非饱和土渗流与变形耦合问题的有限元分析  

Finite element analysis of coupling seepage and deformation in unsaturated soils

作　　者：徐炎兵[1] 韦昌富[1] 李幻[1] 陈辉[1] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点试验室,武汉430071

出　　处：《岩土力学》2009年第5期1490-1496,共7页Rock and Soil Mechanics

基　　金：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室开放基金资助(No.Q110601)

摘　　要：基于多孔介质力学原理,建立能模拟非饱和土两相流动与变形耦合问题的理论模型。利用Galerkin法对控制方程进行离散,得到控制方程的有限元计算格式。在此基础上,自主开发了有限元计算程序U-DYSAC2,并对Liakopoulos两相流动试验这一经典算例以及重非亲水相流体(DNAPL)在饱和多孔介质中迁移的离心模型试验进行了数值模拟。计算结果表明,理论预测与试验结果基本吻合,验证了所提出的分析方法在模拟非饱和土渗流以及变形问题时的有效性,从而为定量研究饱和-非饱和渗流以及变形问题提供了一条有效途径。Based on the theory of mechanics of porous media, a theoretical model which concerned about the air-water flow and deformation in unsaturated soil is proposed. The governing equation is discreted by Galerkin method; and a new finite element code, U-DYSAC2, is developed. The classical Liakopoulos problem and a centrifuge model test which concerned about the dense non-aqueous phase liquids transporting through saturated porous media are simulated by this code. It is found that the predicted values agree very well with experimental records in the literature, so as to show that the proposed model is capable for simulating the seepage and deformation in unsaturated soils. Then the problems of the saturated-unsaturated seepage and deformation can be quantitatively analyzed by this method.

关 键 词：非饱和土 两相流 有限元法 离心模型试验 饱和-非饱和渗流 

分 类 号：TU411[建筑科学—岩土工程] O357[建筑科学—土工工程]