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Soil liquefaction describes a phenomenon whereby a saturated or partially saturated soil substantially loses strength and stiffness in response to an applied stress , usually earthquake shaking or other sudden change in stress condition, causing it to behave like a liquid. In soil mechanics , the term "liquefied" was first used by Allen Hazen  in reference to the failure of the Calaveras Dam in California. He described the mechanism of flow liquefaction of the embankment dam as follows:.
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