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为了解三峡水库蓄水对树坪滑坡的影响,基于监测资料分析了滑坡位移随水库蓄水变化的规律,采用有限元分析软件Geo-studio分析了各蓄水阶段树坪滑坡的渗流场、位移场和稳定性变化特征。结果表明,水库蓄水过程可分为125~139~135m、135~156~145m和145~175~145m三个阶段,每个蓄水阶段对树坪滑坡的影响程度不同;库水位上升时滑体内地下水浸润线呈内凹趋势,库水位下降时滑体内地下水浸润线呈外凸趋势,且凹凸程度与运行水位差正相关;第一阶段蓄水过程主要引起树坪滑坡前缘局部变形,第二阶段蓄水过程中滑坡前缘变形量增大且变形逐步向滑坡中部发展,第三阶段蓄水过程中滑坡前缘及中部变形量明显增大,变形逐渐向后发展。最后根据树坪滑坡变形机理,提出了防治措施。研究成果可为三峡库区管理提供理论依据。
In order to understand the influence of impoundment of Three Gorges Reservoir on Shuping Landslide, the regularity of landslide displacement with the reservoir impoundment was analyzed based on the monitoring data. The seepage field and displacement of Shuping landslide at each stage of water storage were analyzed by finite element analysis software Geo-studio Field and stability change characteristics. The results show that the impoundment process of the reservoir can be divided into three stages of 125 ~ 139 ~ 135m, 135 ~ 156 ~ 145m and 145 ~ 175 ~ 145m, and the impacts of each impounding stage on Shuping landslide are different. The groundwater infiltration line in the body showed a concave tendency. When the reservoir water level decreased, the infiltration line of groundwater in the slide body showed a convex trend, and the degree of the depression was positively correlated with the operation water level. The first stage of the water storage process mainly caused the local deformation of the front of the Shuping landslide. During the second stage of water storage, the deformation of landslide front increases and deformation gradually develops into the central part of the landslide. During the third stage of water storage, the deformation of landslide front and center increases obviously, and deformation gradually develops backward. Finally, based on the deformation mechanism of Shuping landslide, it puts forward prevention measures. The research results can provide a theoretical basis for the management of the Three Gorges reservoir area.