碎石桩复合地基复合模量取值分析

摘要

复合模量是计算复合地基沉降的关键参数,但求解出完全符合实际的精确解较困难。为此采用弹性理论中最小势能原理推求出复合模量上限值计算公式。此外,对影响复合模量上限值的几个主要参数如桩土压缩模量、土体泊松比、置换率等进行了分析,获得了一些定性的结论：上限值随着土体模量和置换率的增大而增大,复合模量取值应乘以1.1～1.4扩大系数。%The composite modulus of composite foundation is a key parameter in settlement calculations, but it is hard to obtain precise solutions that are completely conformed to reality. Based on the minimum potential energy principle, the calculation formula of the limit value of the composite modulus is obtained. Moreover, several factors which affect the limit value of the composite modulus such as compression modulus of pile and soil, Poisons＇ s ratio of so are obtained： the limit value should be multip replacement ratio are analyzed, and some qualitative conclusions value increases with soil modulus and replacement ratio, and the ied by 1.1 - 1.4 expansion coefficient.