清溪水库库区左岸山体滑坡群发育成因研究  

Study on Formation of Landslide Groups on Left Bank of Qingxi Reservoir Area

作　　者：姚纪华 刘亚玲 吕慧珠 宋文杰 赵文刚 Yao Jihua;Liu Yaling;Lv Huizhu;Song Wenjie;Zhao Wengang(Hunan Water Resources and Hydropower Research Institute;Hunan Jiuyi Engineering Design Co.,Ltd.)

机构地区：[1]湖南省水利水电科学研究院,长沙市410007 [2]湖南九一工程设计有限公司,长沙市424100

出　　处：《勘察科学技术》2021年第2期1-6,共6页Site Investigation Science and Technology

基　　金：湖南省重大水利科技项目(XSKJ2018179-33);湖南省一般水利科技项目(XSKJ2018179-44、XSKJ2018179-46、XSKJ2019081-16)。

摘　　要：该文基于现场地质调查和测绘、坑钻探、室内土工试验等成果,分析清溪水库库区滑坡群地质结构特性及变形失稳机制,建立地质概化模型,并截取典型地质剖面构建力学概化计算模型,借助有限元分析对滑坡岩土体物理力学参数进行反演和修正,并利用修正后参数模拟计算多种工况下滑坡群的稳定性。结果表明:库区顺向岩层和软弱夹层是库区左岸滑坡群发育的根本原因;长期水岩作用和集中降雨入渗是其关键诱因。滑坡群在天然状态下是稳定的;天然状态+暴雨、正常蓄水位、正常蓄水位+暴雨和库水位骤降等工况下将处于局部或整体失稳状态。Based on the results of field geological survey, surveying and mapping, pit drilling and indoor geotechnical test, this paper analyzes the geological structure characteristics and deformation instability mechanism of landslide group in Qingxi Reservoir area, establishes a geological generalization model, and intercepts typical geological sections to construct a mechanical generalization calculation model. With the help of finite element analysis, the physical and mechanical parameters of landslide rock and soil are inversed and modified, and the stability of landslide group under various working conditions is simulated by using the modified parameters. The results show that the consequent strata and weak intercalation are the fundamental reasons for the development of landslide group on the left bank of the reservoir area;The long term water-rock interaction and concentrated rainfall infiltration are the key inducement. The landslide group is stable in natural state;Under the natural state + rainstorm, normal water level, normal water level + rainstorm and sudden drop of reservoir water level, it will be in local or overall instability.

关 键 词：滑坡群 软弱夹层 变形失稳 水岩作用 稳定性分析 抗剪强度 

分 类 号：P642.22[天文地球—工程地质学]