库水位升降与降雨条件下滑坡的渗流及稳定性分析

地下水对库岸边坡的稳定性影响重大，以库区某滑坡为例，通过对滑坡的变形特征和专业监测数据分析，结合三峡库区库水位调度方案及降雨条件，依据非饱和土渗流理论和极限平衡理论，运用有限元分析软件Geo-Studio，对该滑坡设置了8种工况，分析其在145~175 m库水位波动及降雨条件下的渗流及稳定性。计算结果表明滑坡体内地下水位随库水位升降而升降，降雨对滑体后部地下水位有一定影响;滑坡稳定性在库水位上升时减小，且上升速率越大，稳定性系数越小;库水位下降，稳定性系数先减小后增大;降雨条件下，稳定性系数有所减小。所得结果可为库岸边坡的稳定性分析提供一定参考。

Seepage Flow and Stability Analysis of A Landslide under the Conditions of Water Level Fluctuation of Reservoir and Rainfall

Groundwater played a significant role in the stability of reservoir slopes. A landslide in reservoir area was taken as an example through analyzing its deformation characteristics and professional monitoring data. By the regulated scheme of Three Gorges Reservoir and rainfall conditions, based on theories of unsaturated seepage and limit equilibrium, eight working conditions were set for seepage and stability analysis of the landslide. Under conditions of water level fluctuation from 175 meters to 145 meters and rainfall, the analysis adopted Geo-Studio software based on finite element method. Results show that the reservoir water level changes exactly in accordance with the groundwater level, and rainfall has some effect on water level of the landslide’s back. Slope safety factor decreases with the rise of water level or the increase of rising rate. Moreover, slope safety factor firstly decreases and then increases with the drop of water level. Finally, slope safety factor decreases a little under the conditions of rainfall.