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The correlation of the compression index
C
c
of clay with Atterberg values are
demonstrated by various authors
C
c
= a
(
c
-
b
)
(2.2)
a
b
c
a
b
c
Terzaghi and Peck
(normal clay)
0.009
10
w
l
Schofield and Wroth
1.325
0.0
I
p
Skempton
(remoulded clay)
0.007
7
w
l
Nishida
0.54
0.35
e
0
Hough
0.01
9.2
w
Rendon-Herrero
0.30
0.27
e
0
Azzouz
0.01
5
w
Two practical correlations between the liquidity index and the undrained shear
strength
c
u
(Wroth and Wood) and the internal friction angle
(Jamiolkowski et
al.) are shown in Fig 2.3.
kPa
c
u
1
o
2
40
5
10
30
20
50
20
100
I
l
I
l
200
10
0 0.25 0.5 0.75 1 1.25
0 0.2 0.4 0.6 0.8 1.0
(a) (b)
Figure 2.3 Empirical correlations
(a) flocculated (salty) (b) non-flocculated (fresh) (c) remoulded (dispersed)
Figure 2.4 Schematic soil structures
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