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A layer at 6 m depth has a factor of safety of 0.85 against liquefaction. The correct conclusion is that the layer

  • A.will liquefy only if the water table rises above its present recorded level
  • B.cannot be assessed without a laboratory cyclic triaxial test on an undisturbed sample
  • C.is expected to liquefy in the design earthquake
  • D.is safe

Answer: C

Correct answer: is expected to liquefy in the design earthquake

A factor of safety below one means the demand exceeds the resistance, so liquefaction is predicted and the consequences - settlement, loss of bearing, lateral spreading - must be assessed. The assessment does not need a laboratory test to reach that conclusion, and the water table is already in the calculation.

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