考虑降雨特征的浅层边坡稳定性分析  

An Analysis of Stability of Shallow Slopes Considering Rainfall Characteristics

作　　者：韩金明[1,2] 肖明[1,2] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,武汉430072 [2]武汉大学水工岩石力学教育部重点实验室,武汉430072

出　　处：《中国农村水利水电》2011年第5期105-108,112,共5页China Rural Water and Hydropower

基　　金：国家自然科学基金重大研究计划项目(90715042);国家杰出青年科学基金资助项目(50725931);"十一五"国家科技支撑计划项目(2008BAB29B01)

摘　　要：由降雨诱发的残积土滑坡在亚热带和热带地区非常普遍,产生此类滑坡的主要原因是雨水入渗使斜坡内非饱和区材料抗剪强参数和基质吸力降低导致了土体抗剪强度的减小。基于Mein-Larson模型,用一种近似的显式方法模拟入渗过程,得出了实际入渗率和湿润锋深度随时间变化规律,在此基础上,采用考虑基质吸力的极限平衡方法进行了边坡稳定性分析。计算结果表明实际入渗率在积水之前为降雨强度,之后逐渐减小;湿润锋深度随时间成近似线性变化;边坡安全系数随降雨的入渗而显著下降。The rainfall-induced landslide in residual soil is very common in tropical and subtropical regions.This type of landslide is mainly due to the reduction of anti-shear parameters and matric suction in the unsaturated area of slope caused by rainfall infiltration,thus lowering the anti-shear capacity of soil.Based on Mein-Larson model,an explicit method is presented to approximately simulate the process of infiltration.Variation laws of infiltration rate and depth of the wetting front with time are obtained.On this basis,the limit equilibrium method considering the matrix suction is used to analyze the influence of rain infiltration on slope stability.The results show that the actual infiltration rate is equal to rainfall intensity before ponding,and then gradually decreases.The depth of the wetting front observes an almost linear trend with time.The safety factor decreases significantly due to rainfall infiltration.

关 键 词：降雨入渗 湿润锋 Mein-Larson模型 边坡稳定 

分 类 号：TV671[水利工程—水利水电工程]