双层超固结软黏土地基一维非线性固结分析  

Analysis on one-dimensional nonlinear double-layered over-consolidation soil foundation

作　　者：温介邦[1] 谢康和[1] 胡安峰[1] 

机构地区：[1]浙江大学岩土工程研究所,浙江杭州310027

出　　处：《水利学报》2007年第2期226-232,共7页Journal of Hydraulic Engineering

基　　金：国家教育部高校博士点基金项目(20030335027);浙江省自然科学基金项目(Y104413)

摘　　要：本文通过引入固结土层孔隙比与固结压力和渗透系数之间的非线性经验模型,建立双层超固结饱和软黏土地基非线性固结控制方程,并基于半解析法,编制了相应的计算程序。利用该程序,针对不同排水条件、变荷载、自重应力沿深度实际分布等条件分析双层超固结饱和软黏土地基一维非线性固结性状。计算结果表明,双层超固结软黏土地基比正常固结软黏土地基沉降小、固结发展快。荷载的大小、上下土层先期固结压力、土体压缩性和渗透性的变化等对双层地基的固结性状均有明显影响。The well known nonlinear empirical relationships between porosity and consolidation pressure, porosity and permeability coefficient are applied to establish the nonlinear consolidation governing equation for over-consolidation of double-layered saturated soft clay foundation. Based on the semi- analytical method, the relevant program ODNCADOS for computation is developed. By using this program the consolidation behaviors of the foundation for various drainage conditions, time dependent loadings and actual overburden pressure conditions are investigated. The calculation results show that the settlement and rate of consolidation will be greater if the effect of stress history is taken into account. The magnitude of load and the pre-consolidation pressure as well as the variations of compressibility and permeability of each layer will significantly affect the consolidation behaviors.

关 键 词：双层地基 超固结 非线性 半解析法 一维固结 

分 类 号：TU470[建筑科学—结构工程]