c h tng La Ng b cc xm nhp phc h i Lc xuyn ct v gy sng ho, bn thn h tng cha ho thch ch yu c tui Aalen v phc h Bo t phn hoa cha Mesozoi gia mun. V vy h tng La Ng c xp vo Jura trung.

Chiu dy ton b ca h tng La Ng trong vng d kin trn 300m. Gii Kainozoi, H T



Trm tch aluvi (aQIV): Trong khu vc nghin cu trm tch aluvi pht trin rt hn ch, chng phn b ch yu thung lng Sng Ci v cc sui. Thnh phn gm ct nh n ct th c ln cui - tng, chiu dy ch mt vi mt.

Ngoi ra, trn ton b b mt ca c ngun gc khc nhau (tr lng sng, sui) u c ph kn sn tn tch (edQ) v tn tch (eQ) khng phn chia. Chng hu ht thuc loi t hn tng, t st pha c cha dm sn. Chi tit c im v phong ho ny s c m t nhng phn sau. 2.2.5.3. Cc thnh to mc ma xm nhp

Magma xm nhp trong vng pht trin mnh. Theo cc c im thnh phn thch hc, mi quan h khng gian vi cc trm tch lc nguyn h tng La Ng, chng c th lin h vi phc h o C vi cc c im sau y.

Phc h o C (Kdc) Phc h o C do Hunh Trung v NNK thnh lp ln u tin vo nm 1980

trong cng tc lp bn a cht min Nam Vit Nam t l 1:500.000 vi khi chun o C. Sau phin hiu a cht ny c s dng rng ri trong cc vn liu a cht Vit Nam. Theo cc ng, phc h o C c thnh phn t granodiorit, granit biotit n granosienit.

Trn bnh t l nh v quy m ln hn, din tch phn b ca khi granit trong vng cng tc ch l 1 b phn ca 1 khi batolit ln phn b kh rng trong vng cng tc. Ranh gii bao quanh khi vng vnh v c xu hng phnh to ra pha di. Chng c quan h xuyn ct v gy bin cht nhit cc trm tch lc nguyn h tng La Ng. Trong vng cng tc, cc thuc phc h o C chim cc di ni cao ca a hnh.

Thnh phn thch hc v cc quan h a cht cho php m t mt pha xm nhp chnh v pha mch vi ni dung nh sau.

Pha xm nhp chnh. Thnh phn granit biotit ht va n th. Pha mch. Pha mch rt pht trin bao gm cc ai mch xm mu v

sng mu. Chng hin din di cc dng ai chiu dy t 0,5m n vi mt, ko di 1-2m n vi chc mt thng nh hng ch yu B-TN. Ranh gii tip xc gia cc ai mch v vy quanh r rng khng thy cc i bin cht nhit cng nh bin cht trao i. Thnh phn cc ai mch sng mu l aplit, cc ai mch sm mu l lamprophyr, diorit porphyrit, microdiorit.

Tui ca phc h c xp vo Crta khng phn chia. Cc h thng t gy Trn c s phn tch bn a hnh, nh v tinh, bn a cht thch hc c

th nhn thy trong vng pht hin v ghi nhn 2 h thng ph hu t gy lin quan vi cc pha bin dng dn. l cc h thng ng Bc- Ty Nam, Ty Bc- ng Nam.

- H thng ng Bc- Ty Nam. y l h thng ph hu t gy ch o trong ton vng. Chng ct ton b

cc c tui Mesozoi. Du hiu ch yu ca t gy l cc i c nt dp v v cc i khe nt tng cao. Chiu di cc i t gy dao ng t 1-2 km n 3-4km, i



khi b ngt qung chia ct thnh cc on ngn. Chiu rng ca cc i ph hu dao ng t 1-2m n di 10-15m.

Trong khu vc nghin cu cc t gy thuc h thng ny gm: t gy VI.1, VI.2, V.5, V.6, V.7, V.8, V.9.

- H thng t gy Ty Bc- ng Nam. Chng c xc nh trn cc du hiu i dp v tng cao, i kataclasit, cc

i p nn mnh cng nh cc du hiu gin tip a mo v cc dng chy duy tr phng ko di n nh.

Cng nh h thng ng Bc- Ty Nam, h thng Ty Bc- ng Nam ct qua cc trm tch v xm nhp tui Mesozoi.

Trong khu vc nghin cu cc t gy thuc h thng ny gm: t gy V.1, V.2, V.3, V.4.

Nh vy, trong khu vc nghin cu ch c cc i ph hu kin to ni i tng ng vi t gy bc IV, cc khe nt bc V, VI, VII theo TCVN 4253-86.

Bng 2.3. Bng phn loi cc t gy v khe nt kin to theo TCVN 4253-86

Bc Chiu rng ca i ph hu v m ca khe nt

Chiu rng i nh hng (m)

Chiu di

t gy trung bnh IV 0,5-1,5m 3-10 1-3km t gy nh V 0,1-0,5m 1-3 0,3-1km Khe nt ln VI 2-10cm 0,3-1,0 100-300m Khe nt trung bnh VII 5-20mm 0,1-0,3 30-100m Khe nt nh VIII 2-5mm



- i phong ho mnh (IA2) - i phong ho (IB) - i nt n, gim ti ( IIA) - i tng i nguyn vn (IIB) M t chi tit cc i phong ho c trnh by trong bng 2

Bng 2.4. Bng phn chia cc i phong ha

Cp t (nh mc XDCB s 1242/1998..)M t t o c gii o th cng

Lp sn tn tch (edQ): Gm t st pha, st ln 5-10% dm sn, trng thi na cng n cng.

t cp 3: 50% t cp 4: 30% cp 4 chim

20%

t cp 3: 50%t cp 4: 30% cp 4

chim 20%

i phong ho mnh lit (IA1): Thnh phn ho hc ca hon ton b bin i, b oxit ho rt mnh, tuy cn gi c cu trc ca m nhng tr thnh t ln dm sn.

t cp 3: 40% t cp 4: 40% cp 4 chim

20%

t cp 3: 40%t cp 4: 40% cp 4

chim 20% i phong ho mnh( IA2): Thnh phn ho

hc ca b bin i mnh tr thch anh, s gn kt ca b gim mnh, b oxit st ho mnh. mm yu, nt n rt mnh, phn y cn st nhng tng tng i cng chc.

t cp 4 chim 50% cp 4 chim

50%

i phong ho (IB): b bin i mnh dc theo cc khe nt, cng chc trung bnh, cc b mt khe nt b oxit st ho, nn khoan dng dm cc v thi.

t cp 4: 10% cp 3: 70% cp 2: 20%

i nt n (IIA): kh ti b mt khe nt b oxit st ho hoc khng b oxit st ho, mu sc ca hu nh khng b bin i, cng chc, nt n mnh (bc ca khe nt



hin ca cc hin tng xm thc bo xi ca cc dng chy mt v trt l ca tng ph (hin tng trt l thng sy ra vo ma ma l mang theo nhng tng ln xung lng sng, sui).

