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e
e
max
0.8
0.7
0.6
e
min
p'
0.5
0.1
1
10
e
e
max
0.8
0.7
0.6
e
min
p'
cavitation
0.5
0.1
1
10
Figure 5.6.
Control of critical void ratio at plastic perfect state.
Drained and undrained tests after Mokham [MOK 83]
Let equation [5.14] be placed in the plane (
I
d
- log
p'
), where
I
d
is the density
index (which is what the consistence index is called for sands),
p'
being in kPa:
I
d
(CSL) = 0.52(log
p'
- 2)
[5.14]
The superposing of both perfect plastic models in the same plane shows just how
far we can take the analogy between clays, clean sands and granular materials (see
Figure 5.7). The very foundation of this analogy resides in the “granular” character
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