The hazard of shallow landslide is very common,especially in the areas with abundant rainfall,and has caused severe losses every year.For the propose of exploring the effect of the intense rainfall infiltration on the stability of shallow landslide,the function relationship between infiltration depth and rainfall duration is simplified based on the previous study on the Green-Ampt infiltration model,and combined with the shallow landslide' s characteristics of small depth and length radio.In order to evaluate the stability of shallow landslide,the seepage force and matrix suction are taken into account,the limit equilibrium method and the micro-element method are used,and the stability coefficient at the sliding zone and the wet front are both analyzed.Combining the improved infiltration Model,the relationship between the safety factor and the duration of rainfall is given for the landslide whose sliding surface is not parallel to the slope.In addition,the applicability of the evaluation model of shallow landslide stability is verified by numerical simulation.Finally,the improved model is used to analyze the Xiaowan No.3-B3 slope,and the superiority and stronger applicability of the improved model of shallow landslide stability analysis under heavy rainfall are demonstrated by comparison with the traditional method.%浅层滑坡灾害在我国较为常见,尤其是降雨充沛地区,每年都会造成严重的损失.为研究强降雨入渗作用对浅层滑坡稳定性的影响,在前人对Green-Ampt (GA)入渗模型研究的基础上,结合浅层滑坡深度与长度之比比较小的特性,简化了入渗深度与降雨时长的函数关系式.在进行浅层滑坡稳定性评价时,考虑了渗流力和基质吸力,采用了极限平衡思想和微元思想,同时分析了滑带面处和湿润锋面处的稳定性系数,结合改进的入渗模型,给出了适用于滑带面不平行于坡面的滑坡的安全系数与降雨持续时间的函数关系式,并通过数值模拟方法验证了模型的适用性.最后利用改进模型对小湾3号B3滑坡进行分析,并通过与传统方法的对比展现了强降雨条件下浅层滑坡稳定性分析改进模型的优越性和更强的适用性.
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