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Liquefaction is generally not a concern at depths greater than about

  • A.0.5 m
  • B.20 m
  • C.2 m
  • D.200 m

Answer: B

Effective overburden stress grows with depth, and the cyclic stress needed to liquefy the soil grows with it, so deep deposits are rarely affected. The figure is a rule of thumb rather than a limit, and evaluation is normally carried out to that order of depth.

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