Environmental Engineering Reference
In-Depth Information
0.8
0.7
0.6
C
m
D
m
G
s
de
d
(
wG
s
)
Slope =
=
0.5
Initial conditions
e
o
= 0.720
w
o
= 15.42%
0.4
Saturation line
e
=
wG
s
(
S
= 1.0)
0.3
0.2
Silt (dry of optimum)
direct measurements
0.1
0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
wG
s
Silt (dry of optimum)
w
o
= 15.4%
Till (dry of optimum)
w
o
= 15.2%
e
o
= 0.642
e
o
= 0.699
0.8
0.7
0.6
0.5
Silt (at optimum)
w
o
= 18.9%
o
= 0.606
Till (at optimum)
w
o
= 18.5%
o
= 0.567
0.4
e
0.3
e
0.2
0.1
0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
wG
s
Figure 13.76
SWCC obtained from pressure plate tests on silt
compacted dry of optimum water content (after Ho et al., 1992).
The SWCC for the silt (Fig. 13.76) was obtained using
pressure plate tests. The water content is multiplied by the
specific gravity
G
s
for the purpose of combining the void
ratio and water content plots, as illustrated in Fig. 13.71
(i.e., curve 4). The slope of the SWCC is equal to
D
m
G
s
.
The shrinkage curves for the compacted silt are shown in
Fig. 13.77. The void ratios corresponding to various water
Figure 13.77
Shrinkage test data for (a) compacted silt and (b)
compacted silts and glacial tills (from Ho, 1988).
Figure 13.78
Relationship of volume-mass versus stress state for silt compacted dry of optimum
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