考虑应力时空效应及桩体固结变形的复合地基固结解

Analytical Solution for Consolidation of Composite Ground Considering Consolidation Deformation of Pile and Time-space Effect of Stress

运用新的求解方法及解的表达形式,推导了考虑桩体固结变形、加载过程、附加应力非均布、扰动区土体渗透系数连续线性变换、地基径竖向渗流等复杂因素的一个较全面的散体材料桩复合地基固结解析解,并对解进行了分析、比较、验证.结果表明:本文解可以退化为瞬时加载条件下的解、不考虑应力随深度变换条件下的解以及Terzaghi一维固结解等已有解析解;地基底部附加应力越小,固结越快;不考虑桩体固结变形时地基固结比考虑桩体变形时快,桩径比越小,差异越明显.

A comprehensive analytical solution for consolidation of composite foundation with dispersed material piles was deduced by using a new solution method and the expression of the solution,which was taken into account the complicated factors such as consolidation deformation of pile,loading process, non-uniform distribution of additional stress,continuous linear transformation of soil permeability coefficient in disturbed zone,vertical seepage of foundation diameter,etc. The solution was analyzed,compared and verified. The results show that the solution presented in the new method can be reduced to the solution under instantaneous loading,the solution without considering the stress-depth transformation and the Terzaghi's one-dimensional consolidation solution,etc. The smaller the additional stress at the bottom of the foundation,the faster the consolidation.Without considering the consolidation deformation of pile,the consolidation of foundation is faster than that of pile,and the smaller the pile diameter ratio,the more obvious the difference is.