1

3,730m

300m300m

H18.5

Determination of Design Shear Strength of Intermediate Soil in Sakai Port Using Unconfined Compression Strength and Triaxial CIU Strength

Takashi TSUCHIDA Osamu HORI

Takashi HANAOKA

6 9m 30CU

CU qu/2CU 10m 80

100

18km4km

8900

1)

10m10m

20m 20m

30m30m

40m 40m

50m50m

0m0m300m

N0 50

N0 50

N0 50

N0 50

－ 81 －

論文報告公益社団法人地盤工学会中国支部論文報告集

地盤と建設　Vol. 29, No. 1, 2011

－ 82 －

土田・保利・花岡

3

CU

CUCU

v0'•(1+2K0)/3 1202 K0

0.50.1 min

2 1su(SCU) CU su(SCU)

0.75 su(SCU) su(SCU)

0.75

qu su(qu) CU su(SCU)

su(qu) 0.80 su(SCU)

( )0.70su(SCU) <su(qu) 0.80 su(SCU)

( )0.60su(SCU) <su(qu)<0.70 su(SCU)

su(qu) 0.60 su(SCU)

CU

CU4),5),6)

31 CU qu/2 su(qu)

CU su(SCU)

su(qu) 0.80 su(SCU)

su(qu)

0.75 su(SCU)

qu su(qu)

0.80 su(SCU) su(qu) 0.70 su(SCU)

su(qu) 0.75 su(SCU)

0.70 su(SCU) su(qu) 0.60 su(SCU)

0.75 su(SCU)

su(qu) 0.60 su(SCU)

0.65su(SCU) 0.75 su(SCU)

20m

19 6)

3).4)

5)

5)

b1

0.1 1.00 1.00 0.1 0.15 0.95 1.05 0.15 0.25 0.90 1.10 0.25 0.40 0.85 1.15 0.40 0.60 0.75 1.25 0.60

－ 83 －

一軸圧縮強度と三軸CIU強度を用いた境港の中間土地盤の強度評価

4

×b1 (1)

b

0.1 b1=1.00.1

0.1 0.15b1=0.95

b1=1.05

-22m40% 40

40%40%

30 40%15 60

40

35

30

25

20

15

10

(m)

wL , wP, w0 (%)

Lp

0102030405060708090100

0 10 20 30 40 50 60 70

L(%)

(%)

L=30%

L=40%

0

10

20

30

40

50

60

70

0 10 20 30 40 50 60 70 80 90 100 110 120

I p

L(%)

A Ip=0.73(wL 20)

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

C c

wL (%)

Cc=0.015(wL 19)N.P.

－ 84 －

土田・保利・花岡

5

ACL( , ) A

CH( ,)

7)

505)

50%

N.P.( )10 12.9% 17.120.5% 26.2% 18.0% 48.1 2.7% 31.1% 57.9%,33.5%

50%

Cc

N.P.Cc

Cc = 0.015 (wL 19) (2)

(2)

8) Cc40% Cc 0.1 0.25

50(2)

cv

cv 500cm2/d N. P2,000 3,200cm2/d

qu/2 CU su(SCU) 75%0.75su(SCU)

0.75su(SCU) qu/2

2 7%CU

15%CU 2 4

CU

10

100

1,000

10,000

0 10 20 30 40 50 60 70 80 90 100

c v(cm

2 /d)

wL (%)

N.P.

40

35

30

25

20

15

10

(m)

qu/2 kN/

40

35

30

25

20

15

10

0 5 10 15

(m)

, f %

40

35

30

25

20

15

10

0 50 100 1500.75 su(SCU (kPa)

40

35

30

25

20

15

10

0 5 10 15

(m)

f (%)

qu/2 CU 0.75su(SCU)

－ 85 －

一軸圧縮強度と三軸CIU強度を用いた境港の中間土地盤の強度評価

6

CU

0

20

40

60

80

100

120

140

160

180

200

220

240

0 2 4 6 8 10 12 14

13(kPa)

(%)

CU ( 16.9m)

CU ( 18.4m)

( 16.9m)

( 18.4m)

L=26.5 30.9

0

20

40

60

80

100

120

140

160

180

200

0 2 4 6 8 10 12 14

13(kPa)

(%)

CU ( 17.4m)

CU ( 15.9m)

( 17.4m)

( 15.9m)

L=33.3 35.0

CU ( )

0

20

40

60

80

100

120

140

160

180

200

0 2 4 6 8 10 12 14

13(kPa)

(%)

CU ( 27.9m)

CU ( 26.4m)

( 27.9m)

( 26.4m)

L=72.9 74.9

0

20

40

60

80

100

120

140

160

180

200

0 2 4 6 8 10 12 14

13(kPa)

(%)

CU ( 29.4m)

CU ( 30.9m)

( 29.4m)

( 30.9m)

L=76.6 92.2

CU

0

20

40

60

80

100

120

0 20 40 60 80 100 120

,Su

(qu)

(kN/m

2 )

CU , Su(SCU) (kN/m2) 40

35

30

25

20

15

10

,z(m

)

Su(qu/2) 0.75 su(SCU) (kN/m2)

su(qu)0.75su(SCU) (0.75su(SCU) ( )

0.75su(SCU)=11.0 3.56z

0.75su(SCU)=8.6 1.72z

su(qu)=8.1 1.62z

su(qu) su(SCU) su(qu) 0.75su(SCU)

－ 86 －

土田・保利・花岡

7

CUCU

4% 2

3.0% 2

CU

su(qu) 3 qu

su=qu/2 su(SCU)

CU2 1

qu/2 su(qu) CU0.75su(SCU)

0.75su(SCU)

-1b1 (1)

0.75su(SCU)

qu/280 100

0.75su(SCU) 5%

40

35

30

25

20

15

100 20 40 60 80 100 120

,z(m

)

qu/2 0.75su(SCU) (kN/m2)

0.27b1=0.85

0.75su(SCU)=9.4 3.03z

0.22b1=0.90

su(qu)=7.3 1.46z

0.16b1=0.90

0.75su(SCU)=7.7 1.55z

su(qu) 0.75su(SCU)

H.H.W.L. +1.09mL.W.L. 0.07m

3.55m

+2.00m+1.00m

5.0m 1.5m 1.5m 4.5m

8.0m

8.0m

9.6m

7.5m

－ 87 －

一軸圧縮強度と三軸CIU強度を用いた境港の中間土地盤の強度評価

8

-16

0.75su(SCU)

qu/2

CUCU CU

75%1

(1) wL 3040%

20 65%

(2) CU

(3)

CIU75%

1) , (5 1 ),,

, 1994 2 .

2) , 3, pp.55-84, , 1992 .

3) , ,, Vol.41,pp.5-10,1993 .

4)Tsuchida, T. Evaluation of undrained shear strength of soft clay with consideration of sample quality, Soils and Foundations, Vol.40, No.3, pp.29-42, 2000.6.

5) , , ,,

, Vol.28, No.3, pp.81-145, 19896) ( ) ,

3 32 , pp.290-329. 2007 .

7) ,1972. 8)

17 3 1978.

(2011 6 27 )

－ 88 －

土田・保利・花岡