三峡库区万州金金子滑坡稳定性分析  

Stability Analysis of Wanzhou Jinjinzi Landslide in Three Gorges Reservoir Area

作　　者：李志国 滕宇 杨秀元[3] 周正华 刘旭进 LI Zhiguo;TENG Yu;YANG Xiuyuan;ZHOU Zhenghua;LIU Xujin(East China Electric Power Design Institute Co.,LTD.of China Power Engineering Consulting Group,Shanghai 200063,China;Nari(Fujian)Electric Power Design Co.,LTD,Jiangsu Nanjing 210009,China;Center for Hydrogeology and Environmental Geology,Hebei Baoding 071051,China;College of Transportation Engineering of Nanjing Tech University,Jiangsu Nanjing 210009,China)

机构地区：[1]中国电力工程顾问集团华东电力设计院有限公司,上海200063 [2]南瑞电力设计有限公司,江苏南京210009 [3]中国地质调查局水文地质环境地质调查中心,河北保定071051 [4]南京工业大学交通运输工程学院,江苏南京210009

出　　处：《防灾减灾学报》2024年第2期22-29,共8页Journal of Disaster Prevention And Reduction

基　　金：中国电力工程顾问集团华东电力设计院有限公司科技项目(2023-0003);中国地质调查局地质调查项目(DD20160277)。

摘　　要：三峡库区两岸斜坡受库水位变化及降雨等影响,极易诱发滑坡灾害。万州金金子滑坡是三峡库区典型涉水型滑坡,滑坡体自2003年三峡大坝蓄水以来持续变形,2016年滑坡体发生了局部变形破坏。基于现场地质调查及工程地质钻探,结合GPS地表位移监测数据,分析了滑坡体变形特征;利用Geostu-dio软件进行敏感性数值分析,结合滑坡稳定性计算对其变形发展的趋势进行了预测。结果表明:在强降雨条件下,金金子滑坡整体虽处于稳定状态,但其强变形区因降雨导致滑带土的抗剪强度降低和滑坡体容重增加,从而加大滑坡体的下滑力,使滑坡体产生变形,滑坡面径流使滑坡体下滑力进一步增大,从而导致强变形区失稳破坏。The slopes on both sides of the Three Gorges Reservoir area are easily affected by changes in reservoir water levels and rainfall,which can easily cause landslide disasters.Wanzhou Jinjinzi landslide is a typical wading type landslide in the Three Gorges Reservoir area,and the landslide body has been deformed continuously since the Three Gorges Dam impounded in 2003,and local deformation and damage occurred in 2016.Based on the field geological survey and engineering geological drlling data and GPS surface displacement monitoring data,the deformation characteristics of the landslide body are analyzed,and Geostudio software was used to carry out numerical sensitivity analysis.According to the analysis of landslide stability,the trend of landslide deformation is predicted.The results show that:although the whole Jin Jinzi landslide is in a stable state under the condition of heavy rainfall,the shear strength of the soil in slip zone decreases and the unit weight of landslide increases due to rainfall in the strong deformation zone,which increases slide-down force of and deformation of landslide body,and the landslide surface runoff further increases the slide-down force of landslide body,which leads to the instability and destruction of the strong deformation area.

关 键 词：滑坡 变形特征 位移监测 数值模拟 边坡失稳 

分 类 号：P642.22[天文地球—工程地质学]