桩基设计中负摩阻力问题的探讨

Discuss on the negative frictional resistance in design of pile foundation

在软弱地基上、湿陷性黄土地区或有地震液化土地区建造建筑物，采用桩基础，将可能产生负摩阻力，使桩身发生破坏或使地基屈服破坏。因而了解负摩阻力产生的机理、条件及影响因素，探讨单桩及群桩设计中负摩阻力计算的方法对于搞好桩基设计尤为重要。

On the soft foundation or in collapsible the loess region or some place foundation may be liquefied due to earthquake, the piles should be used for foundation. But the negative frictional resistance may be appeared, which may destroy the piles and in turn causing the yield wreck of the foundation. Therefore, it is important to know the mechanism, conditions and influencing factors of the cause of negative frictional resistance, on which computation method used in single pile and piles design are demonstrated and discussed.