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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