Based on the extensive distribution of colluvial soil–strong weathered rock slope in the southeast coastal area, and with the saturated unsaturated seepage theory and the finite element seepage calculation of 1-D and 2-D model, the impact of the thickness of residual soil on the distribution of moisture content and pore water pressure under different rainfall conditions were obtained, and the influence of slope thickness and slope ratio on the rainfall infiltration depth of different sections of the 2-D slope model was studied. The results show that the depth of rainfall infiltration is proportional to the thickness of the soil layer of the slope, and the influence degree of slope soil thickness on water content is related to the intensity of rainfall. The relationship between the rainfall intensity and the saturated permeability coefficient of the soil slope determines the distribution characteristics of the pore water pressure; thicker soil layer causes the greater depth of rainfall infiltration in each section of the slope, and the bigger slope ratio leads to the bigger rainfall infiltration depth of the bottom section. The upper section of the slope and the middle section of the slope are less affected by the slope ratio. The soil structure of slope has significant influence on the distribution of water content under rainfall.%以东南沿海地区广泛分布的坡积土-强风化岩成层边坡为背景,基于饱和-非饱和渗流理论,通过一维、二维成层边坡有限元渗流计算,得到在不同降雨条件下坡积土层厚度对含水率、孔隙水压力沿高程分布的影响规律,以及坡积土层厚度、边坡坡比对二维边坡不同截面的降雨入渗深度的影响.研究结果表明:降雨入渗深度与坡积土层厚度成正比,且坡积土厚度对含水率的影响程度与降雨强度有关;降雨强度与边坡土层饱和渗透系数的关系决定孔隙水压力的分布特征;坡积土层越厚,其各个截面的降雨入渗深度越大,而且边坡坡比越大,其底部截面的降雨入渗深度越大,边坡上部及中部截面受坡比影响较小;边坡土层结构对其在降雨作用下的含水率分布变化影响显著.
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