水平荷载下桩侧土体位移分布的弹性解及其工程应用

首先基于桩土共同工作理论推导出水平荷载作用下桩侧土体内的位移与应力径向分布的弹性解析解;然后,根据变形模量与位移的近似关系确定桩侧地基土体内的变形模量分布,并通过一定范围内的加权平均获得地基土的加权模量,再由有限层法获得地基加权刚度,由此可近似考虑土体的分层与非线性特征。在此基础上,用VB6.0编制出改进的水平受荷桩有限元—有限层计算程序。最后,结合某工程实例,采用所编制的程序讨论了不同桩侧地基土体变形模量分布模式对桩身内力分布的影响规律,对比分析结果表明,基于地基加权刚度的有限元—有限层法能更合理地分析水平受荷桩。

ANALYTICAL SOLUTIION OF THE ELASTIC DISPLACEMENT DISTRIBUTION IN THE SURROUNDING SOIL OF LATERALLY LOADED PILES AND ITS APPLICATION

An analytical elastic solution is derived to predict the displacement distribution in the surrounding soil of laterally loaded piles,taking into account the pile-soil interaction.Based on the empirical relationship between soil deformation modulus and displacement,the foundation modulus distribution around the pile is determined,and the weighted modulus obtained through weighted averaging with respect to a range of soil.By introducing the weighted foundation modulus to the finite element-finite layer method,the weighted foundation stiffness matrix is set up and a comguter code is developed to analyze the behavior of lateral loaded piles,in which the stratification and nonlinear characteristics of the subgrade are considered.The proposed method is applied to analyze the internal force and deformation of a test pile with different foundation modulus models.The result indicates that,the improved finite layer method using weighted foundation stiffness is more reasonable.