静压桩终压力与极限承载力的差异分析

目前在上海及华东地区,对预制桩大都采用静力压桩方式将桩沉入地基中。将桩压入设计桩底标高时的最终压力值,一般认为即是该桩的极限承载力。其实这种看法是错误的。本文以实际工程为例,对＂终压力＂与＂桩极限承载力＂之间的差异,及其原因进行了分析。

Analysis of the Difference Between Final Pressure and Ultimate Bearing Capacity of Static Pile

The piles are mostly installed in the foundation by static pile pressing mode aiming at precast piles in Shanghai and East China currently. The final pressure value when the pile is pressed into the designed elevation at the bottom of the pile is generally considered as the ultimate bearing capacity of the pile. But in fact,this view is wrong. In this paper,the actual project is adopted as an example for analyzing the difference between‘final pressure＇and‘ultimate bearing capacity of the pile＇as well as the cause.