大采深厚煤层工作面冲击地压综合防治技术研究

    Research on comprehensive control technology of rock burst in deep coal seam working face in large mining

    • 摘要: 针对2303综采工作面因煤层埋藏深、煤层赋存厚且回风巷在工作面回采期间受临近工作面采空区顶板二次破断及现采工作面采动动压相互叠加应力作业影响,极易发生冲击地压灾害,通过对工作面发生冲击地压主要影响因素及发生机理进行综合理论分析,结合矿井实际开采情况,针对性提出了监测预警、巷道补强加固、煤层注水、大孔径钻孔卸压等防冲卸压综合措施,经现场应用,采取综合防冲卸压措施后,在工作面回采过程中,通过微震监测系统监测到工作面发生微震单次能量由未采取措施前的6.1×104 J/d下降到2.4×103 J/d,微震能量值一般处于102 J/d左右,同时,通过围岩变形观测发现,临空侧巷道围岩变形量由未采取措施前巷道最大收缩量72%下降至38%,超前工作面100~120 m范围内的巷道顶板应力值由原来最大19.4 MPa下降至7.6 MPa,防治效果达到预期目的。

       

      Abstract: In response to the problem of rockburst disasters that are prone to occur in the 2303 fully mechanized mining face due to the deep burial and thick occurrence of coal seams, as well as the secondary breakage of the roof of the adjacent goaf and the overlapping stress operation of the mining dynamic pressure of the current mining face during the mining period, comprehensive theoretical analysis was conducted on the main influencing factors and mechanisms of rockburst disasters in the working face. Combined with the actual mining situation of the mine, targeted measures were proposed to prevent rockburst and pressure relief, such as monitoring and early warning, roadway reinforcement and reinforcement, coal seam water injection, and large-diameter drilling pressure relief. After on-site application, comprehensive rockburst and pressure relief measures were taken. During the mining process of the working face, a microseismic monitoring system was used to monitor the energy of a single microseismic event in the working face. Before taking measures, the energy of 6.1 × 104J/d decreased to 2.4 × 103J/d, and the microseismic energy value is generally around 102J/d, At the same time, through observation of surrounding rock deformation, it was found that the deformation of the surrounding rock in the goaf side roadway decreased from 72% of the maximum shrinkage of the roadway before measures were taken to 38%. The stress value of the roadway roof within the range of 100-120 meters ahead of the working face decreased from the original maximum of 19.4 MPa to 7.6 MPa, and the prevention and control effect achieved the expected goal, providing experience for the prevention and control of rockburst in mines in the future.

       

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