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A geotechnical report describes a layer as loose saturated silty sand at 4 m depth. The engineer should

  • A.carry out a liquefaction assessment for that layer
  • B.ignore the layer
  • C.assume the layer will liquefy and proceed straight to ground improvement
  • D.conclude that the site is safe because the layer lies more than three metres down

Answer: A

Every susceptibility criterion is met, so demand and resistance must be compared before anything is decided. Assuming the worst without assessment is as unhelpful as ignoring the layer, since ground improvement is expensive.

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