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Well-graded soils are less susceptible to liquefaction than uniformly graded ones because they

  • A.contain a much larger proportion of plastic fines and therefore behave cohesively
  • B.are always found at greater depth
  • C.have a very much lower permeability and so drain considerably more slowly
  • D.pack more densely and contract less on shearing

Answer: D

Correct answer: pack more densely and contract less on shearing

A well-graded soil has small particles filling the voids between larger ones, so it is already close to its densest packing and has little room to contract further when sheared. Since the pore pressure rise comes from that tendency to contract, a well-graded deposit generates less of it than a uniform one of the same relative density.

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