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以三峡库区泥儿湾滑坡为例,通过建立渗流稳定性分析模型,研究了库水位上升对其稳定性的影响;同时,采用3DEC离散元软件,建立了二维离散元运动模型,深入分析了其破坏后的运动模式及变形规律。研究结果表明:(1)从失稳机制来看,水库蓄水所产生的浮脱减重效应是诱发滑坡失稳的重要因素;(2)从模拟破坏后的运动规律来看,水平位移在空间上从滑坡后缘至前缘、表层至深层逐渐增大,随滑体纵向深度的增长模式符合Logistic增长模型,在时间上的增长规律符合双曲线式增长;垂向位移在空间上从滑坡后缘至前缘依次减小,在时间上增长规律亦符合双曲线式增长,随滑体纵向深度的变化不明显;(3)该滑坡变形破坏模式可分为平动模式和转动模式。
Taking the mudflair landslide in the Three Gorges Reservoir area as an example, this paper studies the influence of reservoir water level rise on its stability by establishing the seepage stability analysis model. At the same time, using 3DEC discrete element software, a two-dimensional discrete element motion model is established and in-depth analysis After the destruction of their movement patterns and deformation laws. The results show that: (1) From the instability mechanism, the effect of water loss and weight loss caused by reservoir water storage is an important factor inducing landslide instability; (2) From the motion rule after simulated failure, Spatially, from the trailing edge of the landslide to the leading edge, the surface to the depth of the landslide gradually increases. The growth pattern with the longitudinal depth of the landslide accords with the Logistic growth model, and the growth law coincides with the hyperbolic growth in space. The vertical displacement spatially extends from the landslide The trailing edge to the leading edge decreases in turn, and the law of growth in time also accords with the hyperbolic growth, which does not change obviously with the longitudinal depth of the slide. (3) The deformation and failure modes of the landslide can be divided into the translational mode and the rotational mode.