库水升降对漩口滑坡稳定性的影响规律  

Impact Rule of Reservoir Water Level Fluctuation on the Stability of Xuankou Landslide

作　　者：吴凯峰[1] 余凯[1] 姚鑫[2] 李凌婧 

机构地区：[1]中交第二公路勘察设计研究院有限公司,武汉430056 [2]中国地质科学院地质力学研究所,北京100081

出　　处：《地质科技情报》2017年第6期256-260,共5页Geological Science and Technology Information

基　　金：国家自然科学基金项目(41672359);中国地质调查局工作项目(DD20179282;DD20160272);院所长基金项目(DZLXJK201611)

摘　　要：库水位升降是加剧库区滑坡危险性的主要因素。以西南地区紫坪铺水电站漩口滑坡为例,借助Geo-Studio数值模拟软件,分析了库水位变化对滑坡渗流场及稳定性的影响规律,结合监测数据验证了受库水位影响滑坡稳定性的发展趋势。结果表明:通过滑体颗粒级配曲线和修正的Kovács模型所确定的饱和-非饱和渗流参数,能够很好地模拟滑坡渗流场变化。在库水位上升阶段,稳定性系数峰值随着库水位上升速率的增大而增大。库水位下降时,稳定性系数先减小到最低值后逐渐增大,最低值时间与库水位最低点的时间一致。库水位下降速率越快,滑坡稳定性系数越差。库水位升降主要对滑坡前缘稳定性造成影响。Variation of reservoir water level is a main factor to decrease the landslides stability in reservoir. In order to study the effect of reservoir water level on landslide stability, the paper takes Xuankou land- slide in Zipingpu reservoir as an example. The Geo-Studio software was used to analyze the seepage field and stability of landslide with reservoir water level rising and falling. The numerical simulation was verified by the monitoring data of reservoir water level and ground displacement. The results show that the soil-wa- ter characteristic curve determined by the grading curve and the improved Kovdcs model could be used to simulate the seepage field. When water level is raising, the landsliders stability is increases with the rise rate of reservoir water level. When the water level is falling , the stability has two stages from decrease to increase. The moment of minim stability occurs at the lowest point of reservoir water level declines. Reser- voir water level fluctuation on the stability is mainly affect the front of Xuankou landslide.

关 键 词：水库滑坡 库水位升降 渗流场 监测 

分 类 号：P588.12[天文地球—岩石学]