滑动土体与邻近桩基相互作用的弹塑性解

Elastoplastic solution for interaction between slipping soil and adjacent piles

基于Poulos理论和Winkler地基反力法,通过考虑关联性的土弹簧来模拟桩土相互作用,提出了滑动土体与邻近桩基相互作用的弹塑性解。将桩体在滑动面处分成被动和主动两部分,桩和周围土体相互作用通过p-δ和p-y曲线(p为桩身产生的压力,δ为桩-土相对位移,y为桩身位移)来模拟,采用侧向位移影响系数矩阵和巴氏模型分别考虑被动部分和主动部分土弹簧间的关联性,p-δ、p-y本构关系均采用理想弹塑性模型。工程算例分析表明,提出的方法与实测结果吻合较好,该方法应用于土体滑动条件下被动桩基的受力分析是可行的。

Based on Poulos theory and Winkler subgrade reaction method,the soil-pile interaction is realized through interrelational soil springs;and bending moment and deformation of passive pile is solved by the displacement compatibility differential equation obtained from finite difference method.The passive pile is divided into passive part and active part in the computation model;p-δ curves springs and p-y curves springs are adopted in the passive part and in the active part respectively;the matrix of soil-displacement factors and Pasternak model are used to consider the interrelation of soil springs;and ideal elastoplastic model is applied to p-δ and p-y curves.Finally,the practical calculation method is verified by a case study.