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Question

A layer of normally consolidated, saturated silty clay of 1.2 m thickness is subjected to one dimensional consolidation under a pressure increment of 25 kPa. The properties of the soil are: Specific gravity = 2.7. natural moisture content = 40% and compression index 0.45. The initial average effective stress within the layer is 125 kPa. Assuming Terzaghi s theory to be applicable, the primary consolidation settlement is mm


  1. 20.56

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Solution

The correct option is A 20.56

Primary consolidation settlement is given by,
ΔH=CcHc1+e0log10[¯¯¯¯¯σ0+Δ¯¯¯σ¯¯¯¯¯σ0]
Void ratio e0=wGS=0.40×2.71=1.08[ Soil is saturated]
ΔH=0.45×1.21+1.08log10[125+25125]
=0.02056m=20.56mm


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