渗流作用下边坡稳定性分析的强度折减弹塑性有限元法

将边坡渗流的有限元计算和稳定分析的强度折减弹塑性有限元法相结合，对渗流作用下边坡的稳定性进行有限元计算与分析。基于有限元计算所得到的堤坝各单元结点水头，通过面力法和体力法两种等效方法计算渗流作用力，即通过单元结点水头计算作用于单元周边的孔隙水压力及其等价结点力或通过单元结点水头计算作用在单元上的渗透力及其等价结点力。将所确定的渗流等价结点力与土的自重、地震力等其它荷载共同施加于边坡上，采用强度折减弹塑性有限元数值分析确定边坡的临界失稳状态及其所相应的安全系数。应用实例表明该方法是有效的。

Elasto-plastic FEM for embankment stability analysis under the condition of seepage based on the technique of shear strength reduction

The FEM for embankment seepage calculation is combined with the technique of shear strength reduction for elasto-plastic FEM in stability analysis to calculate the embankment stability under the condition of seepage. The water heads acting on the nodes of every element are calculated by FEM for seepage analysis. Then both the approaches based on surface forces and body forces are respectively applied to calculate the seepage-induced equivalent nodal forces. The forces including the calculated seepage-induced equivalent nodal forces, dead weight of soil and earthquake forces are totally applied to numerically analyze the critical state of stability or failure of the embankment by using FEM based on the technique of shear strength reduction and determine the corresponding factor of safety. The application shows that the proposed method is effective.