江南镇滑坡的成因分析与稳定性评价

Analysis on Reasons of Formation and Evaluation of Stability of Jiangnanzhen Landslide

江南镇滑坡位于长江三峡工程库区重庆段中上部,江南镇即位于滑坡体上,滑坡体的稳定性将危及当地居民及库区移民生命和财产的安全,同时也影响水库效益。为评价滑坡的稳定性,首先对滑坡进行了详细的现场调查,用工程地质分析方法分析了滑坡的成因,确定了库水位变化是影响该滑坡稳定性的主要因素,选取了几种典型工况,计算了库水位变化后的坡体浸润线,采用极限平衡法计算分析了水位在135m、145m、156m、175m以及水位变化情况下滑坡的稳定性。结果表明:在库水位变化过程中,大部分坡体土地都位于浸润线以下,土体处于饱和状态,土体中的有效抗滑应力降低;通过稳定性分析,库水位上涨后,坡体由原来的稳定状态发展到欠稳定状态,需要采取坡体加固措施。

Jiangnan town is locateed at the middle - upside of Three Gorges Reservoir in Chongqing city and stands on the Jiangnanzhen landslide. The stability of the landslide will endanger the security of local resident＇s life and wealth . In order to evaluate its stability, detailed geological investigation was carried out and geological reasons were analyzed. The movement of reservoir＇ s water line affected the landslide＇s stability mostly . The stability was evaluated by the limit equilibrium method in five work situations . The results reflect that： In the changing process of reservoir＇s water line, the most solid of the landslide are under the soaking line. The solid is on infiltrated situation, so the anti -slide force was reduced; Through the analysis of the landslide＇s stability , after the water level up,Jiangnianzhen landslide will worsening from stable situation to unstable, so we need to reinforce it with effective measures.