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Question

The initial pore water pressure at a point A in a clay layer was 10 kPa. A surcharge of 15 kN/m2 was placed on Ground surface. The excess pore water pressure at beginning and end of the consolidation of clay layer are (in kN/m2)

A
15 and 0
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B
25 and 15
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C
25 and 0
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D
25 and 10
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Solution

The correct option is A 15 and 0
Increase in vertical stress =Δ¯σ=15kPa

Initial excess pore water pressure =Δu=15kpa

This dissipates and becomes zero at end

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