The possibility of quick sand condition will be there when flow of water to soil is :

Q. The possibility of quick sand condition will be there when flow of water to soil is :

A

Horizontal

B

Upwards

C

Downwards

D

None of the above

Solution:

The effective stress is reduced due to upward movement of flow of water. When the head causing upward flow is increased, a stage is reached when the effective stress is reduced to zero.
The condition so developed is known as quick sand condition.
Quick sand is not a type of sand or soil but a flow condition (hydraulic condition) occurring in cohesionless soils.
The discharge required to maintain a quick condition in a soil increases as the permeability of the soil increases.

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