中文摘要：

通过大量滑坡案例的地质调查，发现隔水层在滑坡过程中产生重要的影响．为了揭示相对隔水层对边坡稳定性的影响机制，构建包含隔水层的边坡模型，模拟降雨和斜坡后缘地下水人渗的物理力学作用．模型试验结果表明，降雨人渗主要影响隔水层上部土体，使含水量快速升高、土体变形和坡体的下滑推力迅速增大，隔水层下部土体的含水量等参数基本不变．在模型试验中当使后缘地下水入渗到隔水层下部坡体时，虽然只影响隔水层下部坡体的含水量和孔隙水压力，但力学作用影响整个边坡，不仅引起隔水层下部土体的变形，使下滑推力增大，而且在更大程度上影响隔水层上部土体的变形，使隔水层上部土层的下滑推力大幅提高．

英文摘要：

Many landslide cases by geological investigation showed that the effect of impermeable strata was important in sliding process. A slope model including an impermeable stratum was constructed to simulate the action of rainfall and groundwater infiltration from slope back edge in order to reveal the influence mechanism of impermeable strata. Simulation results showed that the rainfall-infiltration mainly affected the soil above the impermeable stratum, including the quick increasing of water content, soil deformation, and the rapid enhance of thrust force at slope toe. The soil below the impermeable stratum was not affected. The groundwater infiltrated into the stratum under impermeable layer at back edge only affected the water content and the pore pressure below the impermeable stratum. The effect caused by the groundwater infiltrated not only increased the sliding thrust at the slope toe and the deformation of the slope body below the impermeable stratum, but also greatly increased them above the impermeable stratum.