金沙江某大型水电站滑坡稳定性分析  

Stability Analysis of A Large Hydropower Station landslide in Jinsha River

作　　者：周晓平[1] 李梦[1] Zhou Xiaoping;Li Meng(Northwest Survey and Design Institute Co.,Ltd.,Xi'an 710065,Shaanxi)

机构地区：[1]西北勘测设计研究院有限公司

出　　处：《陕西水利》2019年第9期118-122,共5页Shaanxi Water Resources

摘　　要：金沙江某大型水电站滑坡体位于水电站库区右岸,分布高程广、规模大,对场区对外交通影响大。采用刚体极限平衡法对滑坡蓄水后进行稳定分析,滑坡体次级滑体及表部堆积体总体稳定性较差,在暴雨工况和地震工况下存在失稳的危险,需实施工程处理措施进行处理。根据滑坡的稳定性特点,滑坡的增稳治理以"治水为主、表部挡护、监测预警"为原则,采取滑坡体表部截、排水,滑面以下排水洞排水,头部适当减载,坡面钢筋混凝土格栅和预应力锚索挡护,次级滑体和坡面拉裂缝采取回填封闭防渗等综合增稳治理设计方案,治理后的滑坡体的安全稳定性能基本满足规范要求。The landslide body of a large hydropower station in Jinsha River is located on the right bank of the reservoir area of the hydropower station.The distribution is wide and the scale is large,which has a great impact on the external traffic in the site.The rigid body limit equilibrium method is used to analyze the stability of the landslide after water storage.The overall stability of the secondary landslide and surface deposits of the landslide body is poor.There is danger of instability under heavy rain conditions and seismic conditions.Engineering treatment is required and the measures are processed.According to the stability characteristics of the landslide,the stability control of the landslide is based on the principle of"maintenance of water,surface protection,monitoring and early warning".The landslide body is cut and drained,the drainage hole below the sliding surface is drained,and the head is properly deloaded.The slope reinforced concrete grid and pre-stressed anchor cable retaining,the secondary sliding body and the slope cracking adopt the comprehensive stabilization design scheme of backfilling and anti-seepage,etc.The safety and stability of the landslide body after treatment basicallymeets the requirements of the specification.

关 键 词：滑坡 治理 稳定 刚体极限平衡法 

分 类 号：P642.22[天文地球—工程地质学]