Do hot ng xm thc su pht trin kh mnh nn dc theo thung lng sng Ci v cc sui nhnh thng gp cc nn, bi phng vt thnh phn ch yu l dm sn tng v tng ln n rt ln.

Hin tng l thng gp dc theo cc thung lng sng, sui vo ma ma. 2.2.5.5. c im a cht thu vn v tnh thm ca t

a. Phn lp cc tng cha nc Khu vc nghin cu c nc mt tng i phong ph, cc sui chnh v ma

kh u c nc chy, nc mt v nc di t quan h kh cht ch, da vo cu trc a cht, c im t trong vng chia ra cc phc h cha nc sau: - Phc h cha nc trong cc thnh to aluvi. - Phc h cha nc trong cc thnh to xm nhp phc h o C. - Phc h cha nc trong thnh to trm tch lc nguyn h tng La Ng.

b. Phc h cha nc trong cc thnh to aluvi Cc thnh to aluvi pht trin theo nhng di hp hai bn b sng, lng

sng.Thnh phn l ct cui si ln tng, i khi c gp cc thu knh ct ht nh v vy c th ni tnh thm nc, cha nc l khng ng nht. Ngun cp nc l nc ma, nc mt v mt phn t cc tng v phc h cha nc trn cao. Lu lng nc c quan h thu lc trc tip vi dng chy sng.

Kt qu phn tch thnh phn ha hc theo cng thc CucLp c tn gi: Bicacbonat Clorua natri- kali magie:

0.7214

22066

243

631.0 )(

pHCaMgKNa

ClHCOM +++

+

Nc c tnh n mn yu so vi b tng (Theo tiu chun TCVN149-1986 xt trong iu kin: Cng trnh khng chu p lc, t thm trung bnh n mnh, b tng c c chc trung bnh).

c. Phc h cha nc trong cc thnh to xm nhp phc h o C Phc h cha nc ny chim din tch mt din tch ln, thnh phn thch hc

ca phc h ch yu l granit. Nc cha v vn ng trong cc khe nt ca , dao ng theo ma, ma ma mc nc ngm thng nm trong i phong ho mnh v phong ha mnh lit, ma kh mc nc ngm nm su trong i IB hoc IIA. Phc h thuc loi ngho nc.

Ngun cung cp nc l nc ma, nc t cc tng trn cao ngm xung, min thot nc l cc b sng, sui v sn cc thung lng. Qua cc th nghim thm trong cc h khoan cho thy mc thm nc v tng tr nc trong yu, thun li cho vic thot nc h mng khi thi cng.

Kt qu phn tch thnh phn ho hc theo cng thc CucLp c tn gi: Bicacbonat Clorua natri- kali:



( ) 0.7252148142

348

01.0 pHMgCaKNaClHCOM +++

+


d. Phc h cha nc trong thnh to trm tch lc nguyn h tng La Ng Phc h cha nc ny chim din tch nh khu vc nh my v ng ng

bc 2, thnh phn thch hc ca phc h ch yu l st kt, bt kt. Nc cha v vn ng trong cc khe nt ca , dao ng theo ma, ma ma mc nc ngm thng nm trong i phong ho mnh v phong ha mnh lit, ma kh mc nc ngm nm su trong i IB hoc IIA phc h thuc loi ngho nc.

Ngun cung cp nc l nc ma, nc t cc tng trn cao ngm xung, min thot nc l cc b sng, sui v sn cc thung lng. Qua cc th nghim thm trong cc h khoan cho thy mc thm nc v tng tr nc trong yu, thun li cho vic thot nc h mng khi thi cng.

Kt qu phn tch thnh phn ho hc theo cng thc Cuc Lp c tn gi: Bicacbonat Clorua natri- kali magie:

( ) 0.72102177340

360

1.0 pHCaMgKNaClHCOM +++

+


e. Tnh thm t c tnh thm ca t c phn tch v nh gi bng cc kt qu th

nghim hin trng bao gm th nghim nc - mc nc v p nc Lugeon trong l khoan.

Tp hp kt qu th nghim thm ti hin trng, kt hp vi ti liu m t ti cc l khoan- o, xc nh c tnh thm nc ca t theo tng i v tng v tr ghi trong bng 3.

Bng 2.5. Bng tnh thm ca t

i Gi tr Lugeon H s thm (cm/s)

edQ+IA1 4,1x104

IA2 1,0x103

IB 3,9

IIA 2,9



2.2.5.6. Cc tnh cht c l ca t

Bng 2.6. Bng cc c trng c l t nn kin ngh s dng tnh ton

Thnh phn ht %,mm Dung trng, g/cm3

Gii hn m % Trng thi t nhin Trng thi bo ha

>

1

9

2

-

1

9

0

.

0

7

5

-

2

0

.

0

0

5

-

0

.

0

7

5

10m v xc nh r phn cui tuyn p lc n nh my xut hin ti su 11m.

Nhn thy rng, a tng tuyn ng ng v nh my bc 1 gm cc i edQ, IA1, IB, IIA. Tuyn ng ng p lc c tng phong ha trn tuyn tng i dy, trung bnh 15-22m, cc h khoan KT-4 & KT-5 c su 10-15m nn cha xc nh r chiu dy i IA1, ranh gii cc i IA2, i IB, i IIA. Ring phn cui tuyn p lc c cc h khoan KT-6 & KT-7 khoan ti gc nn ranh gii cc i r rng, ti v tr nh my c tng ph mng, knh x sau nh my l gc.

Theo thit k tuyn p lc c y cng trnh hu ht t ti ranh gii di ca i IA1 c chiu su (15-22)m do cn c bin php tnh ton n nh mi o trong qu trnh thi cng. Nn nh my t hon ton trong i IIA granit cng chc.



Tm li, iu kin a cht cng trnh tuyn nh my tng i tt, tuyn p lc c ranh gii cc i cha xc nh r, i gc nm su do vy trong giai on ti cn b sung mt s h khoan ti m no N1, N2, N4, N5, N6. Cc h khoan ny cn cm vo i n nh 1-2m. i vi cc m kin ngh t trn i IA1, IA2 c gia c mng, cc m no nn t trn i IB hoc IIA c tnh n nh cao. Hin ti, ton tuyn c 9 m no th ch c N7 & N9 l t trn i IIA. 2.2.6.3. Tuyn p chnh bc 2

Ti khu vc tuyn khoan kho st thm d 03 h khoan. Vai tri c h khoan KT8 su 10m, lng sui c h khoan KT9 su 15m, vai phi c h khoan KT10 su 10m.

