边坡渗流耦合变形分析方法的研究及其应用

边坡在渗流作用下应力场会发生变化,是渗流场耦合应力场的作用结果。给出了一种考虑饱和-非饱和流渗影响的边坡弹塑性有限元分析方法,采用了不同含水量对抗剪强度影响的模型,求解带有渗透力作用项的土体弹塑性平衡方程得到边坡的应力应变分布,并应用于某滑坡的实际降雨分析。该实例分析证实,由于渗流作用影响,边坡变形加大,最后形成潜在滑动面。利用渗流耦合变形的弹塑性有限元法分析大气降雨造成土体滑坡的变形和发展是可行的,其在实际工程中的应用是成功的。

The Study of the Analysis Method of Seepage Coupled Deformation in Slope and Its Application

The field of stress of slope will make changes under seepage action. And seepage-field coupled stress-field result in the changes. A technique for elasto-plastic finite element method of slope under saturated-unsaturated seepage action is showed. The model of shear strength with water content is adopted. The stress and the stain of slope are determined by solving the coupling elasto-plastic equilibrium equations with seepage force taken into account, and the analysis method is applied to a practical slope analysis caused by rainfall in the paper. Besides, the example is calculated and draws conclusion by calculation. As for the effect of seepage action, the deformation of slope becomes wide, and makes the sliding surface of the slope at last. It is feasible and beneficial try to use the numerical method for analysis of slope deformation during rainfall, and is succeed in the application.