房柱式残采区蹬空开采可行性研究

Research on the Feasibility of Over-goaf Mining with Room and Pillar Mining in Residual Mining Area

以大同精通兴旺整合重组煤矿为研究背景,首先采用理论计算初步判定了9#煤层蹬空开采的可行性和12#煤层残采区煤柱稳定性,然后借助钻孔注水和钻孔窥视等技术从现场实测的角度揭示了9#煤层蹬空开采的岩层结构特征。研究结果表明:房柱式残采区上覆岩层冒落带高度距离不超过10m,裂隙带高度约为25m,9#煤层位于12#煤层房柱式开采形成的弯曲下沉带,岩层仅出现内部损伤,未出现大范围台阶下沉,整体性和完整性较好,可以进行蹬空开采。

Based on the research background of Datong Jingtong Xingwang Coal Mine,which is a reorganized coal mine,the feasibility of 9~#coal seam over-goaf mining and the coal pillar stability in 12~#coal seam residual coal mining area are first determined by theoretical calculation,and then the rock stratum structure in the over-goaf mining of 9~#coal seam is revealed using borehole flooding and borehole peeping.The results show that the overlying strata height in the room and pillar residual mining area is within 10 m,the height of the fracture zone is about 25 m,and the 9~#coal seam is located in the curved subsidence zone formed by the 12~#coal seam room and pillar mining.The rock stratum has only internal damage,with good integrity and no large-scale step subsidence,the over-goaf mining is feasible.