Ton b tuyn p chnh nm trong vng phn b Granit phc h o C. Da vo kt qu nghin cu trn c th nh gi c im CCT tuyn p nh sau:

a. Vai p tri Vai p b tri c b mt sn dc t 40-50o, chiu di khong 25m, mt ct

a cht cng trnh t trn xung gm cc lp t sau: - Lp ph sn tn tch (edQ): Gm st, st pha mu nu , nu vng ln

dm cc, tng l mnh v vn ca gc phong ha v cc tng ln granit cng chc, kch thc vi chc centimet n vi mt. Phn b lin tc trn b mt a hnh, dc theo vai p vi b dy thay i t 0-2,5m.

- i IA1: i phong ha mnh lit ca granit; thnh phn st pha, ct pha ln dm sn; phn b dc theo vai p, chiu dy t 0-1,5m.

- i IA2: i phong ha mnh ca granit, mm yu c ch l dm cc ln st; phn b dc theo vai p, chiu dy t 0-2m.

- i IB: i phong ha trung bnh ca granit, nt n mnh n rt mnh, cc khe nt c lp nht y bi st v oxt st, cng thi gim mnh, chiu dy trung bnh 1-5m.

- i IIA: i nt n ca granit, nm su >5m. Theo thit k tuyn knh dn b tr bn vai tri c y cng trnh gi trc tip

ln i IIA. b. Phn lng sng sui

Phn lng sng sui c chiu rng khong 20m. Mt ct CCT t trn xung gp cc lp sau:

- Tch t ct cui tng lng sng sui (apQ) phn b hu ht trn khu vc nghin cu, chiu dy trung bnh 5m v bin i theo ma. H s thm ln Ktb = 0,2cm/s.

- i IB: i phong ha trung bnh ca granit, nt n mnh n rt mnh, cc khe nt c lp nht y bi st v oxt st, cng thi gim mnh, chiu dy 0,5-1m.

- i IIA: i phong ha nh ca granit nm di lp cui tng v i IB.

c. Phn vai p phi



Vai p b tri c b mt sn dc t 50-55o, chiu di khong 20m, mt ct a cht cng trnh t trn xung gm cc lp t sau:

- Lp ph sn tn tch (edQ): Gm st, st pha mu nu , nu vng ln dm cc, tng l mnh v vn ca gc phong ha v cc tng ln granit cng chc, kch thc vi chc centimet n vi mt. Phn b lin tc trn b mt a hnh, dc theo vai p vi b dy thay i t 0-2m.

- i IA1: i phong ha mnh lit ca granit; thnh phn st pha, ct pha ln dm sn; phn b dc theo vai p, chiu dy t 0-1m.


- i IB: i phong ha trung bnh ca granit, nt n mnh n rt mnh, cc khe nt c lp nht y bi st v oxt st, cng thi gim mnh, chiu dy trung bnh 1-2m v l ra hu ht vai phi.

- i IIA: i nt n ca granit, nm su >4m. Nh vy, a tng tuyn p bc 2 gm cc i edQ, IA1, IA2, IB, IIA. C 1

t gy bc V ct qua lng sng. Kt qu th nghim p nc cho thy nn p c tnh thm nh v c gi tr

bng 0,1-3,3 Lugeon (i IIA). Kt qu th nghim mu cho thy cng khng nn mt trc trng thi

kh go ca i IIA = 918 kG/cm2. Nhn chung, khu vc tuyn p bc 2 c iu kin a cht cng trnh tng i

phc tp. Vai p phi l gc i IB vi chiu dy mng, tng ph mng phn b trn nh vai phi do vy khi lng o bc thp hn nhiu so vi vai tri p. Lng sng sui tn ti lp trm ng ct cui tng tng i dy, c h s thm ln nn cn bc b khi thi cng. Cng tc o bc x l lp ct cui tng lng sng sui lm tng chiu cao p cng v khi lng b tng p p. 2.2.6.4. Tuyn p ph bc 2

Ti khu vc tuyn khoan kho st thm d 01 h khoan KT-11 su 10m ti lng sui.

Ton b tuyn p ph nm trong vng phn b Granit phc h o C. Da vo kt qu kho st c th nh gi c im CCT tuyn p nh sau:

a. Vai p tri Vai p b tri c b mt hnh tng i dc, mt ct a cht cng trnh t

trn xung gm cc lp t sau: - Lp ph sn tn tch (edQ): Gm st, st pha mu nu , nu vng ln

dm cc, tng l mnh v vn ca gc phong ha v cc tng ln granit cng chc, kch thc vi chc centimet n vi mt. Phn b lin tc trn b mt a hnh, dc theo vai p vi b dy thay i t 0,5-1,5m.

- i IA1: i phong ha mnh lit ca granit; thnh phn st pha, ct pha ln dm sn; phn b dc theo vai p, chiu dy t 0-1,5m.





- i IIA: i nt n ca granit, nm su >5m. b. Lng sng sui

Phn lng sng sui c chiu rng khong 23m. Mt ct CCT t trn xung gp cc lp sau:

- i IB: i phong ha trung bnh ca granit, nt n mnh n rt mnh, cc khe nt c lp nht y bi st v oxt st, cng thi gim mnh, chiu dy 0-2m.

- i IIA: i phong ha nh ca granit c chiu dy >10m. Nhn thy phn lng sng sui ch yu l gc, tnh thm trn cc i nh:

i IB = 5,5Lugeon, i IIA = 3,39Lugeon rt thun li cho mc ch lm nn p dng.

c. Vai p phi Tng t nh vai tri, vai phi p cng ch yu l gc, tng ph gm

cc i edQ, IA1, IA2, IB... ch tn ti vi din nh phn b trn nh vai p phi. y ca nhn nc hon ton t trn i IIA.

Tm li, nn p ph bc 2 c cu to a cht rt thun li vi cc thnh to b ri ch tn ti vi din rt nh trn nh hai vai, cn li hu ht l gc cng chc nn thit k d dng chn cc gii php kt cu p ph hp vi yu cu, t hiu qu kinh t. 2.2.6.5. Tuyn knh chnh bc 2

Cng tc kho st thc hin l o v a cht v o h trn tuyn, ring h khoan KT-12 nm cui tuyn knh. Cn c vo cc ti liu hin c, mt ct CCT tuyn m t nh sau:

- Lp ph sn tn tch (edQ): Gm st, st pha mu nu , nu vng ln dm cc, tng l mnh v vn ca gc phong ha v cc tng ln granit cng chc, kch thc vi chc centimet n vi mt. Phn b lin tc trn b mt a hnh, dc theo mt ct tuyn vi b dy thay i t 0,5-5m.

- i IA1: i phong ha mnh lit ca granit; thnh phn st pha, ct pha ln dm sn; chiu dy t 1-4m.

- i IA2: i phong ha mnh ca granit, mm yu c ch l dm cc ln st; phn b dc tuyn cng trnh, chiu dy t 0,5-10,5m.


- i IIA: i nt n ca granit, phn b su 2-20m.



