降雨条件下滇西红层软岩高路堤稳定性分析

Analysis of High Embankment Stability of Red-bed Soft Rock in West Yunnan under Rain Falling

以云南施梦公路特高路堤边坡为研究对象,充分考虑滇西红层软岩的工程特性,通过建立FLAC有限差分计算模型,研究不同降雨强度和降雨持时对滇西红层软岩特高路堤边坡稳定性的影响及其形变规律。结果表明:边坡的安全系数随着降雨的持续有所降低,且降雨强度越强,边坡稳定的安全系数降低越多;随着降雨强度增大和降雨持时的增长,滑动面沿坡面浅层发展,由坡中向坡脚发展,边坡稳定安全系数有所降低,且其降低幅度有所增加。其成果将为滇西红层软岩特高路堤边坡防护设计提供依据。

The slope of super-high filled embankment of the Shidian-Mengding Highway in Yunnan Province being taken as the study object, with full considerations on engineering characteristics of red-bed soft rock in western Yunnan, by establishing FLAC finite difference calculation model, the influence of different rainfall intensity and duration to the slope stability and its deformation law are studied. The results show that the safety factor of slope reduces with continuous rainfall, and the stronger of rainfall intensity, the larger decreasing of the safety factor of slope stability is, and along with the rainfall intensity and duration increase, sliding surface develops along the slope surface and from central slope to the slope foot, the slope stability safety coefficient reduces with increasing reduction amplitude. The results will provide basis for the slope protection design of the mentioned project in western Yunnan.