School of Resources and Environmental Engineering, Inner Mongolia University of Technology
Inner Mongolia Engineering Research Center of Geological Technology and Geotechnical Engineering, Inner Mongolia University of Technology

老采空区受矿区早期采煤方法的限制,具有较强的隐匿性,很难得到有效治理,为其地表构筑物建设带来巨大挑战。以昌盛煤矿房柱式老采空区治理为工程背景,采用理论分析、钻孔勘探、数值模拟以及现场瞬变电磁勘查等方法,分析了房柱式采空区覆岩裂隙特征;判别了房柱式采空区上地表的稳定性,数值模拟进一步分析得出,在新的单位载荷作用下,采场中央遗留煤柱将发生活化失稳,引起采场所有煤柱发生多米诺骨牌式破坏,进而导致房柱式采空区地表发生失稳。基于对房柱式采空区稳定特征及浆液在房柱式采空区流动的特性提出了散点式注浆充填方案,给出了浆液配比及注浆工艺。现场瞬变电磁勘查结果表明,散点式注浆充填法能有效实现老采空区的充分均匀充填,注浆效果整体良好,同时该方法可为对类似老采空区地表治理提供参考。

The concealment of old mine goafs, stemming from the limitations of early coal mining methods, poses significant challenges to the effective management and construction of surface structures in these areas. This study, set against the engineering backdrop of managing the old room-pillar goaf in Changsheng Coal Mine, employed theoretical analysis, drilling exploration, numerical simulation, and on-site transient electromagnetic surveys to examine the characteristics of overburden rock fractures within room-pillar goafs. It assessed the stability of the surface over the room-and-pillar goaf, with numerical simulations indicating that under new unit loads, the coal pillars left in the center of the stope became activated and destabilized. This led to a domino-like failure of all pil-lars in the mining site, resulting in the surface instability of the room-and-pillar goaf. Drawing on the identified stability characteristics of the room-and-pillar goaf and the flow properties of slurry within such goafs, the study proposed a dispersed point grouting filling strategy, detailing the slurry mixture and grouting techniques. Results from field transient electromagnetic surveys demonstrated the effectiveness of the dispersed point grouting meth-od in achieving comprehensive and uniform filling of the old mine goaf, with generally positive outcomes. This method also offers valuable insights for the surface management of similar old mine goafs, highlighting its im-portance for engineering applications and environmental safety.

内蒙古自治区自然科学基金资助项目(2021MS04010);内蒙古自治区直属高校基本科研业务费资助项目(JY20220169)

刘欣欣,齐学元,耿俊俊.浅埋房柱式采空区煤柱稳定性及控制研究[J].采矿与岩层控制工程学报,2024,6(2):023537.

LIU Xinxin, QI Xueyuan, GENG Junjun. Stability and control of room-and-pillar mined-out area in shallow coal seam[J]. Journal of Mining and Strata Control Engineering, 2024, 6(2): 023537.