考虑暴雨入渗的覆盖层滑坡体渗流特性及稳定性评价

Seepage Characteristics and Stability Evaluation of Landslide Cover Considering Rain Infiltration

为了分析雅砻江流域卡拉水电站上游库区上田镇滑坡体受暴雨影响程度,选取了上田镇滑坡体典型断面,建立二维饱和-非饱和渗流计算模型,采用有限元法模拟了暴雨入渗过程。根据模拟结果分析了在暴雨入渗条件下蓄水前后的工程边坡的渗流特性及应力分布,并对边坡稳定性和边坡防护措施效果进行评价,结果表明,暴雨入渗会引起边坡的稳定性降低,并可能引起边坡失稳。有限元法对分析边坡稳定性有实际的指导意义。

Rain infiltration is an important factor on the stability of slope in the reservoir area. In order to analyze the effects of rain infiltration on the Shangtianzhen landslide body in the upstream reservoir area of Kala hydropower station in the Yalong River Basin, a two-dimensional unsaturated and saturated seepage field model was developed based on a typical profile of the Shangtianzhen landslide body. The finite element method was used to simulate the rain infiltration process. The simulation re- sults were used to analyze the seepage characteristics and stress distribution of the landslide body under heavy rain infiltration before and after impounding,and to evaluate the stability and effect of protective measures of the slope. The results indicated that rain infiltration can reduce the slope stability and may even cause slope instability.