干密度对非饱和膨胀土水分迁移参数的影响  

Influence of dry density on moisture migration parameter of unsaturated expansive soil

作　　者：翟聚云[1] 卫国祥[1] 

机构地区：[1]河南城建学院土木工程系,河南平顶山467000

出　　处：《岩土力学》2009年第11期3337-3341,共5页Rock and Soil Mechanics

基　　金：河南省科技发展计划项目(No.624250023)

摘　　要：研究了非饱和膨胀土的两个水分迁移参数——水体积变化系数m2w和渗透系数kw,得出非饱和膨胀土的水分迁移参数m2w和kw并非恒值,是基质吸力的函数,而基质吸力与含水率密切相关。因此,其参数大小随含水率变化而变化。此外,还明显受到干密度的影响,随干密度的不同而变化。取得了考虑干密度和含水率的水体积变化系数m2w、渗透系数kw和基质吸力之间的非线性关系,为进一步研究非饱和膨胀土地基水分场变化提供基础资料。Based on considering the influences of dry density and water content, the calculation of two parameters, water volume change m2^w and permeability coefficient kw, about moisture migration of unsaturated expansive soil is studied. It is shown that the m2^w and kw are not constants but functions of matric suction that is closely connected with water content. So the parameters change with the change of water content. In addition, they are influenced by dry density clearly and change with the change of it. Furthermore, it is shown that the relationship between kw, m2^w and matric suction is nonlinear by taking the soil density and water content into account. The results provide the fundamental data for further research on water sub-field change in unsaturated expansive soil ground.

关 键 词：非饱和膨胀土 干密度 基质吸力 渗透系数 含水率 

分 类 号：TU443[建筑科学—岩土工程]