非饱和土三轴压缩应力路径试验的数值模拟研究

应力路径对土的强度和变形性质具有重要影响。相对于饱和土而言，控制吸力条件下的非饱和土三轴压缩状态的应力路径研究更加复杂。随着非饱和土本构理论的不断发展，理论和试验研究结果表明，非饱和土弹塑性本构模型可以用来近似地描述非饱和土的强度和变形性质。因而，运用非饱和土弹塑性本构模型对控制吸力条件下的3种非饱和土三轴压缩应力路径试验进行数值模拟是一种有效的理论研究手段。采用Barcelona模型能够对此类试验进行较好的数值模拟，其研究结果表明，在控制吸力条件的三轴压缩状态下应力路径对非饱和土的强度和变形性质具有重要影响。

Numerical simulation of suction-controlled stress paths tests for unsaturated soil under triaxial compression stress states

Stress paths have material effect on strength and deformation behaviors of soil. The suction controlled stress path study of unsaturated soil is more complex than saturated soil under triaxial compression stress state. The strength and deformation behaviors of unsaturated soil can be approximately described by elastoplastic constitutive model that was proved by abundance academic and test researches. It is an effectual academic study method that adopting elastoplastic constitutive model of unsaturated soil to simulate unsaturated soil suction-controlled stress paths tests under triaxial compression stress state. Barcelona model is used to process the study; and the results show that the stress paths have important effect on strength and deformation behaviors of unsaturated soil under suction controlled triaxial compression stress state.