...桩相对于土体产生向下的位移时,土表现为对桩的支承作用,产生正摩擦力(Positive Friction);反之,产生负摩阻力(Negative Friction),其分界点称之为中性点。负摩阻力的产生增加了桩身负荷,使承
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湿陷性黄土地区地基土浸水湿陷后，桩侧表面可能产生负摩阻力，将导致桩基承载力降低。
The negative skin friction resistance caused by collapsible deformation after water soaking into collapsible loess will reduce the vertical bearing capacity of piles.
实例分析表明，由于桩侧负摩阻力的影响，单桩承载力大为降低。产生负摩阻力的土层，不宜采用端承型桩基。
The greatly reduced capacity of a single pile resulting from the negative friction leaves the end-bearing pile unsuitable in the backfilling soil.
阐述了桥梁桩基负摩阻力产生的原因，分析了桩基中性点位置确定、负摩阻力计算等问题，并提出了十条有效减少负摩阻力的措施。
This paper expatiates on the causes of negative frictional resistance which may appear on bridge piles, analyses the calculation methods and gives ten methods reducing it.
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