采空区下伏巷道掘进冲击地压机理及防治技术研究

Mechanism and prevention technology of rock burst in underlying roadway excavation of goaf

  • 摘要:
    目的 针对相邻煤层采空区下伏巷道掘进过程中冲击地压灾害频发的问题,
    方法 以门克庆煤矿3107工作面主运巷为工程背景,通过理论分析、数值模拟与现场实践相结合的方法,研究了采空区下伏巷道围岩应力分布特征及冲击地压发生机理。
    结果 研究表明,保护层开采后,下伏煤层垂直应力经历“升高−降低−稳定”三阶段演化,采空区边界外70 m范围内形成高应力集中区,是冲击地压的主要诱因。基于此,提出“应力分区识别、分级卸压调控”的防治技术体系,采用“煤柱区域大直径钻孔+顶板预裂爆破”组合卸压方案。现场应用表明,该技术有效降低了巷道围岩变形量,未发生冲击地压事故。
    结论 研究成果可为类似条件下煤矿冲击地压防治提供理论依据与技术参考。

     

    Abstract: In light of the frequent occurrence of rockburst disasters during the excavation of underlying roadways in adjacent coal seam goaf, this study takes the main transportation roadway of the 3107 working face in Menkeqing Coal Mine as the engineering background. Through a combination of theoretical analysis, numerical simulation, and field practice, the stress distribution characteristics of surrounding rock and the mechanism of rockburst under the goaf are investigated. The research shows that after protective seam mining, the vertical stress in the underlying coal seam undergoes a three-stage evolution of "increase-decrease-stabilization." A high-stress concentration zone forms within a 70-meter range outside the goaf boundary, which is the main inducing factor of rockburst. A prevention and control technology system of "stress zoning identification and hierarchical pressure relief regulation" is proposed, adopting a combined pressure relief scheme of "large-diameter drilling in coal pillar areas + roof pre-splitting blasting." Field application demonstrates that this technology effectively reduces roadway surrounding rock deformation, without rockburst accidents occurring. The research results provide theoretical foundations and technical references for rockburst prevention under similar conditions in coal mines.

     

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