降雨入渗作用下土质边坡稳定性分析

Soil Slope Stability Analysis under the Condition of Rainfall Infiltration

为探讨降雨入渗条件下土质边坡稳定性的变化规律,研究了降雨强度、降雨历时、前期降雨、土体渗透特性以及降雨类型等因素对边坡稳定性的影响。研究结果表明,边坡的安全性随着降雨强度和降雨历时增加而不断降低;前期降雨过程通过改变后期降雨的初始含水量来间接影响边坡的稳定性,并随着降雨时间间隔的增长呈现出先降低后升高的趋势;土体渗透特性对边坡稳定性起着关键作用,土体渗透系数越大,边坡安全性能也随之增强;与短时强降雨相比,长时弱降雨对边坡的危害程度更大。

This paper discusses the change law of slope stability under rainfall infiltration condition. The rainfall intensity and duration and prophase rainfall are comprehensively studied,influence of soil infiltration characteristic factors on slope stability is comprehensively studied,the comparison and analysis of the short time heavy rainfall and long weak rainfall characteristics of slope are emphasized. Analysis results show that the safety of the slope is reduced with the increase of rainfall intensity and duration,safety factor is used as the growth of the late time interval before showing a lower growth trend.Slope safety performance decreases with the increase of permeability characteristics in strengthening;short heavy rain to slope top soil is likely of saturation,and influence of long weak rainfall on the slope soil depth is bigger,stability is greatly reduced,but long weak rainfall of landslide hazard degree is higher.