岩土工程学报2017，Vol.39Issue(3)：486-494,9.DOI:10.11779/CJGE201703012
不排水条件下非饱和土水力-力学耦合特性数值模拟
Numerical simulation of hydro-mechanical behaviors of unsaturated soils under fully undrained conditions
摘要
Abstract
Volume changes take place during the fully undrained compression tests on unsaturated soils. It is more difficult to simulate the undrained mechanical behaviors of unsaturated soils than those of saturated soils. In this study, the three-phase coupled governing equations for unsaturated soils under fully undrained conditions are derived using the porous medium theory and the elasto-plastic constitutive model for unsaturated soils. Numerical simulations of the fully undrained triaxial compression tests on unsaturated soils are performed based on the proposed three-phase coupled governing equations. The simulated results demonstrate that the proposed method predicts the hydraulic and mechanical behaviors (shear-induced volume compression, pore water pressure, pore air pressure and degree of saturation increase) of unsaturated soils accurately under the fully undrained conditions. The predictions of the fully undrained triaxial tests on unsaturated soils show good agreement with the test results obtained in literatures, verifying the applicability of the proposed method.关键词
非饱和土/不排水/水力-力学耦合/孔隙介质理论/数值模拟Key words
unsaturated soil/undrained condition/hydro-mechanical coupling/porous medium theory/numerical simulation分类
建筑与水利引用本文复制引用
刘文化,杨庆,唐小微,渦岡良介..不排水条件下非饱和土水力-力学耦合特性数值模拟[J].岩土工程学报,2017,39(3):486-494,9.基金项目
国家自然科学基金项目(51179023,41572252) （51179023,41572252）
