*C TRNG HP L CA VA PHUN TRONG VIC HN CH LN ST B MT KHI THI CNG TUYN METRO S 1, S DNG MY O TUNNEL BORING MACHINE (TBM) TRONG KHU VC T YU CA TP.HCM

KS. NGUYN TNG THANH BNH15-01-2011B mn Cu ngKhoa K Thut Xy DngTrng i Hc Bch Khoa Tp. H Ch Minh

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*NI DUNGNGHIN CU TNG QUANNG LC NGHIN CUMC TIU NGHIN CUGI THIT NGHIN CUPHNG PHP NGHIN CUVT LIU NGHIN CUKT QUPhn tch ln b mt cha c jet-groutingGii php S dng jet-groutingKT LUN V KIN NGH

* NGHIN CU TNG QUAN

ln b mt do thi cng hm c nhiu tc gi nghin cu v xut cng thc tnh ton ln b mt nh hng n n nh ca cc cng trnh bn trnC nhiu gii php c xut gim ln nyJet-grouting c s dng ph binHiu qu s dng jet-grouting ph thuc vo nhiu yu t

* NG LC NGHIN CU

ln b mt do thi cng hm gy h hi cc cng trnh bn trn.

Ti khu vc Nh ht thnh ph, ch cho php ln b mt ti a 1cm.

Cc nghin cu ng dng jet-grouting cho cac tuyn hm nc ta cha c ph bin, c bit i vi a cht ca thnh ph H Ch Minh.

* MC TIU NGHIN CU

Tm hiu v tnh ton ln b mt cho tuyn Metro s 1 khu vc Nh ht thnh ph.

Cc c trng ca jet-grouting (modul n hi E v b dy kt cu ) nh hng n ln b mt.

* GI THIT NGHIN CU

Xem nh vt liu t v va phun lm vic theo m hnh Morh CoulombXem vic thi cng va phun l l tngVa t cng ti thi im ang xtBo qua cac tai trong trn b mt

*PHNG PHP NGHIN CUHm Gauss c s dng tng ng trng ln b mtTrong :S ln b mt t nn (m)y khong cch ngang tnh t tm ng hm(m)(Peck 1969)Trong Smax c tnh theo 3 trng hp:

Theo HerzogTheo OReillyTheo FEM

* PHNG PHP NGHIN CU

Theo Herzog 1985:Trong :Smax ln ln nht ti b mt t nn (m) - l khi lng ring trung bnh ca cc lp t (tn/m3)Zo su t hm tnh t mt t n tim hm (m)Ps - ti trng cht thm (tn/m)D - ng knh v hm (m)E - modul n hi trung bnh t nn (tn/m2)i - khong cch t tim hm n im un ca ng cong Grauss (m)VL Th tch mt mt t tnh cho 1 mt di (%)Phn t hu hn (FEM), s dng Plaxis 2D. Theo OReilly 1991:

*VT LIU NGHIN CU

S dng cc thng s ca tuyn hm v a cht ti v tr Nh ht thnh ph. c trng va phun s dng trong nghin cu c thay i bao gm: Modul n hi E dao ng t 100 MPa n 5000 MPa. Kch thc hnh hc ca va phun t 0.5 m n 3.5 m.

* VT LIU NGHIN CU

*KT QU TNH TON

*KT QU TNH TON

VL%SmaxmHm trnHm diHerzogO'ReillyFEMHerzogO'ReillyFEM0.350.0080.4670.00400.0040.2600.00411.80.0422.4000.03803.50.0452.6030.0500

*S dng jet-grouting

Tnh ton vi VL =0.5 % KT QU TNH TONSo snh kt qu nghin cu:Tan & Ranjith s dng cc ng thp (E=70GPa), cho hiu qu gim ln b mt 40-50%Nghin cu ny (vi E=5GPa), gim c 37% ln b mt

*Xc nh cc c trng jet-grouting tng ng vi ln yu cuNG DNGiu kin s dng va thc t trong nc nm trong phm vi sau:ng knh ct va khon 0.8 mModul vo khong [300;1000] MPa

* ln b mt ph thuc vo chiu su t hm. ln b mt tng theo tng ca VLCng va phun v b dy ca kt cu jet-grouting nh hng ln n ln b mt. a cht thnh ph H Ch Minh, ln b mt gim mnh khi E nm trong [200, 1000] MPaKT LUN

*S dng m hnh Cam Clay Thay i s kt cu vaPhn tch bi ton c k n qu trnh thi cng jet-grouting Kt hp s liu quan trc trong thi cng KIN NGH

*Bi bo c vit li t nghin cu ny mang tn:The characteristics of jet grouting to reduce ground surface settlement during the metro No. 1 constructed using Tunnel Boring Machine (TBM) in Ho Chi Minh city, Vietnam

Chun b gi i ng k tham d Hi tho The World Comgress on Engineering (WCE) d nh t chc London thng 07 nm 2011.BI BO KHOA HOC

*TS. TRN NGUYN HONG HNGPGS. TS. L VN NAMThS. L VN CNGTS. V XUN HOTS. L B KHNHTS. TRN TUN ANHPGS. TS. L TH BCH THUCc bn b, ng nghip v gia nhLI CM N

*Almer, E. C. (2001). "Grouting for Pile Foundation Improvement." PhD Thesis at Delft University of technology.Bzowka (2004). "Computational model for jet-grouting pile-soil interaction." Studia Geotechnica et Mechanica, Polan XXVI(3-4).Coulter, S. and C. D. Martin (2006). "Effect of jet-grouting on surface settlements above the Aeschertunnel, Switzerland." Tunnelling and Underground Space Technology 21(5): 542-553.Glossop, N. H. and M. P. O'Reilly (1982). "Settlement caused by tunnelling through soft marine silty clay." V 14(N 9): 13-16.ITA-AITES, W. R. (2007). "Settlements induced by tunneling in Soft Ground." Tunnelling and Underground Space Technology 22(2): 119-149.Kasper, T. and G. Meschke (2006). "A numerical study of the effect of soil and grout material properties and cover depth in shield tunnelling." Computers and Geotechnics 33(4-5): 234-247.Kasper, T. and G. Meschke (2006). "On the influence of face pressure, grouting pressure and TBM design in soft ground tunnelling." Tunnelling and Underground Space Technology 21(2): 160-171.Mair, R. J., M. J. Gunn, et al. (1981). "Ground movements around Shallow tunnels in soft clay." Proceedings of the International Conference on Soil Mechanics and Foundation Engineering 1: 323-328.O'Reilly, M. P. and B. M. New (1982). Settlement aboved tunnels in the United Kingdom - Their magnitude and prediction, Brighton, Engl, Inst of Mining & Metallurgy.Peck, R. B. (1969). "Deep excavations and tunnelling in soft ground." The 7th International Conference Soil Mesh, Mexico City, State of the art 3: 225-290.Tan, W. L. and P. G. Ranjith (2003). "Numerical analysis of pipe group reinforcement in soft ground tunnelling." 16th International Conference.Toan, N. D. (2006). "TBM and Lining -Essential Interface " Master of Science, COREP, Turin, Italy.Van, C. L. (2009). "Ln st do thi cng hm bng TBM v kim sot khi thi cng." Tp ch a K Thut 3.Van, C. L., G. Leoutssakos, et al. (2008). "Athens Metro - Elliniko Extension TBM Tunnel Construction." Magazine Geomechnics and Tunnelling(3): 197-206.TI LiU THAM KHO

*CU HICU HI?

*XIN CM NXIN CM N S CH THEO DI

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