what is quick sand

Answer Posted / sag

When flow takes place in an upward direction , the seepage pressure also acts in upward direction and effective pressure is reduced. If seepage pressure becomes equal to the pressure due to the submerged weight of the soil , then effective pressure reduced to zero .in such case ,a cohesionless soil loses its shear strength , and the soil particles have the tendency to move up in the direction of flow .
This phenomenon of lifting of soil particles is called as quick condition or boiling condition or quick sand

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