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拟建水库右坝肩处于由砖红色砂岩夹薄层或透镜状泥岩、粉砂质泥岩构成的斜向V形河谷中,无明显断层构造,雨水充沛且存在一古滑坡,经过调查,滑坡主要由滑坡堆积体和滑动面以及其下方的扰动带组成,滑坡区发育的纵向和横向结构面以及岩层面构成一楔形槽。认为滑坡的成因是暴雨下楔形槽内控制的滑移-拉裂破坏。经过定性分析,古滑坡天然状态是稳定的。采用极限平衡法计算古滑坡在天然状态、地震作用以及暴雨等工况下的稳定系数分别为1.45、1.39及1.27,由此可知滑坡在天然状态下是稳定的,地震作用对其稳定性影响不大,但暴雨作用下滑坡的稳定性有所降低。最后通过数值模拟再现了现阶段古滑坡的应力应变场和变形破坏特征。
The right dam abutment of the proposed reservoir is located in an oblique V-shaped valley formed by brick-red sandstone sand sheets, lenticular mudstone and silty mudstone. There is no obvious fault structure, abundant rainfall and an ancient landslide. After investigation, the main landslide The landslide accumulation body and the sliding surface and the disturbance belt below the landslide area constitute a wedge-shaped groove. It is considered that the cause of landslide is the slip-pull failure controlled by wedge-shaped trough under rainstorm. After qualitative analysis, the natural state of the ancient landslide is stable. By using the limit equilibrium method, the stability coefficients of the ancient landslide under natural conditions, earthquakes and heavy rain are 1.45, 1.39 and 1.27, respectively. Therefore, it can be seen that the landslide is stable under natural conditions and the effect of earthquake on its stability is not affected Large, but the stability of the landslide has been reduced under the heavy rain. Finally, the stress-strain field and the deformation and failure characteristics of the ancient landslide are reproduced by numerical simulation.