厄瓜多尔某水电站左坝肩开挖边坡的稳定性评价

Evaluation on the Excavation Slop Stability of Left Abutment of a Hydropower Station in Ecuador

以厄瓜多尔某水电站左坝肩1 518 m高程以上开挖边坡为例,结合开挖后地表地质测绘成果,前期钻孔勘探、试验结果和最新的水平取芯钻孔结果,应用Swedge(Demo)软件对边坡开挖后可能形成的不稳定块体进行稳定性分析,根据开挖前、后的地质情况,对倾倒变形体的稳定性进行判断,并与现场变形监测结果进行对比.结果表明:无论是天然边坡,还是开挖后的边坡,均不存在大规模的深层滑动问题,左坝肩边坡整体处于稳定状态,现场变形监测结果也表明了这一点.最后根据分析评价结果提出了边坡的处理措施.

Taking excavation slop above 1 518 m elevation in the left abutment of a hydropower station in Ecuador as an example,combining with the results of excavation surface geological survey,previous drilling exploration,experiments and latest horizontal core borehole,the software Swedge（Demo） was applied to analyze the stability of possible formed unstable blocks after slop excavation.According to the geological conditions before and after excavation,the stability of toppling deformation bodies was judged and compared with the monitoring results of in-situ deformation.The results show that the large-scale deep-layer slides don＇ t exist in natural slopes and excavation slopes,and the overall slope in the left abutment is stable,which is also verified by the monitoring results of in-situ deformation.In the end,the treatment measures for slopes are proposed according to analysis results.