Which of these best describes what liquefaction does to a soil deposit?
Answer: C
For a period of seconds to minutes the deposit has no effective stress and no frictional strength, which is why buildings sink and buried tanks float. It regains strength as the pressure dissipates, leaving a denser and lower ground surface.
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The two conditions that must both be present for liquefaction are
Answer: D
Without the loose contractive skeleton there is nothing to generate the pressure, and without the water there is nothing to be pressurised. Cyclic loading of sufficient amplitude is the trigger that then acts on that combination.
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A geotechnical report describes a layer as loose saturated silty sand at 4 m depth. The engineer should
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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