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Objective Question & Answer

QUESTION

Objective Question

Q.1
The time for a clay layer to achieve 90% consolidation is 20 years. The time required to achieve 90% consolidation in the clay layer of half thickness is
A
20 years
B
5 years
C
10 years
D
7.5 years
Answer ( Option B)

5 years

Solution

 According to Terzaghi's One-Dimensional Consolidation Theory, the time factor is given by:

 

 

Tv = Time factor

Cv= Coefficient of consolidation

 t = Time required for consolidation

Hd = Maximum drainage path length

For the same degree of consolidation (90%), the time factor remains constant.

Assuming the same soil properties and drainage conditions

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