被动单桩受轴向荷载作用耦合效应的初步分析

Couple Effect of Axial Load and Lateral Soil Movement Acting on a Passive Pile

桩基受到基坑开挖、地面堆载等引起的土体水平位移作用,导致桩身产生附加弯矩和位移,可能威胁桩基础的安全,这已成为工程界关注的一个重要问题。文章阐释了被动桩基的主要分析方法,分别基于Winkler地基模型以及非线性的p-y曲线法对土体侧移作用下的邻近桩基相互作用进行分析。并对桩顶受轴力作用的被动单桩进行了算例计算,初步分析了轴向荷载与土体侧移的耦合作用效应,计算结果表明,P-△效应的存在对既有桩基存在一定程度的不利影响。

Due to lateral soil movement resulting from excavations or surcharge loadings, the bending moments and displacements will act on adjacent pikes. The safety of the adjacent pike may be under threat. Therefore, the interaction of lateral soil movement and adjacent piles is becoming an important problem in practical engineering. The main methods to study behavior of passive piles are discussed and based on linear Winkled s model and nonlinear p - y method, the behavior of piles adjacent to lateral soil movement is analyzed as well. The effect of P - △, appearing when existing axial loads are applied to passive piles, is calculated and proved to be a possible inducement to the failure of piles.