某露天矿边帮开采协同地下空区处理方案设计

Scheme Design of Sidewall Mining Combined with Underground Goaf Treatment in an Open-pit Mine

国内某露天矿山北部边坡下存在大量空区,间接影响地表开采范围达50 m×200 m(宽×长)。考虑当前技术经济条件,露天开采协同空区处理方案设计包括单层空区处理、侧翼空区处理及最终台阶再造。针对侧翼多层空区,首先采用单层采空区处理的方法崩落第一层空区,将台阶推进至下一层采空区侧翼,再布置斜孔崩落侧翼空区顶板。爆破后空区周围矿石基本回收,不影响下级台阶开采。

There are a lot of goaf under the northern slope of an open-pit mine in China,which indirectly affect the surface mining area of 50 m×200 m(width×length).Considering the current technical and economic conditions,the design of open-pit mining collaborative goaf treatment scheme includes single-layer goaf treatment,flank goaf treatment and final step reconstruction.For the wing multi-layer goaf,the first layer of goaf is collapsed by single layer goaf treatment method,and the step is pushed to the flank of the next layer of goaf,and then the inclined hole is arranged to collapse the roof of the wing goaf.After blasting,the ore around the empty area is basically recovered without affecting the lower bench mining.