Nhn thy tuyn knh dn c tng phong ha tng i dy, do vy cn c bin php gia c nn ph hp trnh st trt, c bit ti nhng im knh ni khi i qua v tr c a hnh thp th mng cc tr cn gi ln i n nh. 2.2.6.6. Tuyn knh ph bc 2

Tng t nh tuyn knh chnh, cng tc kho st trn tuyn ny ch yu l o v v o h a cht; h khoan KT-12 nm cui tuyn knh. Mt ct CCT trn tuyn cng gm cc i edQ, IA1, IA2, IB, IIA c chiu dy v din phn b ging nh tuyn knh chnh bc 2. Cn c bin php gia c nn ph hp v ti nhng im knh ni khi i qua v tr c a hnh thp th mng cc tr cn gi ln i n nh. 2.2.6.7. Tuyn ng ng p lc bc 2

a. Tuyn ng ng p lc Tuyn ng ng p lc c bt u ti im c cao trnh 332,3m v kt thc

ti im c cao trnh 163,5m (ti m no N4) vi chiu di 498m. Trn tuyn ny khoan 2 h khoan KT-12, KT-13 su 17-20m nhng mi ch qua i IA1 hoc va chm vo i IA2. Trn mt ct tuyn ct qua hai loi , granit phc h o C phn b t im u n l trnh 0+321 v trm tch st bt kt h tng La Ng phn b t l trnh 0+321 n 0+498. Cn c vo cc ti liu kho st c th m t mt ct CCT tuyn nh sau:

* on phn b granit l trnh 0 n 0+321: - Lp ph sn tn tch (edQ): Gm st, st pha mu nu , nu vng ln

dm cc, tng l mnh v vn ca gc phong ha v cc tng ln granit cng chc, kch thc vi chc centimet n vi mt. Phn b lin tc trn b mt a hnh, dc theo mt ct tuyn vi b dy thay i t 2-8m.

- i IA1: i phong ha mnh lit ca granit; thnh phn st pha, ct pha ln dm sn; chiu dy t 1-11m.

- i IA2: i phong ha mnh ca granit, mm yu c ch l dm cc ln st; phn b dc tuyn cng trnh, chiu dy t 3-10,5m.

- i IB: i phong ha trung bnh ca granit, nt n mnh n rt mnh, cc khe nt c lp nht y bi st v oxt st, cng thi gim mnh, chiu dy trung bnh >8m.

- i IIA: i nt n ca granit, phn b su >22m. * on phn b trm tch l trnh 0+321 n 0+498: - Lp ph sn tn tch (edQ): Gm st, st pha mu nu ln dm cc, tng

ln st bt kt, phn b lin tc trn b mt a hnh, dc theo mt ct tuyn vi b dy thay i t 3-8,2m.

- i IA1: i phong ha mnh lit ca st bt kt; thnh phn st pha, ct pha ln dm sn; chiu dy t 8-10m.

- i IA2: i phong ha mnh ca st bt kt, mm yu c ch l dm cc ln st; phn b dc tuyn cng trnh, chiu dy t 0-2,5m.



- i IB: i phong ha trung bnh ca st bt kt, nt n mnh n rt mnh, cc khe nt c lp nht y bi cc vt liu st, cng thi gim mnh, chiu dy trung bnh 1-8m.

- i IIA: i nt n ca st bt kt, phn b su 22-37m. Theo ti liu thit k tuyn ng ng p lc bc 2 ch yu nm trong i IA2,

i IA1, cc m t trn i IB. Granit c cng khng nn mt trc cao, trng bo ha ca i IB =

500 kG/cm2, i IIA = 836 kG/cm2; st bt kt th thp hn vi cng khng nn mt trc trng bo ha ca i IB = 290 kG/cm2, i IIA = 350 kG/cm2.

Trong bn m th cn lu thit k gia c ph hp mng m N3&N4 v hai m ny nm trn i IB st bt kt.

b. Tuyn nh my Nh my c b tr trn khu vc tng i bng phng vi cao 158m. Ti

v tr ny tin hnh khoan h KT-14 su 22m ln lt gm cc i sau: - Lp (epQ): Gm ct cui si ln tng ln, b dy 5-7m, phn b phn

knh x sau nh my. - Lp ph sn tn tch (edQ): Gm st, st pha mu nu ln dm cc, tng

ln st bt kt, b dy 7,9m. - i IA1: i phong ha mnh lit ca st bt kt; thnh phn st pha,

ct pha ln dm sn; chiu dy t 8,3m. - i IB: i phong ha trung bnh ca st bt kt, nt n mnh n

rt mnh, cc khe nt c lp nht y bi cc vt liu st, cng thi gim mnh, chiu dy trung bnh 1,8m.

- i IIA: i nt n ca st bt kt, phn b su >18m. Theo ti liu thit k tuyn nn nh my ch yu nm trong i IB & IIA st

bt kt c cng khng nn mt trc trng bo ha l 290 kG/cm2 (ca i IB), l 350 kG/cm2 (ca i IIA). Cn gia c phn knh x sau nh my vi tng cui si d b xi l trong khi thi cng v trong qu trnh vn hnh.

2.2.7. Vt liu xy dng thin nhin 2.2.7.1. Vt liu t

Vt liu t khu vc ny rt khan him v a hnh dc, qu trnh ra tri xy ra mnh m, cc granit trong khu vc phong ho khng u v c ln nhiu dm sn, tng. Tuy nhin, kt qu l trnh o v trong khu vc xc nh c m t nm cch tuyn p 1 khong 4km, tuyn p 2 khong 3km, tuyn p ph khong 3km. y l m t c ngun gc t sn tn tch ca st kt-bt kt, nm trn sn i thoi u vi gc dc 25-30o, m c kho st nhm tm kim vt liu t p p ph v quy. M c kho st nh gi tr lng cp C.

M c din tch 3,5ha, chiu dy tng bc b l 0,3m, chiu dy tng c ch l 2m ng vi tr lng khong 70.000 m3.

t m l t st cha 2-15% dm sn, c ngun gc sn tn tch, gi tr cc ch tiu c l t ch b kin ngh tnh ton c cho trong bng 7.



Bng 2.8. Bng ch tiu kin ngh tnh ton m t

Cc ch tiu khng ct trng thi bo ho

Mun bin dng

H s thm K

Dung trng kh ln nht

cmax (g/cm3)

m ti u Wop

(%) () C (kG/cm2) E (kG/cm2) (cm/s) 1,52 26,2 18 0,234 140 1x105

Nhn chung, m t c cc ch tiu c l kin ngh p ng cc yu cu s dng lm vt liu t p cho cng trnh. V tr m c a hnh dc, cha c ng giao thng nn vic khai thc v vn chuyn tng i kh khn. Do tr lng t khng nhiu nn kin ngh ch s dng t p quy. Trong tng c ch m t i ch c ln nhiu tng vi kch thc ln, do vy trong qu trnh khi thc cn c loi b m bo cht lng t p 2.2.7.2. Vt liu

V tr m nm sn ni, tng i dc, hin cha c ng ln m . Khu vc m cch tuyn p 2 khong 250 mt v pha h lu.

