湖北省香溪河流域白家堡滑坡稳定性分析与评价

Stability analysis of Baijiabao Landslide in Xiangxi River Valley,Hubei Province

三峡大坝建成蓄水后,将导致库岸部分古滑体复活、新滑体产生,香溪河流域白家堡滑坡就是其中之一。文章在对该滑坡的工程地质条件、深部位移及伸缩计监测资料的研究基础上,分析了滑坡变形机理,得出白家堡滑坡只有一个滑动面,其总体变形趋势为推移式,目前仍具有微小的变形。滑坡变形与降雨及库水有密切联系。结合试验资料,针对滑坡变形的实际情况,采用反演分析方法进行了滑移面抗剪强度参数的反演计算。利用反演结果,在三峡水库蓄水4种不同水位工况下进行稳定性计算。结果表明,滑坡的稳定性系数经历了大→小→大的过程。正常蓄水位时稳定性处于较低状态。滑坡体饱水处于蠕滑或失稳状态,需尽快进行治理。

The Three Gorges Reservoir is impounding, so it undoubtedly makes some old landslides revive and produces some new landslides, and Baijiabao Landslide is one of them in Xiangxi River Valley. After studying its geo-engineering condition, on the base of depth deformation and extensomenter monitoring information, this paper analyzes the deformation mechanism of landslide, that there is only one slide face, and the whole deformation tendency of the landslide is pushing out. Combining with test information, there is slight deformation now. Thinking of the true condition of the landslide-the landslide is deformed but not sliding, it adopts back analysis method to calculate the shear strength of sliding-face. Then using the results, thinking of the impounding in the future, it calculates the safety factors at four different working conditions. The conclusion shows that after impounding in the future, the safety factor experiences from large to small, then to large; in the normal water level, the landslide is in the status of creeping or failure. So Baijiabao Landslide needs to be controlled recently.