Abstract: Seepage is the key factor to undermine the soil slope and to make it lose the stability,which reduces the effective stress and the shear strength of soil.It is obvious that slope excavation is inescapable in the construction of the road.Using FEM,the influence of slope excavation on seepage fields of slopes during the road construction is analyzed through the introduction of boundary conditions and constraints of seepage model.Taking some road slope as an example,the excavating process,pressure water head and velocity profile are simulated under the influence of rainfall infiltration.The results show that the velocity of the specified section increases after the excavation.The influence of seepage change on slope stability is also analyzed simply.

Key words: slope excavation, seepage, rainfall infiltration, FEM

摘要： 渗流作用是土质边坡失稳破坏的主要因素,渗流使土体颗粒间的有效应力和抗剪强度降低。公路建设中,边坡的开挖必不可少。运用有限元理论,通过渗流有限元模型边界条件、约束条件建立方法的介绍,分析研究边坡开挖对坡体内渗流场的影响。以某公路边坡为例,在降雨条件下对未开挖、上台阶开挖、下台阶开挖三个阶段渗流场分布进行数值模拟,绘出各阶段边坡内部的水头等值线图和在指定控制性截面上流速的分布曲线,并分析了渗流场改变对边坡稳定性的影响。

关键词: 边坡开挖, 渗流, 坡面降水, 有限元