深井强采动工作面煤柱及回采巷稳定性控制技术研究

Research on Stability Control Technology of Coal Pillar and Mining Roadway in Deep Well Strong Mining Working Face

【目的】深井大采高工作面沿空掘巷后所留设的煤柱稳定性差,沿空巷道在服务周期内受集中应力及采动影响作用变形严重,围岩变形控制难度大。对深井强采动工作面煤柱及回采巷稳定性控制技术进行研究,可有效解决上述问题,实现煤炭资源安全高效开采。【方法】以刘庄煤矿一水平采区为工程背景,通过试验及现场调研对其进行地质力学评估,确定一水平采区围岩力学特性及松动破坏范围,通过数值模拟分析煤柱及沿空巷道破坏变形的主要原因。【结果】结合数值模拟研究提出“爆破切顶与注浆加固”相结合的围岩稳定性控制技术,通过理论分析确定了爆破切顶的高度为23.6 m,炮孔的间距为1.5 m。【结论】进行了现场工业性试验并对应用效果进行了监测,现场试验监测结果表明,采用爆破切顶与注浆加固控制技术后,131304工作面煤柱受采动影响后稳定性良好,131306沿空掘巷围岩稳定性得到有效控制,研究结果可为同类工程提供参考。

[Purposes]The stability of the coal pillars left behind by the goaf excavation in the deep mining high mining face is poor.The goaf excavation is severely deformed due to concentrated stress and mining influence during the service cycle,making it difficult to control the deformation of the surrounding rock.The research on stability control technology for coal pillars and mining roadway in deep well strong mining working face can effectively solve the above problems and achieve safe and efficient mining of coal resources.[Methods]This article takes the first level of Liuzhuang Coal Mine as the engineering background.Through laboratory experiments and on-site investigations,the geological mechanics evaluation of the first level mining area was carried out,and the mechanical characteristics and loosening and failure range of the surrounding rock of the first level were mastered.The main reasons for the failure and deformation of coal pillars and goaf tunnels were analyzed through numerical simulation.[Findings]A rock stability control technology combining"blasting top cutting and grouting reinforcement"was proposed through numerical simulation research.Through theoretical analysis,the height of the blasting top cutting was determined to be 23.6 m,and the spacing between the blast holes was 1.5 m.[Conclusions]On-site industrial experiments were conducted and the application effect was monitored.The monitoring results of the on-site experiments showed that after using blasting top cutting and grouting reinforcement control technology,the stability of the coal pillar in the 131304 working face was good after being af fected by mining,and the stability of the surrounding rock in the 131306 goaf excavation roadway was ef fectively controlled.The research results can provide reference for similar projects.