渗流作用下花岗岩类土质路堑边坡稳定性分析

以南厦高速公路K36+600～+700段类土质路堑边坡为例,采用Slide软件对其是否考虑渗流工况下的边坡稳定性进行定量计算对比,评估其治理措施效果,并进一步对边坡渗流敏感性进行分析.研究表明:①考虑渗流作用的边坡稳定安全系数Fs=0.963比不考虑渗流的Fs=1.252低了0.289,说明渗流对边坡的稳定性非常不利;②加固处治后,边坡的稳定安全系数只提高了0.128,边坡仍处于欠稳定状态;而后增加排水工程,边坡安全系数提高了0.232,体现地下水对边坡稳定性影响明显,排水工程十分必要;③在不同水位下,考虑加固与排水工程前后的边坡稳定性对比结果表明:安全系数与水力梯度成反比,水位越低,安全系数越高,边坡越稳定.

Analysis on the granitoid soil cut slopes stability under the action of seepage

This article use soil cut slope at Nanxia highway K36+ 600 ~+700 segments as the example,contrasting on the quantitative calculation of stability of the slope according to whether seepage was taken in to consideration or not,then estimate the effect of management measure.In addition,it analyses on the seepage sensibility of the slope.The research shows that: ① the safety factor of the slope under considering seepage which is 0.963 is lower of 0.289 than that without considering seepage,that to say seepage is very bad on the slope stability;② after reinforce,the safety factor of slope stability just increase 0.128,the slope is still under unstable state,after add drainage engineering,the safety factor of the slope increase 0.232,it shows that groundwater affects obviously on the slope stability,drainage engineering is very necessary;③ contrasting on the slope stability under considering reinforce and drainage engineering with different water level,we got that,the buckling safety factor is inversely proportional to hydraulic gradient,the lower water level,the higher the safety factor,and the greater the slope stability