路堤荷载下不排水端承桩复合地基固结分析

将复合地基视为均质复合材料,考虑桩土相互作用,建立了不排水端承桩复合地基固结方程,并给出复合地基固结度的解析解。通过与有限元法解答的对比,证明了此解析解的正确性和有效性。根据此解答对不排水端承桩复合地基固结性状进行了分析。研究发现,端承桩复合地基固结速率远大于天然地基,复合地基固结速率随置换率、桩土模量比的增加而增大,随加固深度的增加而减小。

Consolidation analysis of composite ground with undrained penetrating piles under embankment load

Soft ground improved by piles was treated as a homogeneous composite material.Consolidation equation for composite ground with undrained penetrating piles was established with consideration of mutual interaction between piles and surrounding soil.An analytical solution for consolidation degree of the composite ground was proposed.The validity of the proposed method was conformed through comparison among the present analytical solution and the finite element analysis and other existing analytical solutions.Consolidation characteristics of this kind of composite ground was investigated.It was shown that,based on the proposed analytical solution,the rate of consolidation of natural ground was much slower than that of the composite ground.The larger the values of replacement ratio and compression modulus ratio between piles and surrounding soil,the larger the rate of consolidation of the composite ground;and the larger the value of improved depth,the slower the rate of consolidation of the composite ground.