负摩阻力
当桩周土体因某种原因发生下沉,其沉降变形大于桩身的沉降变形时,在桩侧表面的全部或一部分面积上将出现向下作用的摩阻力,称其为负摩阻力
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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