变荷载下散体材料桩复合地基固结研究  

Consolidation of composite ground with granular columns under time-dependent loading

作　　者：张玉国[1] 海然[1] 谢康和[2] 

机构地区：[1]中原工学院土木建筑工程系,河南郑州450007 [2]浙江大学岩土工程研究所,浙江杭州310027

出　　处：《岩土工程学报》2009年第6期939-945,共7页Chinese Journal of Geotechnical Engineering

基　　金：河南省教育厅自然科学研究项目(2007560021);河南省教育厅自然科学研究项目(2008A560016);河南省重点科技攻关计划(072102230029)

摘　　要：研究了复合地基固结问题,给出了变荷载及排水影响区土体内水平向渗透系数沿径向任意变化情况下散体材料桩复合地基固结一般解,讨论了复合地基固结特性。研究表明,水平向渗透系数和加载速率对复合地基固结有重要影响。加载越快,复合地基固结越快,瞬时加载时固结最快;加载越慢,桩径比(n)、扰动区大小(s)和施工扰动程度(ks/kh)对复合地基固结的影响会逐渐减弱。A general analytical solution is given to the consolidation problem for the composite ground with granular columns under time-dependent loading and arbitrary variation of horizontal permeability coefficient in the soil of drain influence zone with radial distance. Based on the solution, the consolidation behavior of the composite ground is discussed. It is shown that the consolidation process of the composite ground is much more affected by both horizontal permeability coefficient and loading rate. The faster the loading rate is, the faster the consolidation is, and the one under instantaneous loading the fastest. The slower the loading is, the less the effect of n, s and ks/kh on the consolidation process of the composite ground with granular columns is.

关 键 词：散体材料桩复合地基 固结 变荷载 水平向渗透系数 施工扰动 解析解 

分 类 号：TU441.8[建筑科学—岩土工程]