摘要
我国是一个滑坡灾害频发的国家,众多事实表明:降雨是影响边坡稳定性,导致边坡失稳的最主要和最普遍的环境因素,是浅层滑坡的触发因素。为了更好地对降雨诱发浅层滑坡进行研究,采用非饱和土VG模型与改进的Green-Ampt入渗模型对Mein-Larson降雨入渗模型进行改进,并结合无限边坡提出了一个降雨诱发浅层滑坡的简化计算模型。与以往提出的简化计算模型相比,该模型既考虑了坡面倾斜的影响,又考虑了非饱和土的特性,并可用于两种降雨形式下的边坡浅层稳定性估算,具有更广的应用范围。通过与有限元得到的结果进行比较可得:在不同降雨条件下,该计算模型得到的各项结果与数值解是接近的,安全系数计算结果是偏于安全的,因此,可将该计算模型用于降雨诱发浅层滑坡的近似估算;该计算模型公式简单,便于计算,计算效率较高。
Landslides are common geological hazard problems in China;many facts indicate that the rainfall is the main and common environmental factor controlling the instability of slope and triggering shallow landslides.In order to do better research on rainfall-induced shallow landslides,Mein-Larson model is developed based on VG model and modified Green-Ampt infiltration model;then combined with infinite slope stability model,a simplified calculation model is proposed for analyzing rainfall-induced shallow landslides.Compared with the simplified calculation model proposed before,the effect of slope and the characteristics of unsaturated soil are taken into account in this model;it can be used for analyzing rainfall-induced shallow landslides under two different rainfall patterns;and it has a wider range of applications.Compared with the results of FEM,conclusions can be drawn as follows： the results of the calculation model agree with that of FEM;and the safety factor is somewhat safe;so it can be used for analyzing rainfall-induced shallow landslides;the calculation model has simple formula,higher computational efficiency.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2012年第5期1485-1490,共6页
Rock and Soil Mechanics
基金
国家自然科学基金资助项目(No.40872179)
关键词
降雨
入渗模型
无限边坡
非饱和土
浅层滑坡
rainfall
infiltration model
infinite slope
unsaturated soils
shallow landslide
