眼前山露天矿转地下开采边坡大变形模式数值模拟

Numerical Simulation of Rock Slope on Large Deformation Mode for Transition from Yanqianshan Open-pit to Underground Mining

针对眼前山铁矿露天转地下开采条件下的边坡岩体的变形、破坏和稳定性问题,采用FLAC大变形模式分析了矿体开采不同深度下的露天边坡变形破坏特征。开挖模拟显示北帮软岩边坡易产生大量滑落,但一般不会形成突然快速的滑坡,对地下开采的安全影响不大,但大量小颗粒碎石补充岩石覆盖层,对控制损失贫化指标不利。南帮硬岩边坡岩体开采初期未出现较大的变形和整体滑移。

The rock slope will take place large deformation,damage and stability issues during the transition from Yanqianshan open-pit to underground mining. The mine excavation characteristics in different depth was analyzed with FLAC large deformation mode. The soft rock mass in North slope collapse easily and heavily. But the sliding is not rapid usually,and has a less influence to underground mining. But large number of small crushed stones will fill the rock layer, which is unfavorable to control the dilution and loss index. The hard rock mass in south slope have not appeared large deformation and sliding during primary mining.