Civil Engineering Reference
In-Depth Information
Figure 26.1
Formation of unsaturated soils.
Figure 26.2
Volumes and weights in unsaturated soils.
The degree of saturation
S
r
is defined as
V
w
V
w
S
r
=
(26.1)
+
V
a
so that for dry soil (
V
w
=
0)
S
r
=
0 and for saturated soil (
V
a
=
0)
S
r
=
1. The specific
volume
v
, the water content
w
and the unit weight
γ
are defined in the same way as
for saturated soil and they are given by
V
V
s
v
=
(26.2)
W
w
W
s
w
=
(26.3)
W
V
γ
=
(26.4)
