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towards a peak that shows a maximum sensitivity of
S
t
= 8.5, then gradually tends
towards the remolded sediment behavior with
S
t
= 1.
This study shows that Burland's ICL better reflects the experimental results and
represents the compressibility for a large range of
w
L
. On the other hand, the NCRS
line in the Biarez model is less well adapted to high values of
w
L
, but remains valid
for representing compressibility in the case of medium and low values of
w
L
. The
NCRS line also has the advantage of being simpler to use because it is based on two
current “nature parameters”: the Atterberg limits
w
L
and
w
P
.
σ
'
v
/
σ
'
v
*
e
σ
'
v
/
σ
'
v
*
e
Beginning of damage of the
cementation
début de la destruction
de la cimentation
10
10
σ
'
y
/
σ
'
ve
*
= 8,5
9
8
8
(b)
(a)
7
6
6
4
5
4
2
Remolded state
α
=0,051
état remanié
0
3
1 . 52 . 53 . 5
e
2
Remolded state
état remanié
1
-20
20
60
100
-40
0
40
80
120
IL
Figure 5.22.
Evolution of cementation damage in the GoG sediment
5.11. Conclusion
It has been shown by Biarez that non-cohesive granular materials, such as the
clean sands and the remolded clays studied in this chapter, behave similarly in the
large strain domain. The same can be said for the critical state line, isotropic loading
paths, the over-consolidation concept, drained and undrained triaxial test paths. As
an analogy to the above, we have also found a similar behavior between loose sands
with or without lumps and deep sea marine clays with low physico-chemical
cohesion. It was certainly his vision of sands and clays as “granular materials”
(Biarez often referred to clay as “
les paquets de plaquettes
”, i.e. particle clusters)
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