库水位升降条件下滑坡的稳定性极小状态——以三峡库区为例  

Lowest stability state of landslides under rising and descending of reservoir water level:A case study on Three Gorges Area

作　　者：谭建民[1] 韩会卿[1] 伏永朋[1] 

机构地区：[1]中国地质调查局武汉地质调查中心,武汉430205

出　　处：《工程勘察》2012年第4期42-46,54,共6页Geotechnical Investigation & Surveying

摘　　要：滑坡的变形破坏过程和所造成的不良地质环境问题对人类工程活动带来十分严重的危害,并且还可能引起生态环境的失调和破坏,造成更为深远的影响。对三峡库区滑坡研究发现,随着库水位的动态变化滑坡的稳定性并非出现单调的变化趋势,而是在这个过程中达到稳定性系数极小的状态。然而,对这个极小稳定性状态的形成及特征还缺少论述。本文基于滑坡地下水运动模型和稳定性评价的极限平衡模型对库水位升降条件下滑坡稳定性极小状态的形成机理和影响因素进行研究。结果表明,滑坡稳定性极小状态的形成时间和稳定性系数受到含水层渗透系数和库水位升降速率的影响,并且滑坡在库水位下降阶段的稳定性极小状态比蓄水期更具有失稳风险。The deformation and failure process of landslide causing many bad geological environment problems are very serious to human activity,and may cause the disorder and destruction of ecological environment.The study of landslide in Three Gorges reservoir area that,as the dynamic change of reservoir water level of landslide stability does not appear drab change trend,but in the process to achieve lowest stability state.However,for the tiny state formation and characteristics of the stability still lacks discussions.This paper,based on the landslide groundwater movement model and limit equilibrium model evaluates the tiny stability state formation mechanism and influence factors under reservoir water level.The results show that the formation time of the tiny state landslide stability and stability coefficient by permeability coefficient and the influence of water level lift rate effect,and landslides in the reservoir water level down stage,its lower stability state than impoundment stage more lose stability.

关 键 词：滑坡 稳定性极小状态 地下水运动模型 极限平衡模型 

分 类 号：P642.22[天文地球—工程地质学]