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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 1.16σ′0=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(σ′σ′0) ΔHH=Cc1+e0×log10(σ′σ′0) 30−2530=Cc1+0.54×log10(250150) Cc=1.16

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