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Question

In a consolidation test, the thickness of saturated specimen of clay under over burden pressure of 150 kN/m2 is 30 mm at water content of 20%. On increasing the consolidation pressure to 250 kN/m2, the sample thickness decreases to 25 mm after consolidation. If specific gravity of clay is 2.7 the compression index of the clay.

A
1.16
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B
2.32
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C
5.98
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D
0.15
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Solution

The correct option is A 1.16
σ0=150 kN/m2

σ=250 kN/m2

H1=30 mm

w=20%
H2=25 mm
G=2.1
Cc=?

e0 Sr=w.G

e0=0.2×2.7

e0=0.54

ΔHH=Δe1+e0

Cc=Δelog10(σσ0)

ΔHH=Cc1+e0×log10(σσ0)

302530=Cc1+0.54×log10(250150)

Cc=1.16

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