变荷载条件下考虑土体非线性的碎石桩复合地基固结研究

摘要

在合理假设的基础上,推导出变荷载条件下考虑土体非线性的碎石桩复合地基固结度解析解.此解析解可退化至经典的一维太沙基固结解,证明推导出的固结度解析解是正确.以此解析解为基础,研究了碎石桩半径、碎石桩渗透系数、桩土模量比、软土渗透指数、软土压缩指数、加载时间对复合地基固结速率的影响.研究结果可用于碎石桩复合地基的设计和施工.%Based on the reasonable assumptions,an analytical solution on consolidation degree of gravel pile composite foundation considering soil nonlinearity under variable load conditions is deduced.The analytical solution can be reduced to the classical one-dimensional Terzaghi consolidation solution,which is proven that the analytical solution is correct.By using the analytical solution,the influence of gravel pile radius,gravel pile permeability coefficient,pile-soil modulus ratio,soft soil permeability index,soft soil compression index and loading time on consolidation rate of composite foundation are researched.The results can be used in the design and construction of gravel pile composite foundation.