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The two conditions that must both be present for liquefaction are

  • A.a plastic clay soil and a deep water table at the site being considered
  • B.a dense gravel deposit and cyclic loading of a very large amplitude
  • C.an unsaturated silt and a high plasticity index in its fine fraction
  • D.a loose granular soil and saturation

Answer: D

Without the loose contractive skeleton there is nothing to generate the pressure, and without the water there is nothing to be pressurised. Cyclic loading of sufficient amplitude is the trigger that then acts on that combination.

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