基于孔隙介质特征的地基沉降分层总和分析方法  

Layer-wise Summation Analysis Method for Settlement of Ground Foundation Based on Porous Medium Features

作　　者：曹文贵[1] 李鹏[1] 唐旖旎[1] 贺敏[1] 

机构地区：[1]湖南大学岩土工程研究所,湖南长沙410082

出　　处：《中国公路学报》2016年第3期1-8,65,共9页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(51378198);教育部高等学校博士学科点专项科研基金项目(20130161110017)

摘　　要：针对土体的孔隙介质特点及其变形参数随初始地应力或应力历史以及附加应力而变化的特征,采用宏观与微观相结合的分析方法,建立了反映孔隙介质特点的宏观土体与微观土颗粒骨架变形参数之间的关系模型。在此基础上,采用分级加载处理非线性分析问题的思路,建立了初始地应力或应力历史和附加应力对地基土体变形参数影响的分析模型,并据此提出了反映孔隙介质特点的地基沉降分层总和分析新方法。最后,通过工程实例计算和分析与已有相关方法进行了比较。研究结果表明:该方法能较好地反映地基土体变形参数随初始地应力或应力历史和附加应力而变化的特征,尤其适用于软土地基沉降分析,具有较强的合理性与可行性。According to the properties of porous media and the characteristics that the deformation parameters of soils changed with initial ground stress or stress history and additional stress,combining macroscopic with microscopic analysis method, some models describing the relationship between the macroscopic soils reflecting properties of porous media and microscopic deformation parameters of soil particle skeletons were established.On this basis,by introducing an analysis method of step-loading to deal with non-linear analysis,a model reflecting the effect of additional stress and initial ground stress or stress history on the deformation parameters of soils was set up,and a new layer-wise summation analysis method for settlement analysis of ground foundation which reflected the properties of porous media was proposed. Finally,the computation and analysis were carried out with practical engineering examples and the results were compared with the calculated results by the other existing methods.The results show that the method can better reflect the characteristics that deformation parameters of ground foundation soils change with initial ground stress or stress history and additional stress,which especially suits for the analysis of soft ground foundation settlement,showing its rationality and feasibility.

关 键 词：道路工程 地基沉降 分层总和法 孔隙介质 分级加载 变形参数 

分 类 号：U416.1[交通运输工程—道路与铁道工程]