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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 these statements is/are correct?

A
1 only
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B
1 and 2
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C
2 and 3
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D
1 and 3
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Solution

The correct option is D 1 and 3
(d)
• As the effective stress increases, void ratio decreases. Hence permeability decreases.
• Entrapped air decreases the permeability of soil.
• Organic matter has the tendency to move towards flow channel and choke them. Thus the permeability is reduced.

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