中文摘要：

分析了降雨入渗对路堑边坡稳定性的影响机理和特性，以非饱和渗流理论为基础，建立了入渗条件下的流-固耦合数学模型及SWCC模型模型，并根据现场土质特性对广东某环城高速公路堑边坡在不同降雨强度下的坡内水压力和流速分布进行了预测，并计算得到了降雨入渗后的安全系数。结果表明：随着土体含水率增加，内摩擦角和粘聚力下降导致抗剪强度急剧下降，是边坡失稳的根本原因：随着降雨强度的增大，最小安全系数不断减小。

英文摘要：

The mechanism and characteristics of soil cutting slope of expressway under rainfall infiltration are presented. Based on the unsaturated seepage theory, the fluid-matrix model and SWCC model are built. The distribution of water pressure and fluid velocity, of cutting slope of GuangDong Expressway in different rainfall strength was evaluated and safety coefficient after rainfall is given. The results show as the moisture increased, the internal friction angle and cohesive strength decrease with shearing strength reduced, which is the prime reason of the slope. The safety coefficient decreases with rainfall strength increasing.