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Question
Consider the following statements :
1. Permeability of a soil decreases as the effective stress acting on the soil increases.
2. The presence of organic matter in the soil increases its permeability.
3. Entrapped air decreases the permeability of a soil.
Which of the above statements is/are correct?
A.
1 only
B.
1 and 2
C.
2 and 3
D.
1 and 3
Answer ( Option D)

1 and 3

Solution

 (i) As effective stress increases, void ratio decreases. Hence, permeability decreases.
(ii) Organic matter has the tendency to move towards flow channel and choke them, thus reduces permeability.
(iii) Entrapped air decreases the permeability of soil.

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