凹形土质边坡降雨入渗研究的有限单元法

Study on the Rainfall Infiltration into the Concave Side Slope Considering 3D Effect

以杭州市某项目为例,在对地表水、地下水流动模型与集水效应理论分析的基础上,运用ABAQUS有限元分析软件,对三维凹形土质边坡降雨入渗进行流固耦合计算,研究发现三维凹形土质边坡的集水效应对积水深度影响较大,随着雨水大量渗入土体,使得空隙水压力大幅提高,在水力梯度作用下浸润锋影响更深,同时,三维边坡边界效应对边坡的稳定性有显著影响,完全约束边界条件下的边坡安全系数远大于自由边界下的边坡。

Taking a project in Hangzhou as an example,based on the theoretical analysis of surface water,groundwater flow model and water collecting effect,the ABAQUS finite element analysis software is used to calculate the fluid-solid coupling of three-dimensional concave soil slope rainfall infiltration.It is found that the water collecting effect of the three-dimensional concave soil slope has a great influence on the water depth.As the rainwater infiltrates into the soil,the water pressure in the gap is greatly increased.Under the hydraulic gradient,the infiltration front has a deeper influence.At the same time,the three-dimensional slope boundary effect has a significant influence on the stability of the slope.The slope under the boundary condition is completely constrained,and the slope is much safer than the slope under the free boundary.