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The soil most susceptible to liquefaction is

  • A.unsaturated silty soil well above the level of the water table
  • B.loose saturated fine sand
  • C.stiff over-consolidated clay of high plasticity below the water table
  • D.dense well-graded gravel with free drainage in every direction

Answer: B

Uniform loose sand below the water table contracts readily under cyclic shear and drains too slowly for the pressure to dissipate. Plastic clays resist because of their cohesion, gravels because they drain, and dry soils because there is no pore water to pressurise.

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