Geoscience Reference
In-Depth Information
between 40 kPa and 1000 kPa. Normalization by means of the I V parameter and
*
1000
P e = mption are, of course, fundamental in this result because they force
the NCRS to have the ( I v = -1, σ ' v = 1,000 kPa) point on the ICL. However, in the
stress range below 40 kPa, the two lines diverge slightly due to the concavity of the
curves (Figure 5.19a), which is taken into account in the ICL expression. Both
approaches may, therefore, be summarized in Table 5.2, with the
an e e
indices for “Biarez in Burland's space” being deduced from both interpolation [5.33]
and relations [5.2] to [5.5], considering
*
*
100
1000
P e = and
*
1000
L e = .
*
6.5
Burland's model
Biarez's model
Mixted model
3
I
=
0.46 3 log '
σ
Equation
=
2.45
1.285 log '
σ
+
0.015 (log ' )
σ
=−
2log'
σ
V
L
v
V
*
6.5
*
100
*
1000
=
L
ww
ww
=
*
2
3
=
0.109
+
0.679
0.089
+
0.016
Characteristic
points
100
*
L
L
L
6.5
L
=
0.60
+
0.14
L
=
0.149 0.423
+
0.089
2
+
0.016
3
=
1000
L
L
L
1000
P
=
0.27
+
0.26
L
Estimation of
compression
index
C
*
=
0.256
0.04
Cc
=
0.009
w
13
*
CC
==
0.33
e
0.12
L
L
L
Table 5.2. Characteristics of the models
ICL line (Burland, 1990)
NCRS (Biarez &Favre, 1975-1977)
NCRSa(s-m)
(expressed for marine sediments)
NCRSa(k)
( expressed for kaolinite P300)
ordometric path
(KaoliniteP300)
oedometric path
(marine sediments z=16.5m)
oedométric path (z=9,5m)
(marine sediments)
180
2.5
IL (%)
I v
NCRS a (k)
160
ICL
2
140
-b-
1.5
120
-a-
NCRS
ICL(k)
100
1
ICL(m-s)
80
0.5
NCRS
60
0
40
NCRS a (m-s)
20
-0.5
0
-1
-20
-1.5
-40
1
10
100
1000
1
10
100
1000
σ ' v (kPa)
σ ' v (kPa)
Figure 5.21. Comparison between the two statistical models for the one dimensional
loading in ( σ ' v ,I v ) and ( σ ' v ,I L ) planes
Search WWH ::




Custom Search