中文摘要：

Green-Ampt入渗模型是以湿润锋至入渗面间的土体均达到饱和含水率为基础建立的,忽略非饱和区存在的实际情况,造成Green-Ampt模型计算结果不准确。针对这一情况,基于入渗分层假设,通过建立达西定律和雨水入渗质量守恒方程,推求入渗深度和时间的关系,并将其引入边坡安全系数分析。研究结果表明：入渗深度和时间的关系中,分层假设模型更贴近实测值,总体吻合性较高。同一深度,分层假设模型的入渗率始终高于Green-Ampt模型,但对于同一时刻,两模型入渗率相接近。同时,边坡安全系数中,以Green-Ampt模型计算的边坡安全系数过于保守,分层假设模型比Green-Ampt模型的边坡入渗深度和失稳时间有明显的延缓。正确分析土体内部入渗情况,将有助于准确预报边坡滑坡失稳,减小边坡加固,以免造成经济浪费。

英文摘要：

Green-Ampt infiltration model is set up based on saturation moisture content which is from wetting front to the infiltration surface, regardless of the unsaturated zone at actual situation, which makes Green-Ampt model calculation results inaccurate. In view of this situation, based on infiltration stratified hypothesis, ascertains the relationship between the infiltration depth and time was ascertained through establishing Darcy＇s law and rainfall infiltration mass conservation equation, and was introduced into the slope safety factor analysis. The result shows that stratified hypothesis model is closer to the measured value and has a higher total anastomosis between the infiltration depth and time relationship. For same infiltration depth, stratified hypothesis model of infiltration rate is always higher than Green-Ampt model＇s, but at the same infiltration time, two model infiltration rates are close. At the same time, the calculation of slope safety factor of the Green-Ampt model is too conservative, and the slope infiltration depth and instability time of stratified hypothesis model is obviously behind Green-Ampt model. The correct analysis of the internal soil infiltration will help us to accurately forecast the landslide slope instability, so as to reduce unnecessary slope reinforcement to cause economic waste.