针对在分析降雨对滑坡稳定性的影响时，不论降雨强度大小和持续时间长短，均将滑体土视为全面饱和进行处理的问题。基于非饱和土一维垂直入渗理论，依据 Green-Ampt入渗模型和 Philip入渗模型参数之间的联系， 对两个模型进行改进，既解决了 Green-Ampt入渗模型无法表达成以时间 t为自变量的显式形式的缺陷，也解决了 Philip入渗模型不能单独用来计算湿润锋深度的问题，还为分析暴雨作用下的滑坡稳定性提供依据。以重庆市某土质滑坡在50 a一遇连续3 d暴雨作用下的滑坡体为例，用改进的Philip入渗模型计算了滑体土饱和湿润锋深度、 滑坡稳定系数及滑坡推力，并将其与按滑体土全面饱和的经验计算结果进行对比，研究结果表明：滑坡稳定系数明显提高，滑坡推力显著减小，该改进模型可为滑坡稳定性分析和设计提供借鉴。
When the influence of rainfall on the stability of landslide is analyzed，the sliding-body soils are roughly regarded as fully saturated ignoring the rainfall intensity and duration. In this paper，based on the theory of one-dimensional vertical infiltration of unsaturated soils，considering the connection of parameters of the Green-Ampt infiltration model and the Philip infiltration model，those models were improved. This new method not only deals with the defect that the explicit form can not be expressed with time t as independent variable using the Green-Ampt infiltration model，but also solves the problem that the depth of wetting front can not be calculated separately using the Philip infiltration modelod. Which provides a theoretical basis for the stability analysis of landslide disturbed by the rainstorm. A case study of a soil landslide induced by the action of 50-year continuous 3 d rainstorm in Chongqing was carried out. The improved Philip infiltration model was used to calculate the saturated wetting front depth，landslide stability coefficient and landslide thrust.The results was compared those from the empirical method that sliding-body soil was fully saturated. The research shows that the landslide stability coefficient is significantly improved，while the landslide thrust is significantly reduced. The improved model can provide reference for landslide stability analysis and design.