饱和渗透系数空间变异性对边坡稳定性的影响

研究了降雨雨型、雨强和持时对边坡孔隙水压力分布的影响以及降雨入渗条件下饱和渗透系数的空间变异性对孔隙水压力、含水率、抗剪强度参数、局部安全系数等参数空间分布的影响。研究结果表明,降雨特性对边坡孔隙水压力的影响较大;受渗流主方向影响,降雨条件下饱和渗透系数的水平波动尺度对孔隙水压力及含水率的变异性影响小于竖向波动尺度,降雨致滑坡的临界滑面基本与坡面平行且深度较浅;随着饱和渗透系数水平波动尺度的增加,滑坡深度随之增大,从总体上坡体上部局部安全系数随饱和渗透系数竖向波动尺度的增加而减小。

Effects of the spatial variability of saturated permeability on the slope stability

We studied the effects of rainfall pattern, intensity, and duration on the pore-water pressure in the slope and the spatial variability of the saturated permeability on the spatial distribution of pore-water pressure, water content, shear strength parameters and local factor of safety under rainfall. The results show that the rainfall characteristics have significant effects on the pore-water pressure for a given slope. Affected by the main direction of flow, the effect of the horizontal fluctuation scale of saturated permeability on the variation of the pore-water pressure and the water content is greater than that of the vertical fluctuation scale. The critical slip surface of the rainfall-induced landslide is almost parallel to the slope and the depth of the landslide is small. As the increase of the horizontal fluctuation scale, the depth of the landslide increases. Generally speaking, local factor of safety decreases as the vertical fluctuation scale increases.