中文摘要：

强降雨作用下基岩型层状边坡易发生失稳破坏,给人们生命财产造成重大损失。为探索基岩型层状边坡的降雨入渗过程,以Green-Ampt入渗模型为基础,考虑了边坡几何特征及饱和带渗流作用,得到了边坡不同入渗阶段入渗率和湿润峰深度的计算式,建立了适用于基岩型层状边坡的降雨入渗计算模型;在分析基岩型层状边坡稳定性时,考虑了饱和带的渗流作用,联合降雨入渗模型与极限平衡法,分析了基岩面与湿润峰面稳定性的变化规律,得到了计算基岩型层状边坡安全系数的解析表达式;结果表明,该模型的计算与试验结果具有一致性。利用该计算模型与传统计算方法对张家湾滑坡进行了强度为30 mm/h的降雨入渗与稳定性分析,得到了不同计算方法下张家湾滑坡湿润峰深度及安全系数随降雨历时增加而发生的变化规律,结果表明该计算模型在分析基岩型层状边坡稳定性时优于传统分析方法。

英文摘要：

The failure of bedrock laminar slope mostly happens due to heavy rainfall; and it causes huge losses to people＇s lives and property. To explore the process of rainfall infiltration into bedrock laminar slope under heavy rainfall, a new rainfall infiltration model for this slope is built and then a formula of calculating infiltration rate and wetting front depth about slope is obtained for different stages based on Green-Ampt infiltration model. The geometric characteristics of slope and the seepage of saturation zone are considered in this new model. Based on the rainfall infiltration model and limit equilibrium method, an analytical expression of safety factor is developed for bedrock laminar slope under different rainfall durations by considering the seepage of saturation zone. The expression is used to analyze the variation of the surface of bedrock and the surface of wetting front. It is shown that the calculated results have a high consistency with that of slope model test. Moreover, the proposed procedure and the traditional method are employed to analyze the process of rainfall infiltration and the regularity of stability of Zhangjiawan landslide under the rainfall intensity of 30 mm/h. The variations of wetting front depth and safety factors with the increase of rainfall duration are obtained. The results show that, the proposed procedure is superior to traditional method in analyzing the stability of bedrock laminar slope.