东山铁矿露天采场改建尾矿库边坡稳定性研究

以东山铁矿露天采场地质环境治理为背景，针对该采坑现状边坡及改造成尾矿库后终期边坡稳定性问题，通过矿山现状实测地形图及现场实地踏勘选取典型边坡剖面，利用Geo-studio软件中的SLOPE/W模块，对露天采场的边坡稳定性进行分析。通过数值模拟分析，得出所选典型剖面的边坡最危险滑裂面的位置以及在各种工况条件下的边坡安全系数，通过对比采用各种极限平衡分析方法所得的结果，东山露天采场边坡的最小安全系数为1.201，满足相关规范要求。研究结果表明：在拟定工况条件下采坑边坡大部分边坡剖面处于稳定状态，个别部位处于基本稳定状态，即总体安全稳定性有保障，但局部部位存在小规模崩塌、落石的可能性。总体而言，该露天采坑在改建成为尾矿库的过程中边坡安全性是有保障的。

Study on the Slope Stability of the Tailing Pond Built at Open-pit Stope in Dongshan Iron Mine

With the geological environment management in Dongshan Open Pit as the background,and in view of the slope stability problems at the present open pit and the tailings pond that are changed from the pit,the measured topographic maps of the mine status and the field reconnaissance were adopted to select a typical slope section.Geo-studio software slope /W module were adopted to analyze the slope stability of the opencast stope.Through the numerical simulation analysis,the most dangerous sliding surface position of the selected typical section and the slope safety factor under various working conditions are obtained.Comparing with the results from the limit equilibrium analysis,the minimum safety factor of slope in Dongshan open pit is 1.201,which meets the specification.The research results indicated that most of slope sections are in stable state under a certain working condition.Some parts are basically in stable.That is,the slopes of the tailing pond are overall in security but the collapse and rock-fall possibly exist in some small parts.In general,the slope security can be guaranteed during the process of the tailing pond changed from open pit.