Civil Engineering Reference
In-Depth Information
Fig. 12.1
Analogy of consolidation settlement.
Fig. 12.2
Forms of initial excess pore pressure.
(i) Soil is saturated and homogeneous.
(ii) The coefficient of permeability is constant.
(iii) Darcy's law of saturated flow applies.
(iv) The resulting compression is one dimensional.
(v) Water flows in one direction.
(vi) Volume changes are due solely to changes in void ratio, which are caused by corresponding changes
in effective stress.
The expression for flow in a saturated soil has been established in Chapter 2. The rate of volume change
in a cube of volume dx.dy.dz is:
∂
∂
h
x
2
∂
∂
2
h
y
∂
∂
2
h
z
k
+
k
+
k
dx dy dz
.
.
x
y
z
2
2
2
