中文摘要：

文章基于饱和、非饱和渗流理论及强度折减法,分析了降雨入渗条件下非饱和土质边坡的稳定性,研究了4种降雨模式对边坡中饱和度、吸力、边坡安全系数及潜在滑动面位置的影响,定义了吸力降低深度,分析了吸力降低深度与边坡安全系数及滑动面位置的关系。算例分析表明：降雨量相同时,降雨模式对边坡安全系数及潜在滑动面位置的影响与土体的饱和渗透系数有关;当饱和渗透系数较大时,各种降雨模式的影响无明显区别;当饱和渗透系数较小时,长时间小强度降雨更易导致边坡的失稳;考虑参数的变异性时,力学参数变异性对边坡安全系数及滑面位置的影响较大;水力参数中,土水特征曲线拟合参数a及n的变异性的影响较大。

英文摘要：

Based on saturated-unsaturated seepage theory and strength reduction method, the stability of an un- saturated soil slope under rainfall infiltration is analyzed. Considering four rainfall modes with the same total rainfall, the changing rules of the degree of saturation, the suction with depth, the value of factor of safety and the position of potential slip surface are studied. The depth of suction reduction（IN） is defined, and the correlation between the depth of suction reduction and the factor of safety and its corresponding slip surface are analyzed. The results of numerical example show that when the total rainfall is the same, the influence of rainfall modes on the factor of safety and the corresponding potential slip surface depends on the permeability of unsaturated soil. If the saturated hydraulic conductivity is relatively large, there is no evident difference be- tween the values of factor of safety and the positions of potential slip surfaces. But if the saturated hydraulic conductivity is relatively small, the rainfall mode with a long-time weak rainfall is more dangerous than the rainfall mode with a short-time strong rainfall. When the variability of soil parameters is considered, the in- fluence of the variability of mechanical parameters on the factor of safety and the position of slip surface is lar- ger than that of the hydraulic parameters And among the four hydraulic parameters, fitting parameters for soil-water characteristic curve a and n have larger effect on the factor of safety and the position of slip surface than parameters Sr and ks.