Homework 9
CEG 3011 Spring 2010
Soil Mechanics
Problem 1
The following Figure shows a soil profile. The uniformly distributed load on the ground
surface is
∆
σ
.
1.
Estimate the primary settlement of clay layer given these values
2.
How much consolidation will occur in 1 year if Cv = 0.0025m
2
/day
3.
How long will take for 0.1 m of consolidation to occur
H
1
= 1.5 m,
H
2
= 2.0 m,
H
3
= 2.5 m
Sand:
e = 0.62, G
s
= 2.62
Clay:
e = 0.98, G
s
= 2.75,
LL = 50
∆
σ
= 110 kN/m
2
∆
σ
Groundwater table
H
1
H
2
H
3
Clay
Void ratio = e
Normally consolidated
Sand
Sand
Sand
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Problem 2
If the clay layer in problem 1 is preconsolidated and the average preconsolidation
pressure is 80 kN/m
2
, what will be the expected primary consolidation settlement if
c
s
C
C
5
1
=
Problem 3
The following Figure shows a soil profile. The uniformly distributed load on the ground
surface is
∆
σ
.
4.
Estimate the primary settlement of clay layer given these values
5.
How much consolidation will occur in 1 year if Cv = 0.05m
2
/day
6.
How long will take for 0.1 m of consolidation to occur
H
1
= 1.5 m,
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 Spring '07
 staff
 5m, 10 m, 10M, 25 mm, 5 mm

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