IES-ESE (Engineering Services) Civil Engineering: Questions 1 of 185

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» Geo-Technical Engineering » Consolidation and Shearing Resistance

Appeared in Year: 2018

MCQ▾

Question

The theory of consolidation predicts settlement due to primary consolidation; it cannot include settlement due to initial compression nor due to secondary consolidation. This happens because of the following assumptions made in developing the theory:

1. Soil grains and water are incompressible

2. Soil is fully saturated

3. Compression takes place in the vertical direction only

4. Time lag in consolidation is entirely due to low permeability of soil

Which of the above statements are correct?

Choices

Choice (4) Response

a.

3 and 4 only

b.

1,2 and 4 only

c.

1,2 and 3 only

d.

1,2, 3 and 4

Answer

b.

Explanation

  • Soil grains and water are incompressible and soil is fully saturated are assumption which makes sure that initial compression is not taken in account.

  • Time lag in consolidation is entirely due to low permeability of soil which is reason that secondary consolidation can be neglected. (Time lag in consolidation is due to permeability of soil, so secondary consolidation is disregarded. )

  • Compression in vertical direction only do not have any relation with primary and secondary compression

  • Due to soil is fully saturated, water and solids are incompressible so initial compressor is negative.

  • Compression taking place in vertical direction is one of the assumption in Terzaghi’s one-dimensional theory. But it is not relevant for neglecting initial and secondary compression.

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