降雨渗流作用下滑坡变形数值分析

Numerical analysis of deformation of slope under seepage action of rain

给出了一种考虑渗流作用影响的边坡弹塑性有限元分析方法,采用了不同降雨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,进而求解边坡的塑性区,并应用于降雨滑坡的分析。由算例分析发现,由于渗流作用影响,边坡变形加大,最后形成潜在滑动面,是符合实际情况的。基于以上理论和算例研究得知,利用渗流耦合应力的弹塑性来分析大气降雨而引起的土体滑坡的变形和发展是可行的,是一种有益的尝试。

The paper shows a technique of elasto-plastic finite element method of slope under seepage action. The model of shear strength with different rainfall 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 plastic zone of slope is also got from the solution to the equations. Finally, the analysis method is applied to slope deformation caused by rainfall in the paper. Besides, the example is calculated and a conclusion is drawn 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. We can draw a conclusion from the above analysis and calculation： The numerical method for the analysis of slope deformation during rainfall is feasible and is a beneficial try.