三峡库区水位变动下推移式滑坡监测变形分析  

Monitoring and deformation analysis of pushed landslide changing water level in the Three Gorges reservoir

作　　者：易朋莹[1,2] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆市高新工程勘察设计院有限公司,重庆400016

出　　处：《重庆大学学报（自然科学版）》2013年第9期127-132,共6页Journal of Chongqing University

基　　金：国家杰出青年科学基金资助项目(50625824);重庆市科委重点攻关项目(CSTC;2006AB7003)

摘　　要：三峡水库蓄水诱发了多处推移式滑坡变形加剧,为了加强对该类滑坡在三峡水库水位调节下变形特征的认识和灾害的预防,以三峡库区典型推移式滑坡——云阳凉水井滑坡地质条件和变形特征为例,制定监测方案;通过对滑坡地表位移、地表裂缝、深部位移、地表水位、降雨量及宏观巡查等方面的监测,分析监测指标的变化规律及相互关系,研究降雨及库水位升降对滑坡变形影响,分析了降雨、库水位变化时滑坡体变形和变形速度的规律;结合条块自身稳定系数变化量,揭示了推移式滑坡在降雨和库水位两种不同作用机制下的变形规律:降雨对后部变形影响大,库水对前部变形影响大,水位越高影响越强烈;降水时动水压力对滑体变形影响较大;同时受降雨和降水作用时滑体变形最大。其变形规律为该类滑坡防灾减灾提供了科学依据。The typical pushed landslide deform becomes stronger when water fills in the Three Gorges reservoir. In order to better recognize the landslides deformation characteristics and prevent the disaster by the water change regulation, the paper takes an example of the features of geological conditions and deformation of Liangshuijing landslide in Yunyang which is the typical pushed landslide in the Three Gorges reservoir, and designs monitoring project. Through monitoring data including the surface displacement, ground fissure, deep displacement, ground water level, rainfall and macroscopic patrol, the variety law and relationship among monitoring data are obtained. The regularity of landslide deformation and its deformation velocity are concluded when the variation of the rainfall and water level change. Combined the variation of bands-stabilization coefficient, deformation laws of the pushed landslide by the rainfall or the reservoir water are obtained. The deformation caused by rainfall is large in the back landslide, while the deformation caused by hydrodynamic pressure is large in the front landslide. The higher the water level, the severelier of the influence. The deformation is largely influenced by hydrodynamic pressure when reservoir water declines sharply in the front landslide, and the deformation is the largest when rainfall and reservoir sharpe water decline happened simultaneously in the whole landslide. The law provides scientific basis for reduction and prevention disaster of the pushed landslide.

关 键 词：水位变化 推移式 变形监测 变形规律 变形机制 

分 类 号：TU457[建筑科学—岩土工程]