Tng bc b l hn hp t ln dm sn, tng ln granit, c chiu dy 4m. Khi lng bc b 66.400m3.

Tng c ch l granit cng chc chiu dy trung bnh khai thc thun li l: 20m, tr lng l: 332.000m3.

Bng 2.9. Bng ch tiu kin ngh tnh ton m

Cg. khng nn (KG/cm2)

Kh gi Bo ho

Dung trng kh tuyt i

(g/cm3)

Khi lng ring

(g/cm3)

rng %

c H

H s mm ho

2,70 2,74 1,65 1100 1000 0,99

Tm li m c tng bc b mng, tng c ch l granit c cht lng p ng yu cu lm ct liu b tng. 2.2.7.3. Vt liu ct

M ct nm trong lng sng Ci, thuc x Din Th, c din tch 6ha, chiu dy tng c ch 2m, tr lng m khong 120.000m3. Khong cch t m n cng trnh khong 35-40km, m ko di theo lng sng, ng giao thng thun li n khu vc m.

Thnh phn l ct ht trung, ht th p ng yu cu lm ct liu b tng thy cng v tng lc.

Kt qu th nghim cc mu ct cho thy thnh phn v ch tiu ca ct bo m yu cu cho b tng c th nh sau:



Bng 2.10. Thnh phn v ch tiu m ct

Thnh phn ht (%)

Khi lng th

tch

T trng

D

Hm lng sunfat

Hm lng

bi bn

Gc ngh

10-

5 m

m

5- 2

,5 m

m

2,5-

1,25

mm

1,25

-0,6

3 m

m

0,63

-0,3

1 m

m

0,31

-0,1

5 m

m

< 0,

15 m

m

M un ln M Xp Cht g/cm

3 % % Kh t

4 5 22 32 28 8 5 2,75 1,42 1,68 2,66 0,08 1,5 36 32

2.2.8. iu kin a cht cng trnh h cha H thy in Khnh Thng vi cc phng n p chnh bc 1, p chnh bc

2, p ph u c din tch nh nm trong thung lng sng Ci v sui nhnh. Phm vi nghin cu vng h hp vi cc thnh to ch yu l granit phc h o C.

V c im a hnh, phn ln din tch nghin cu cc c b mt a hnh l ni cao vi b mt rt dc trung bnh t 30-50o; hai b sng l hai vch dng ng, mc phn ct a hnh mnh.

Cc qu trnh ngoi sinh hin ti ca vng h cha ch yu l qu trnh bc mn tch t. Hot ng a cht ng lc trong vng h cha mc yu. Hot ng xm thc ca dng chy l va xm thc ngang, va xm thc thng ng. Hin tng mng xi, rnh xi biu hin qu trnh xm thc su v trt l trong lp ph ch gp mt s b mt sn c dc ln, thng xy ra trong ma ma.

Vng nghin cu c cc phc h cha nc trong tch t aluvi, phc h cha nc trong magma xm nhp. Phc h cha nc trong tch t aluvi c din phn b nh, hp, chiu dy mng nn khng nh hng n iu kin a cht thy vn h cha. Cc phc h cha nc trong thnh to magma xm nhp thuc loi ngho nc. Nc ngm cha v vn ng trong cc khe nt v t gy kin to ca tng gc phong ha nt n.

2.2.9. nh gi kh nng mt nc ca h cha Vic nh gi mt nc ca h cha c xem xt, nghin cu trn c s

cc c im v a cht khu vc; cng tc khoan o a cht, nghin cu tnh thm nc ca t theo tng i, tng loi t theo thnh phn thch hc kt hp vi cc c im a hnh a mo; kt qu ca cng tc ny cho thy:

- Cc h cha thy in Khnh Thng nm trong vng phn b cc xm nhp ca phc h o C, nh vy b h c cu to bi cc gc c tnh cht cch nc. - nh phn thu dc hai bn b h c cao ln hn nhiu so vi mc nc dng bnh thng. Cc gc u khng thm nc. V th, vic mt nc sang lu vc k cn l khng c.



2.2.10. nh gi kh nng ti to v trt l b h Khu vc b ca cc h c cu trc a cht gm cc thnh to magma xm

nhp granit vi b dy tng ph khng ln, cc vch ng thng l gc. Lng h hp v pht trin ng thc.

V kh nng ti to kt hp xem xt cc yu t tc ng quan trng gp phn ti to b dc vch h cha gm:

- Chiu cao sng - dc ca vch b h - Tnh cht t ca b h - su lm vic ca h cha Chiu cao sng: Chiu cao sng ph thuc vo hng gi v chiu di ca h

cha. Nhn chung lng h cc bc ca thu in Khnh Thng u hp v nh nn nh hng ca yu t ny l khng ng k.

Vch b h: Nhn chung vch b h ch yu c dc ln 30 50o gc c l ra trn mt, t hn c dc 20 30o nhng c ph kn cy ci.

Tnh cht t ca b h: Vch b h thng l gc cng chc v mt phn b ph vi t st, st pha cha t dm sn vi cng khng ct trng thi bo ha i edQ: =15o v C = 0,180kG/cm2 ; i IA1: =17o v C = 0,200kG/cm2 .

su lm vic ca h cha: su h nng nn khng c vn ln v ti to vch b h.

Kt hp xem st cc yu t tc ng quan trng gp phn ti to b dc vch h cha cho thy b h c tr s hot ng a cht ng lc mc trung bnh. Cn lu hin tng l trong ma l t trn thng lu xung lng h vi thnh phn l tng c kch thc ln nh hng ti cng trnh.

2.2.11. Kt lun v kin ngh Trn c s phn tch, tng hp cc ti liu kho st trnh by trn, c th

rt ra cc kt lun v kin ngh nh sau: 1. Vng d n thu in Khnh Thng c cu thnh bi cc thnh to

magma xm nhp granit phc h o C, ct kt- st kt- bt kt h tng La Ng v cc thnh to trm tch t.

2. Hot ng t gy ph hy kin to gm 2 h thng t gy phng Ty Bc- ng Nam v ng Bc- Ty Nam. Cc t gy trong vng u l cc t gy nh bc IV, bc V mang tnh ni i khng c kh nng sinh chn v khng c biu hin hot ng ng i.

V ng t khu vc, bn kin to v phn vng ng t t l 1/1.000.000 ca Vin Vt l a cu lp nm 2003 th vng nghin cu nm trong khu vc c cp ng t l cp 6 (h MSK-64).

3. Trong khu vc lng h thu in Khnh Thng tin hnh iu tra khong sn lp bn t l 1:200.000 th cha pht hin cc m khong sn c gi tr khai thc cng nghip.



