褥垫层对刚性桩复合地基影响的数值模拟分析

在桩土复合地基中，褥垫层起着动态调节桩土应力比的作用，决定着整个体系的承载能力。本文基于某高速公路北延线佛山段路基工程条件，运用Plaxis有限元软件对褥垫层进行数值模拟研究，从褥垫层的作用角度分析褥垫层厚度和弹性模量的参数变化对复合地基的影响。明确有限元计算目的和方法，介绍Plaxis程序，给出有限元计算模型的建立过程，确定有限元计算方案，从变形和应力的角度分析褥垫层厚度和弹性模量参数变化对桩土复合地基的影响。

Analysis on Numerical Simulation of the Influence of Cushion on Rigid Pile Composite Subgrade

In the pile-soil composite subgrade, the cushion dynamically adjusts the pile-soil stress ratio and determines the bearing capacity of the entire system. Based on the engineering conditions of the Foshan section of the northern extension of an Expressway, this paper intends to use the Plaxis finite element software to conduct a numerical simulation study on the cushion and analyze the influence of parameter variation of cushion thickness and elastic modulus on composite foundation from the perspective of cushion action. This article clarifies the purpose and method of finite element calculation, introduces the Plaxis program, gives the establishment process of the finite element calculation model, determines the finite element calculation scheme and analyzes the parameter variation of cushion thickness and elastic modulus on the pile-soil composite foundation from the perspective of deformation and stress.