考虑渗流作用的城门山铜矿临湖露天开采边坡稳定性研究

Stability Analysis of Lakeside Open-pit Slope in Chengmenshan Copper Mine by Considering Seepage Influence

基于地质勘探资料,建立了城门山铜矿临湖露天开采边坡的地质模型,对临湖露天开采边坡进行了考虑湖水在不同渗流路径和不同渗透压力作用下的稳定性分析。研究结果表明:湖水渗流大大降低了边坡安全系数,随着湖水水位增大,边坡滑坡范围越大,边坡安全系数越低。湖岸与露天采坑之间的距离对边坡稳定性有较大影响,湖—坡距离D越大,边坡安全系数越高,当边坡安全系数取1.2时,考虑湖水渗流条件下湖—坡最小安全距离为60 m。

Based on the geological exploration data,the geological model of the open-pit slope in Chengmenshan Copper Mine is established,and the stability of the lakeside open-pit slope is analyzed by considering the different seepage paths and different seepage pressures of lake water. The results show that the seepage of lake water greatly reduces the safety factor of slope. With the increase of lake water level,the scope of slope landslide becomes larger,and the safety factor of slope is lower. The distance between lake shore and open pit has great influence on slope stability. Compared with the safety factor of slope under the same lake water level at different distances,the larger the lake-slope distance D is,the higher the slope safety factor is. Based on the above study results,when the allowable safety factor is 1.2,the minimum safe distance between lake and slope is 60 m under the condition of lake water seepage.