4. Trong giai on lp DAT thy in Khnh Thng c nghin cu trn hai phng n bc 1 v phng n bc 2. Cc phng n u gm p chnh, tuyn nng lng v nh my, phng n bc 2 c mt p ph. a cht khu vc tuyn c cu to yu bi granit phc h o C, ct kt - st kt - bt kt h tng La Ng v cc thnh to trm tch t.

Granit c cng khng nn mt trc tng i cao, trng bo ha ca i IB = 500 kG/cm2, i IIA = 836 kG/cm2; st bt kt th thp hn vi cng khng nn mt trc trng bo ha ca i IB = 290 kG/cm2, i IIA = 350 kG/cm2.

Kt qu th nghim p nc cho thy nn p c tnh thm tng i nh v c gi tr bng 5-10 Lugeon (i IB) v 0,1-5 Lugeon (i IIA).

V phng n tuyn bc 1: c b tr trn nn granit, mt bng b tr tuyn n gin gm tuyn p v tuyn nng lng. Tuyn p l gc, hu nh khng xut hin lp trm ng cui si trn mt ct. Tuyn nng lng c b dy tng phong ha 15-22m nhng ti nh my th mng hn v ch dy 5m.

V phng n tuyn bc 2: mt bng b tr tuyn phc tp vi 1 tuyn p chnh, 1 tuyn p ph, 2 tuyn knh dn, 1 tuyn p lc v nh my. iu kin a cht phc tp hn gm hai loi t vi tng ph dy hn.

Tm li, gia hai phng n th phng n tuyn bc 1 c nhng iu kin a cht, iu kin thi cng thun li hn phng n tuyn bc 2.

5. Vt liu xy dng: thm d m , m t nm gn cng trnh c thnh phn, tr lng c th

p ng c yu cu. M ct c tr lng v cht lng m bo, nm trong lng sng Ci, thuc x

Din Th, c din tch 6ha, chiu dy tng c ch 2m, tr lng m khong 120.000m3. Khong cch t m n cng trnh khong 35-40km, m ko di theo lng sng, ng giao thng thun li n khu vc m.

6. H thy in Khnh Thng c din tch nh, b h hu ht l gc nn tng i n nh.

Tm li iu kin a cht cng trnh ca d n thu in Khnh Thng l tng i thun li. Cng tc kho st a cht cng trnh c thc hin y v khi lng v theo cng kho st ph duyt. V cht lng p ng c yu cu k thut theo quy nh v m bo iu kin lp D n u t ca cng trnh thu in Khnh Thng.

2.3. KH TNG THU VN

2.3.1. iu kin t nhin 2.3.1.1. c im a l t nhin lu vc

Hu ht sng ngi tnh Khnh Ho c hng Ty Bc- ng Nam v Ty ng. c im ni bt ca sng sui l ngn v dc ( dc trung bnh 5). a hnh trong vng c s chia ct mnh m, cc sng sui chy trn nhng vng a hnh khc nhau, do ch dng chy cng khng ging nhau. C mng li sng sui



phn b kh dy vng ni vi mt li sng khong 0,61,0km/km2 v phn b tha vng thp, vng ng bng ven bin vi mt li sng khong di 0,6 km/km2 (mt li sng c min ni v ng bng, u xp x vi mt li sng trung bnh nc ta l 0,51,0 km/km2). Mt li sng cc vng trong tnh th hin r nhng c im sau y. - Ni c lng ma ln dng chy nhiu, mt li sng dy, nh thng ngun

sng Ci Nha Trang mt li sng t 0,71,0 km/km2. - Vng ven bin a hnh bng phng, ma t, t ct thm nc tt - mt li

sng nh di 0,6 km/km2. Cng trnh thu in Khnh Thng bao gm 3 p chnh (p dng 1, p

dng 2 v p dng 3), c th: p chnh bc 1: Nm trn nhnh sui chnh, c to bi 3 nhnh nh (sui

Lin oan, sui Lin Ran v sui La), sui chy t cao t 14331574m. Lu vc tnh n tuyn p dng 1 c bao bc bi ngn ni cao, c cao t 909 574 m. Lu vc c hnh dng nh dn n tuyn p, lng sng c dc ln. Khi c ma ln c th gy ra l qut v st l t.

p chnh bc 2: Nm cch tuyn p 1 khong 1,6km v pha h lu. p ph bc 2: Nm trn nhnh sui Ea Noni, sui chy theo hng Ty Bc-

ng Nam, bt ngun t ngn Ch Het (cao 1453m). Lu vc tnh n tuyn p c bt ngun t ngn ni cao t 800 1453m. Tng hp c trng hnh thi lu vc tnh n cc tuyn p, xem bng 2.12.3

Bng 2.11. c trng hnh thi sng tnh n tuyn p chnh bc 1

TT c trng lu vc K hiu Tr s n v 1 Din tch lu vc Flv 45,3 km2

2 Chiu di lu vc LLV 8,11 km 3 Chiu di sng chnh Lsc 8,76 km 4 Tng chiu di sng sui Lss 28,3 km 5 dc sng chnh Jsc 40,0 6 dc sn dc Js 288,6 7 B rng lu vc B 5,17 km 8 Mt li sng sui M 0,62 km/km2

Bng 2.12. c trng hnh thi sng tnh n tuyn p chnh bc 2

TT c trng lu vc K hiu Tr s n v 1 Din tch lu vc Flv 50,5 km2

2 Chiu di lu vc LLV 9,48 km 3 Chiu di sng chnh Lsc 10,4 km 4 Tng chiu di sng sui Lss 32,9 km



TT c trng lu vc K hiu Tr s n v 5 dc sng chnh Jsc 91,0 6 dc sn dc Js 290,2 7 B rng lu vc B 4,85 km 8 Mt li sng sui M 0,65 km/km2

Bng 2.13. c trng hnh thi sng tnh n tuyn p ph bc 2

TT c trng lu vc K hiu Tr s n v 1 Din tch lu vc Flv 22 km2

2 Chiu di lu vc LLV 6,48 km 3 Chiu di sng chnh Lsc 7,70 km 4 Tng chiu di sng sui Lss 16,8 km 5 dc sng chnh Jsc 59,0 6 dc sn dc Js 275,5 7 B rng lu vc B 2,86 km 8 Mt li sng sui M 0,80 km/km2

2.3.1.2. c im a hnh

Lu vc tnh n tuyn p u nm pha ty ca tnh Khnh Ho v ton b lu vc nm gn trong tnh Khnh Ho. Nhn chung lu vc c dng a hnh phc tp. cao lu vc c hng nghing theo hng Ty- ng v gim dn v pha tuyn p. Do c im a hnh vng ny b chia ct mnh, dn n s khc bit ng k v kh hu, c bit l ch ma, ch khng kh so vi vng xung quanh. 2.3.1.3. Lp ph th nhng v thm ph thc vt

Nhm t vng phn b trn din rng ca lu vc, vng i ni c hin tng Feralit xy ra mnh. t vng pht trin trn m phin thch. t mn vng trn ni cao, pht trin vng ni cao hn 900-1000m. 2.3.1.4. Nhng nghin cu v ngun nc

Nhm nh gi tim nng ngun nc trn cc h thng sng sui Khnh Ho, t 1980 n nay c nhiu ti nghin cu nh: * Ti liu c im hu thu vn sng ngi Ph Khnh, do i kh tng thu vn tnh Ph Khnh kho st, tng hp, bin son v c tng cc kh tng thu vn thng qua nm 1982. * Ti liu c im kh hu thu vn tnh Khnh Ho, do Phn vin kh tng - thu vn ti thnh ph H Ch Minh (nay i tn l Trung tm Kh tng - Thu vn pha Nam) kt hp vi i Kh tng - Thu vn Ph Khnh tng hp, bin son v c Hi ng khoa hc tnh Khnh Ho nghim thu thng 4/1995.

