库水位日降幅对白家包滑坡稳定性影响分析

以三峡库区白家包滑坡为研究对象,通过野外勘察和资料收集,对比分析GPS监测曲线、库水位变动曲线和降雨历时曲线,并利用Geo-Studio的SEEP模块和FLAC~(3D)分别对各种不同库水位日降幅条件下滑坡渗流场及应力应变进行了数值模拟。结果表明,滑坡的应力场、位移场、塑性区均随库水位日降幅增大而变化,其变形量及塑性区范围均随库水位日降幅的增大而增大。综合分析认为,目前白家包滑坡处于欠稳定-不稳定状态,在增大库水位日降幅条件下滑坡稳定性将会进一步降低而导致失稳。研究成果可为三峡水库调度确定库水位日降幅标准及滑坡防治提供参考依据。

Influence of water level daily decrease of Three Gorges Reservoir on Baijiabao Landslide stability

Taking Baijiabao Landslide in Three Gorges Reservoir area as a case,the GPS monitoring curve,water level fluctuation curve and rainfall duration curve were obtained and analyzed based on field investigation and data collection.Then,the SEEP modules in Geo-Studio software and FLAC3D were used to simulate the landslide seepage flow field,stress and strain under different reservoir water level daily decrease.The results show that the landslide stress field,displacement field and plastic zone vary with the increase of the water level daily drop amplitude.The deformation and the range of plastic zone expand with the increase of drop amplitude.In summary,Baijiabao Landslide is in a less stable-unstable state,and the stability will further reduce when the water level daily drop rate increase.The research results can provide reference for Three Gorges reservoir water level decrease standard and landslide prevention.