671017.pdf

Table 1: Parameters used for calculation (퐼).

Figure no. 푛푎푠퐻/푑푤 푋푌푘푠/푘ℎ 푘ℎ/푘V 푘ℎ/푘V푤 푘ℎ푤/푘V푤

4 — 0.2 1.5 20 1000 10 0.6 2 0.001 1

5 4 0.2 1.5 — 1000 10 0.6 2 0.001 1

6 4 0.2 1.5 20 1000 10 0.2 2 0.001 1

7 4 — 1.5 20 — — 0.6 2 0.001 1

8 4 0.2 1.5 20 — — 0.2 2 0.001 1

9 4 0.2 1.5 20 1000 10 0.2 2 — 1

10 4 0.2 1.5 20 1000 10 — 2 0.001 1

11 4 0.2 1.5 20 1000 10 — 2 0.001 1

0. 
   


1. 2


2. 4


3. 6


4. 8


5. 0
   0.0001 0.001 0.01 0. 1110

Y = 20,X = 1000

Y = 20,X = 2000

Y = 10,X = 1000

Y = 10,X = 2000

Th

U

Figure 6: Influence of푋and푌on consolidation process.

0. 
   


1. 2


2. 4


3. 6


4. 8


5. 0
   0.0001 0.001 0.01 0. 1110
   Th

U

a=0,X =1,Y=1

a=0,X =1,Y=10

a=0. 2

a=0. 5

Figure 7: Influence of푎on consolidation process.

Figures 4 and 5 showtheinfluenceof푛and퐻/푑푤on
consolidation behaviour of CCSG pile composite foundation.
Itcanbeseenthatconsolidationvelocityisreducedwith
the increase of푛and퐻/푑푤. In other words, the bigger the
scope of influenced zone, the slower the consolidation rate
is.Figure 4also shows that the reducing rate of consolidation
velocity decreases with the increase of푛.
Figure 6shows the influence of푋and푌on the consol-
idation behaviour of CCSG pile composite foundation. As
shown in the figure, when the value of푌is constant, the

0. 
   


1. 2


2. 4


3. 6


4. 8


5. 0
   0.0001 0.001 0.01 0. 1110
   Th

kh/khw=0. 0001

kh/khw=0. 001

kh/khw=0. 01

kh/khw=1

U

Figure 8: Influence of푘ℎ/푘ℎ푤on consolidation process.

0. 
   


1. 2


2. 4


3. 6


4. 8


5. 0
   0.0001 0.001 0.01 0. 1110
   Th

U

ks/kh=0. 2

ks/kh=0. 4

ks/kh=0. 6

ks/kh=0. 8

Figure 9: Influence of푘푠/푘ℎon consolidation process.

consolidation rate increases with the value of푋.Similarly,

with푋constant, the larger the value of푌,thefasterthe

consolidation rate is. So, the consolidation rate should be

accelerated with the increasing of푋and푌.

Figure 7shows the comparison between several solutions,

including the solution for ordinary granular material pile

compositefoundationproposedbyLuetal.[ 26 ]andTerza-

ghi’s solution for natural foundation. When푎=0,푋=1,푌=

1 ,푘V=푘V푤,and푘ℎ=푘ℎ푤, the curve presents the changing of

consolidation degree with time for natural foundation. When