非饱和土化学-塑性耦合本构行为的数值模拟

Numerical simulation for chemo-plastic coupled constitutive behavior of partially saturated soils

基于Hueckel提出的饱和黏土化学-塑性本构模型和Gallipoli提出的非饱和土弹塑性本构模型,提出了一个新的非饱和多孔介质的化学-塑性本构模型,并建立了该模型的隐式积分算法,算法中考虑了化学软化和非饱和吸力的影响。在已有的非饱和多孔介质有限元分析程序平台上进行了程序研发,对孔隙水中化学污染物浓度变化对非饱和土力学行为的影响进行数值模拟,使所研制的程序能够进行岩土工程问题的化学-力学耦合非线性分析。

This paper proposed a new chemo-plastic constitutive model for partially saturated soils on the basis of Hueckel＇s chemo-plastic model for saturated clays and Gallipoli＇s model for partially saturated soils. The implicit integration algorithm for this model is also presented. The chemical softening effect and variation of suction are taken into account in the present algorithm. The program code for the algorithm is developed based on the framework of finite element program for partially saturated porous media. The new program can be applied to numerical simulation for mechanical behavior of partially saturated soils with chemical pore fluid and chemo-mechanical coupled nonlinear analysis in geotechnical engineering problems.