* Bo co tng kt nghin cu khoa hc vi ti c im kh hu thu vn tnh Khnh Ho do i KTTV khu vc Nam Trung B kt hp vi S khoa hc cng ngh v mi trng tnh Khnh Ho thc hin v c thng qua thng 4/2003.



2.3.1.5. Ti liu thu vn

Lu vc tnh n tuyn cng trnh cha c ti liu o c thu vn, ln cn lu vc c cc trm thu vn nh (Sng Ch, ng Trng, Bn, Sui Du). Trong trm thu vn ng Trng l trm cp I o c t (1977 nay ), cc trm: Sng Ch, Bn, Sui Du do s thu li Khnh Ho xy dng, s liu ca cc trm ny cn thiu. Tuy nhin y l c s rt tt cho vic nghin cu tnh ton c trng thu vn cho cc lu vc thu in Khnh Thng, chi tit xem bng 1.2

Bng 2.14. Danh sch trm thu vn lu vc ln cn

To Yu t quan trc TT Tn trm Kinh V Q X H Trch l

Loi trm

1 Sng Ch 108o5407 12o2317 80 84 80 84 80 84

Dng ring

2 ng Trng 109o0043 12o1724 77 nay 77 nay

77 nay

83 nay

92 nay Cp I

3 Bn 109o0632 12o3809 77 83 77 nay 77,78,80,81

Dng ring

4 Sui Du 109o0411 12o1207 70,71,73-75,81,84 78-91

Dng ring

Trong : H - Mc nc bnh qun ngy Q - Lu lng bnh qun ngy X - Lng ma ngy ( thng ) - Hm lng ph sa

2.3.1.6. Ti liu kh tng v o ma

Ln cn lu vc tnh ton c 2 trm kh tng, 5 trm o ma, 2 trm kh tng ny c s dng phn tch qui lut bin i cc yu t kh hu trong vng v xc nh cc c trng kh tng cho tuyn cng trnh, chi tit xem bng 2.5.

Bng 2.15. Danh sch trm kh tng v trm o ma ln cn lu vc

To Yu t quan trc TT Tn trm

Kinh V X T Z U% Gi 1 Nha Trang 109o1151 12o1434 77 nay 77 nay 77 nay 77 nay 77 nay2 Mrak 108o4637 12o4146 77 nay 77 nay 77 nay 77 nay 77 nay3 Lt 108o2700 12o5707 77 nay 77 nay 77 nay 77 nay 77 nay4 Khnh Vnh 108o5309 12o1704 77 nay 5 Khnh Sn 108o5754 12o0126 78 nay 6 Cam Ranh 109o1044 12o0206 77 nay 7 a Chai 108o3509 12o0831 78 nay 8 Sui Vng 108o2502 12o0607 77 nay

Trong :



T- Nhit khng kh X - Lng ma ngy Z - Lng bc hi ngy U - m khng kh

S mng li trm kh tng thu vn, xem hnh 1.1 thuc tp 2.1: Thuyt minh kh tng thu vn.

2.3.2. c trng kh hu 2.3.2.1. Khi qut chung c im kh hu

c im kh hu ca lu vc mang c im kh hu Nam Trung B. c im quan trng v c o ca kh hu vng ny l tnh hnh kh hn cao. Trong ton b ch ma- m lin quan vi v tr che khut ca vng ny bi vng cung ni bao bc. Cc lung gi trong c hai ma th hin trong ch nhit, ma, m v nhiu yu t khc. Ma ma trn lu vc t thng IX n thng XII trng vi thi k thnh hnh ca gi ma. Cc thng IVIII Khnh Ho thi tit kh, i khi c ma.

Nhn chung lu vc thu in Khnh Thng nm trong vng kh hu nhit i c nhng nt c th ca kh hu vng Nam Trung B. 2.3.2.2. Nhit khng kh

S liu quan trc ti cc trm kh tng trn lu vc sng Ci ch ra rng ch nhit ca lu vc mang tnh cht ca vng nhit i pha Nam. Nhit trung bnh nm vo khong 26,70C (Nha Trang), 23,80C (Mrak). Chnh lch nhit gia thng nng nht v lnh nht l khng ln khong 60C. Trong khi bin dao ng nhit khng kh ngy m l ng k, c bit vo ma kh t ti trn 100C. Cc thng nng nht thng l cc thng IV, V, VI, cc thng lnh nht thng l cc thng XII v I.

Bng 2.16. Nhit khng kh trm Nha Trang v trm Mrak (oC)

Thng, nm

Tr

m

c trng I II III IV V VI VII VIII IX X XI XII Nm

Ttb 23,9 24,4 25,8 27,4 28,5 28,6 28,5 28,5 27,7 26,6 25,6 24,4 26,7 Tmax 27,0 27,8 29,4 31,0 32,4 32,6 32,5 32,5 31,6 29,8 28,3 26,9 32,6

Nha

Tra

ng

Tmin 21,4 21,9 23,1 24,7 25,5 25,6 25,5 25,5 24,8 24,1 23,4 22,1 21,4 Ttb 20,2 21,4 23,6 25,5 26,1 26,0 25,8 25,7 24,7 23,5 22,1 20,7 23,8

Tmax 29,4 32,6 34,6 35,8 35,0 33,7 33,4 33,2 32,6 31,3 29,5 27,7 35,8

M

rak

Tmin 14,4 15,2 16,1 18,7 20,4 20,6 20,0 20,6 20,1 18,9 17,4 15,4 14,4

2.3.2.3. m khng kh

m khng kh trung bnh nhiu nm vo khong 80%. Thi k tng i m l 3 thng ma ma c m trung bnh t t 82-85%. Thi k kh nht l cc thng cui ma ng, t thng I III m trung bnh vo khong 75-78%, m tuyt i thp c th xung di 50%.



