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Plastic fines in a sandy soil

  • A.increase its susceptibility considerably by reducing the permeability of the deposit
  • B.have no effect whatever on whether the deposit is liable to liquefy under shaking
  • C.make the deposit liquefy at a much smaller number of loading cycles than clean sand
  • D.reduce its susceptibility to liquefaction

Answer: D

Cohesion between plastic particles resists the collapse of the skeleton, so plasticity index and liquid limit both appear in the criteria used to screen fine-grained soils. Non-plastic silt, by contrast, can be as susceptible as fine sand.

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