库水位和降雨联合作用下藕塘滑坡稳定性研究  

Stability of Outang Landslide under the Combined Effect of Reservoir Water Level and Rainfall Fluctuations

作　　者：邵晨 苏爱军[1] 李川鄂 宋洪斌 Shao Chen;Su Aijun;Li Chuan'e;Song Hongbin(Three Gorges Research Center for Geohazards Ministry of Education,China University of Geosciences (Wuhan),Wuhan 430074,China;China Railway Survey and Design Group Co.,Lid.,Wuhan 430063,China;Chongqing Geological Disaster Prevention and Control Center,Chongqing 401147,China)

机构地区：[1]中国地质大学(武汉)教育部长江三峡库区地质灾害研究中心,湖北武汉430074 [2]中铁第四勘察设计集团有限公司,湖北武汉430063 [3]重庆市地质灾害防治中心,重庆401147

出　　处：《甘肃科学学报》2021年第6期134-141,共8页Journal of Gansu Sciences

摘　　要：自三峡水库二次蓄水以来,受库水位下降和降雨的影响,藕塘滑坡一直处于缓慢变形状态。采用GeoStudio的SEEP/W模块模拟滑坡的瞬态渗流场,同时考虑基吸力对非饱和土抗剪强度的影响,对滑坡稳定性进行动态分析。研究表明:受控于滑体入渗能力及自身结构,导致一级滑体前缘地下水位稍滞后于库水位变化,库水位下降速度越快,地下水位线上“凸”现象越明显,一级滑体整体呈现出稳定性系数先减后增趋势,二、三级滑体稳定性不受库水位变动影响,同时降雨强度越大,稳定性越差。在库区汛期时,一级滑体稳定性系数降至1.045,处于欠稳定状态,三级滑体稳定系数降至0.997,处于欠稳定状态。此研究成果可为三峡库区相似滑坡防治提供一定依据。Influenced by water level and rainfall,the Outang landslide has been in a state of slow deformation since the Three Gorges Reservoir second impoundment.The SEEP/W module of GeoStudio was used to simulate the transient seepage field of the landslide,and the influence of basal suction on the shear strength of unsaturated soil was taken into account to conduct dynamic analysis on the stability of the landslide.Research has shown that controlled by water infiltration capacity of the landslide mass and its structure,the underground water level of the leading edge of the grade I sliding body is slightly lagging behind the water level change,the faster the water level drop,the more obvious the convesx-shape of the underground water level is.The stability coefficient of the grade I sliding body decreases firstly then increases.The secondary and tertiary sliding stability is not affected by changes of water level.At the same time,the stability gets worse with the intensity of the rainfall.In the flood season of the reservoir area,the stability coefficient of the first-class sliding body drops to 1.045,which is in an under-stable state;the stability coefficient of the third-class sliding body drops to 0.997,which is also in an under-stable state.The research results can provide a certain basis for the prevention and control of similar landslides in the Three Gorges Reservoir area.

关 键 词：藕塘滑坡 库水位下降 降雨 渗流场 稳定性 

分 类 号：P642.22[天文地球—工程地质学]