Geoscience Reference
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292
Multiscale Geomechanics
Figure 9.16.
Methodology to identify model parameters for clays [LOP 07]
current applications. The second is to provide a rapid way to verify the coherence of
data from a series of geotechnical tests.
This methodology is operational for clays and sands. Therefore, with a minimum
amount of data, we can define the first set of usable parameters. A summary of this
methodology applied to clays is given in Figure 9.16. The response of a clay under
a given stress-path is defined by two categories of information. The first category
corresponds to the determination of its initial state and its loading history. The second
category corresponds to its proper behavior.
For a normally consolidated clay, knowing the initial void ratio and
w
L
is sufficient
for determining the rest of the parameters. As can be seen in Figure 9.16, we dispose of
correlations for almost all the model parameters (
φ
,
G
max
,
β
,
E
p
(or
a
1
and
a
2
),
p
c
0
,
behavior domains). Only a few parameters remain for which the correlations have not
yet been validated and tested (
b
).
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