本文将基于边坡非饱和渗流的有限元分析结果，将非饱和土强度公式引入剩余推力法，建立边坡稳定性系数计算方法，编制计算程序USSP。应用计算程序，选取三峡库区滑面形态为下凹和直线型两种滑坡，定量分析了降雨入渗、库水变动对滑坡下滑力和阻滑力的影响。结果表明：下凹型滑坡浮托减重效应占主导地位，引起的下滑力和阻滑力变化较大，与库水变动关系密切；稳定高水位时最危险。直线型滑坡渗透作用占主导地位，与库水变动关系密切；刚降至低水位时最危险。
Based on the FEM analysis of unsaturated seepage of slope and strength of unsaturated soil, adopted the assumption of rigid body limit equilibrium, we compose a calculation program called USSP. By using the program, the variations of safety of landslides of which the slice is up concave and line under rainfall and water level change of reservoir are researched, and the impact of permeation, buoyancy and rainfall to glide force and antislice force are also analyzed. The results show that: to the slide which slice is up concave, the impact of buoyancy is significant and related closely to water change, and the most dangerous condition is stable high water level. To the slide which slice is line, the impact of permeation is significant and related closely to water change too, and the most dangerous condition is at the beginning of reaching the low water level.
