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Flow Nets

Piping in soi...

Question

Piping in soil occurs when

A

the soil is highly porous

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B

sudden change in permeability occurs

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C

effective pressure becomes zero

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D

the soil is highly stratified

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Solution

The correct option is C effective pressure becomes zero
In case of upward seepage flow, if the upward seepage force becomes equal to the bouyant weight of soil, the effective stress in the soil becomes zero. This condition is called piping or quick sand condition or boiling of sand.

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