1

2009

20101),2)

PBD 3)

1

2 2009 40m×60m 20m×20m

2010 50m×200m3 2009

2010 5m

PBD 4

PBD PBD 94mm× 3.9mm

39mm

8 10 PBD 1

200m 1

3

Asc Ac2

PBD 1.0m

2010 200m

4 4 -60kN/m2

Execution for volume reduction of soft ground using both snow weight and vacuum (Part.1):

H.Shinsha & S. Shiraga (Vacuum Consolidation Drain Association)

50m

5m

PBD(50 200m)

30m1 1

40m

50m

5m

PBD(40 60m)

1 1

20102009

Ap

AsAsc

Ac2

3.1m1.0m1.8m

11.4m

6.0m

10.5m

Ac1,Ap1

As1-2

Asc

Ac2

2.0m

1.8m

1.9m

8.0m

5.1m

7.4m

2

2009 5m

0.6m 33kN/m2

1 2

0.55g/cm3 0.30g/cm3

0.48 0.55 g/cm3

1 0.6m 2

0.5m 10 5m

0.5m

0.72g/cm3 0.104 g/cm3

1 1 3

2010 0.60 g/cm3 0.7m3

1 1m D65

62kN/m2

2009

4

(1)

(2) 2009 1 0.6

2 2009

0.72g/cm3 2010

0.60 g/cm3

1)

Vol.6,No.3 pp.427 438 2011. 2) 1

2 67 pp.303 306 2012. 3) 2010.

t g/cm3

0.2990.4840.5520.6030.525

2 0.548 70cm 60cm4 0.550 60cm 55cm6 0.5518 0.550

-1-2

+

2009 2010

(Ap)

(Ac2) 5m 1 2009

( 40m×60m)1) 2010

( 50m×200m)

PBD 1.0m

-60kN/m2 FEM (

Dacsar)

12)

2009 2010

2 2009 6.0m

10.5m 2010

5.1m 7.4m

ASC Ac2

2009 2010 FEM

3 4

1 2009 Ap

Ac2 Cam -Clay As Asc

As

-5 -15

25cm

0 2010 Ap1 Ac1

Asc Ac2 ( ) As1-2

2009 t 7.0kN/m3

(JIS A 1106) E=90KN/m2 2010 t=6.0kN/m3

E=7KN/m2

(2) 2009 5 2010 6

2009 79.0cm 2010 56.2cm 5 6

2009 7 2010 8

50m

5m

PBD(50 200m)

30m1 1

40m

50m

5m

PBD(40 60m)

1 1

G.L.-16.5m )50.0m

(25cm)

40.0m

Ap (3.1m)

Ac2 (11.4m)

As (2.8m)

Execution for volume reduction of soft ground using both snow weight and vacuum (Part.2), H. Shinsha & S. Shiraga

(Vacuum Consolidation Drain Association)

2009

Ap

AsAsc

Ac2

3.1m1.0m1.8m

11.4m

6.0m

10.5m

2010

Ac1,Ap1

As1-2

Asc

Ac2

2.0m

1.8m

1.9m

8.0m

5.1m

7.4m

Ac2 (8.0m) Asc (1.9m)40.0m G.L.-12.5m

As1-2 (1.8m) Ap1,Ac1 (2.0m)

7 8

2009

1 E 5MN/m2 2

E 90MN/m2( ) 3 E

90MN/m2 9

2009 2010

FEM

(1) ( ) FEM

(2)1) Vol.6 No.3 pp.427 438 2011. 2)

( 1) 53

-0.2

0.0

0.2

0.4

0.6

0.8

1.0

1.2

-80 -70 -60 -50 -40 -30 -20 -10 0 10 20 30 40

L m

FEM

0.0

0.2

0.4

0.6

0.8

1.0

0 10 20 30 40 50 60 70 80 90

S(m

t day

FEM

92

2009

e t(kN/m2) k(m/sec)

Ap-1 8.77 9.0 2.04 0.204 1.8 1 10-3

Ap-2 7.47 11.0 1.81 0.181 1.8 1 10-3

As - 18.0 1 10-3

Ac2-1 1.59 16.0 0.26 0.026 1.2 1 10-5

Ac2-2 1.94 16.0 0.36 0.036 1.2 1 10-6

Ac2-3 1.78 16.0 0.41 0.041 1.2 1 10-6

11.0 1 10-3

7.0 1 10-3

E(MN/m2)=2.8

E(MN/m2)=90.0

0.333

E(MN/m2)=90.0

0.0

0.2

0.4

0.6

0.8

1.0

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140t day

FEM

140

-0.2

0.0

0.2

0.4

0.6

0.8

1.0

1.2

-80 -70 -60 -50 -40 -30 -20 -10 0 10 20 30 40

FEM

L (m)

2010

e t(kN/m2) k (m/sec)

Ac-1,Ap-1 2.305 14.5 0.29 0.029 1.2 1.27×10-8

As1-1 - 18.0 1 10-6

Asc 1.177 17.6 0.15 0.015 1.2 2.61×10-8

Ac2 1.775 16.0 0.36 0.036 1.2 5.73×10-10

- 6.0 1 10-6

0.33

E(MN/m2)=16.0

E(MN/m2)=7.0

-2.5

-2.0

-1.5

-1.0

-0.5

0.0

0.5 30 45 60 75 90 105 120

Sm

123

L m