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Liquefaction requires the soil to be

  • A.unsaturated so that air can be compressed within the pores of the soil
  • B.completely dry so that no pore water pressure can develop within the deposit
  • C.frozen so that the ice within the pores can transmit the cyclic shearing
  • D.saturated

Answer: D

Excess pore water pressure is the mechanism, so there must be water in the pores with no quick escape route. Deposits above the water table are therefore not susceptible, which is why the depth to groundwater is one of the first things checked.

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