Bng 2.17. m khng kh trm Mrak v Nha Trang (%)

Trm c trng I II III IV V VI VII VIII IX X XI XII Nm

Utb 87 85 81 80 80 79 78 78 85 89 90 90 84 MDrak

Umin 51 42 36 37 44 51 51 50 53 55 57 58 36 Utb 78 79 79 80 79 77 77 77 80 83 82 80 79 Nha

Trang Umin 42 35 41 41 37 33 35 35 33 42 47 46 33

2.3.2.4. Ch gi

Do s chia ct mnh m ca a hnh v hng ca cc dy ni cao, dn n lu vc Khnh Thng chu nh hng ca hai hng gi chnh thi ti, l hng gi ng v ng Bc, thng xut hin t thng X XI. Ln cn lu vc c trm kh tng Mrak nm cch tuyn p khong 30km theo hng Ty Bc, do vy s dng kt qu tnh ton t trm Mrak l gi tr thit k. Hoa gi xem hnh 2.1 ph lc, vn tc gi ln nht 8 hng ng vi tn sut thit k xem bng 2.3.

Bng 2.18. Tc gi ln nht 8 hng thit k (m/s)

Tn trm P% N NE E SE S SW W NW Vmax2% 17,1 16,9 16,4 18,0 17,1 23,3 39,0 26,7 40,2

4% 15,5 15,9 15,7 17,2 16,1 21,1 34,5 23,7 35,5 Mrak

50% 8,43 11,1 12,1 13,3 11,4 11,9 17,1 12,0 17,7

2.3.2.5. Ch ma

Lu vc thu in Khnh Thng nm trong vng a hnh khc bit, ton b lu vc c bao bc bi ni cao (8001453m). Hnh dng lu vc c dng hnh phu nghing dn v tuyn p, c hin tng ma trc ni. Cn c vo ti liu o c, qua phn tch theo khng gian thy c s bin ng ma theo a hnh rt ln. C th l, ti cc trm gip bin nh Nha Trang 1346mm, Cam Ranh 1250mm, ln trn khng xa v pha Ty lng ma tng t 200400mm nh trm ng Trng 1527mm, Khnh Sn 1702mm. c bit, nm cch lu vc Khnh Thng khong 20km v hng ng Nam c tm ma Hn B cao (1574m) lng ma trung bnh nhiu nm t 3627mm. Qua thy s phn b lng ma b nh hng ca a hnh l r rt. Ma l nhn t chnh to nn dng chy, i vi nhng lu vc cha c nghin cu nh lu vc Khnh Thng, vic xc nh lng ma l hng ng n nht cho vic tnh ton dng chy lu vc. V vy xc nh lng ma ph hp, ngoi s liu quan trc vng ln cn, cn phn tch k cc yu t a phng ca lu vc. Tnh lng ma bnh qun lu vc (X0) theo phng php bn ng tr. C s xc nh bn ng tr ma, cn c vo lng ma bnh qun nhiu nm ca cc trm o ma ln cn, cn c vo kt qu tnh ton phn tch s bin i ma theo a hnh.



Bng 2.19. Biu s liu ma tng theo cao ca cc trm ng Trng Sn- Nam Trung B

TT Tn trm Chui s

Cao so vi

mc nc bin (m)

Lng ma trung bnh nhiu nm

(mm)

Ghi ch

1 ng Trng 1977-2006 20 1465,4 Tnh ton 2 Khnh Vnh 1977-2006 40 1469,0 Tnh ton 3 Khnh Sn 1977-2006 600 1678,7 Thc o 4 Sui Du 1977-2006 10 1555,8 Tnh ton 5 Nha Trang 1977-2006 5 1324,9 Thc o 6 Tm ma Hn B 1977-2006 1574 3627,5 Tnh ton 7 Bn 1977-2006 20 1463,4 Thc o 8 Cam Ranh 1977-2006 10 1228,5 Tnh ton 9 Sng Ch 1977-2006 20 1688,7 Tnh ton

Ngoi ra xc nh ng ng tr ma hp l, bo co da vo bn ng tr ma t cc ti liu sau: - c im thu vn sng ngi Ph Khnh do i kh tng thu vn Ph Khnh

lp nm 1982. - c im kh hu thu vn tnh Khnh Ho do Trung tm kh tng thu vn

pha Nam lp nm 1995. - Bo co NCKH vi ti c im kh hu thu vn tnh Khnh Ho do i

KTTV khu vc Nam Trung B thc hin nm 2004. Bn ng tr ma lu vc thu din Khnh Thng, xem hnh 2.2 thuc tp

2.1: Thuyt minh kh tng thu vn. Phng php bn ng tr ma

Cng thc: F

fXX iio

= Trong :

X0 - lng ma bnh qun nhiu nm ca lu vc (mm) Xi - gi tr lng ma trung bnh ca hai ng ng tr k nhau (mm) fi - din tch thnh phn gia hai ng ng tr k nhau (km2) Kt qu Xo = 2300 (mm)

Phn ma: Qua phn tch ti liu mt s trm o ma trong vng, xc nh ma kh bt u t thng I IX, ma ma t thng X XII.



2.3.2.6. Ch bc hi

Theo ti liu quan trc trm Mrak, tng lng bc hi (Picher) bnh qun nhiu nm l 1244mm. Thi k bc hi ln nht t thng III n thng VIII lng bc hi t 120150 mm/thng. Thi k bc hi nh nht thng l t thng X n thng XII v ch t 5060 mm/thng.

Bng 2.20. Phn phi bc hi thng (Picher) nhiu nm trm Mrak (mm)

c trng I II III IV V VI VII VIII IX X XI XII nm Zpicher 73,8 87,3 128,2 135,6 122,9 136,1 151,8 151,0 92,9 59,4 50,8 54,4 1244

2.3.2.7. Lng tn tht bc hi

Bc hi mt nc c xc nh theo bc hi Picher trm Mrak (1978 2004) vi h s chuyn i l (k =1,1). Gi tr bc hi mt nc h cha l: Trnh t tnh ton Z(Picher) = 1244 (mm) K = 1,1 Zmn = k.Z (Picher) = 1368 (mm) Lng ma bnh qun lu vc Xo = 2300 (mm) Lp dng chy trung bnh nhiu nm Yo = 1455 (mm) (p chnh bc 1), Yo = 1455 (mm) (p chnh bc 2); Yo = 1462 (mm) (p ph bc 2). Lng bc hi lu vc Zo = Xo Yo = 845 ( mm )

Tn tht bc hi Z = Zmn Zo Bng 2.21. Phn phi tn tht bc hi h cha cho cc tuyn (mm)

Thng/Tuyn I II III IV V VI VII VIII IX X XI XII Nm

p chnh bc 1 31,0 36,7 54,0 57,1 51,7 57,3 63,9 63,6 39,1 25,0 21,4 22,9 524

p chnh bc 2 31,0 36,7 54,0 57,1 51,7 57,3 63,9 63,6 39,1 25,0 21,4 22,9

thuyet minh tkcs (xb).pdf

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