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以马家村滑坡为例,用有限元方法分析了降雨入渗条件下残坡积土斜坡的暂态非饱和渗流场,用极限平衡方法分析了残坡积土斜坡的渗流稳定性。分析了斜坡结构、临空面、降雨对斜坡变形与稳定性的影响,分析了降雨诱发残坡积土滑坡的过程。降雨诱发残坡积土滑坡的机理为:降雨入渗使残坡积土斜坡中形成软弱带;坡脚开挖使斜坡坡面出现拉张裂隙;降雨使坡面裂隙中充满水,导致斜坡土体饱和,抗剪强度降低,同时产生动水压力,不利于斜坡的稳定;当斜坡的下滑力大于抗滑力时发生滑动。
Taking Majiacun landslide as an example, finite element method is used to analyze the transient unsaturated seepage field of residual soil slope under rainfall infiltration, and the limit equilibrium method is used to analyze the seepage stability of residual soil slope. The effects of slope structure, air surface and rainfall on slope deformation and stability are analyzed. The process of rainfall-induced slope landslide is analyzed. The mechanism of rain-induced slope landslide is as follows: rainfall infiltration causes the formation of weak zones in the slope landslides; excavation of hillsides causes tension cracks to appear on slope slopes; rainfall causes the slope cracks to fill with water, Body saturation, shear strength decreased, while generating hydrodynamic pressure, is not conducive to the stability of the slope; when the slope of the sliding force greater than the sliding resistance slip occurs.