复杂地质条件近距离煤层上行开采技术研究与实践

Technology of Close-distance Coal-seam Upward Mining under Complex Geological Condition

永新煤矿A6煤层和A6上煤层最小层间距19.8m,利用比值分析法、"三带"判别法、数理统计分析法、围岩平衡法进行上行开采可行性分析,判别A6上煤层位于A6煤层覆岩准平衡带及中裂隙亚带内。利用UDEC建立二维离散元模型,模拟分析了A6煤层开采后覆岩运移及应力变化情况,对理论分析结论进行了验证。研究结果表明A6上煤层可进行上行开采。

The minimum distance of A6 and A6-top coalseam in Yongxin Colliery is 19. 8m. Applying ratio analysis, “3-zone” discrim-inance method, mathematical statistics and surrounding rock equilibrium method to analyzing feasibility of upward mining, it was ob-tained that A6-top coalseam lies within quasi-equilibrium zone and middle fissure zone. Surrounding rock movement and stress variation after mining A6 coalseam was simulated with UDEC software and verified theoretical analysis result. It was proved that upward mining A6 coalseam was feasible.