非饱和膨胀土非稳态渗流方程的参数探讨  

A Study on Parameters of Unsteady Transfusion Equation about Unsaturated Expansive Soil

作　　者：翟聚云[1] 

机构地区：[1]河南城建学院,河南平顶山467044

出　　处：《冰川冻土》2009年第3期582-585,共4页Journal of Glaciology and Geocryology

基　　金：河南省科技发展计划项目(624250023)资助

摘　　要：在利用有限元方程进行计算非饱和膨胀土地基水分场变化的非稳态渗流问题时,参数渗透系数kw和水体积变化系数m2w取值至关重要.根据膨胀土地基基质吸力与含水量的变化过程,得到了水体积变化系数m2w并非常数,理论与计算说明与干密度的变化存在相关性.通过拟和探讨了渗透系数kw、水体积变化系数m2w与干密度的相关关系,并对比说明不考虑与考虑干密度影响情况下m2w和kw的数值的差别,干密度对这两个参数的影响规律是在吸力大时影响程度小,在吸力小时影响程度大.In a finite element method for calculating moisture migration of unsteady transfusion in unsaturated expansive soil, valuing the water volume change parameter m2^w and the permeability coefficient kw is very important. From a process of matric suction and water content, it is found from theory and calculation that the water volume change parameter is not a constant and has something to do with dry density. Furthermore, the nonlinear dependence of kw and m2^w on dry density is discussed. Water volume change parameter m2^w and permeability coefficient kw is different in consideration of the effect of dry density and without consideration of the effect of dry density. The basic data for studying the moisture migration in unsaturated expansive soil is available.

关 键 词：膨胀土 干密度 体积变化系数 渗透系数 

分 类 号：TU441.4[建筑科学—岩土工程]