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These results are consistent with volume change measurements showing that,
even for a specimen compacted to the modified Proctor optimum water content and
maximum density, the relative change in void ratio remains below 1% when the
confining stress increases from 0 to 79 kPa [FLE 02a].
6.4.2.
Deviatoric compression paths
At the end of the isotropic compressions, consolidated undrained triaxial tests,
with measurement of the capillary pressure, were performed on the specimens under
the same confining stress of 79 kPa. The test results are shown in Figure 6.14.
600
2
3
1
3
400
1
6
11
2
4
7
8
10
9
2
200
0
11
10
9
8
1
6
7
4
0
-1
0
1 0
2 0
0
1 0
2 0
A x ial strain
ε
1
(%)
A x ial strain
ε
1
(kPa)
60
11
30
10
9
0
8
-30
7
-60
6
5
-90
0
1 0
2 0
A x i a l strain
ε
1
(kPa)
Figure 6.14.
Changes in stress deviator, volumetric strain and pore pressure versus axial
strain for consolidated undrained tests on Perafita sand [1: w=3.74%; 2: w=6.25%;
3: w=7.5%; 4: w=8%; 5: w=9.5%; 6: w=10%; 7: w=10.4%; 8: w=14.1%;
9: w=16.1%; 10: w= 17.9%; 11: w=18.3%]
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