缓倾斜煤层临空巷道冲击地压防治研究

Research on rock burst prevention and control of near goaf sideroadway in gently inclined coal seam

针对在缓倾斜煤层中工作面临空侧巷道的冲击矿压问题,研究分析了影响临空侧巷道冲击地压的主要因素,采用仿真模拟得出了远场矿震和近场强矿震作用下临空侧巷道的动载作用过程。通过实际应用表明:采用顶板预裂爆破、大直径钻孔卸压和煤体爆破卸压等综合防治措施,结合“锚索+双网+大托盘”的联合支护方式后,104 J以上大能量事件发生频次降低了50%以上,周期来压步距平均值由17.84 m降至11.98 m,来压范围减少了50%以上,有效降低了临空侧巷道冲击地压风险。

In view of the rock burst of the near goaf side roadway working face in gently inclined coal seam,the main factors affecting the rock burst of the near goaf side roadway was studied and analyzed.The dynamic load action process of the near goaf side roadway under the action of far field mine earthquake and near field strong mine earthquake was obtained by simulation.The practical application shows that:After adopting comprehensive prevention and control measures such as roof pre-cracking blasting,large-diameter drilling pressure relief and coal body blasting pressure relief,combined with the combined supporting mode of“anchor cable+double net+large tray”,the occurrence frequency of large energy events over 104 J has been reduced by more than 50%,the average periodic weighting step space has been reduced from 17.84 m to 11.98 m,and the pressure range has been reduced by more than 50%.The risk of rock burst of near goaf side roadway is effectively reduced.