Time factor for a clay layer is

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BPSC AE Paper 5 (Civil) 14 Oct 2022 Official Paper
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  1. independent of thickness of clay layer
  2. a dimensionless parameter
  3. directly proportional to permeability of soil
  4. inversely proportional to drainage path

Answer (Detailed Solution Below)

Option 2 : a dimensionless parameter
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Detailed Solution

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Concept

The time required for any degree of consolidation can be obtained from Taylor's formula, it is a dimensionless parameter

T= Cv × t /d2

Where,

Cv = Coefficient of consolidation is constant for the same type of soils,

T= Time factor will also remain constant for the same degree of consolidation.

Thus, Time Factor depends on Coefficient of consolidation, Drainage path & Time.

Important Points

The time factor is given by,

For consolidation less than 60 %

For consolidation greater than 60 %

 

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