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Discussion

A soil is said to have fully liquefied when the excess pore pressure

  • A.falls to zero and the soil skeleton carries the whole of the total stress once more
  • B.becomes negative
  • C.equals the initial effective overburden stress
  • D.equals half of the initial effective overburden stress at that depth in the deposit

Answer: C

At that point the effective stress vanishes and the deposit has no frictional strength left, behaving as a heavy liquid. Partial pore pressure rise reduces the strength without destroying it, which is the more common condition.

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