Research on rock burst prevention and control of near goaf side roadway in gently inclined coal seam
曹立平1
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作者信息
1. 晋能控股煤业集团挖金湾虎龙沟煤业有限公司,山西 朔州 038399
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摘要
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.
Abstract
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 ana-lyzed.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 occur-rence frequency of large energy events over 104 J has been reduced by more than 50%,the average pe-riodic 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 re-duced.
关键词
缓倾斜煤层/冲击地压/临空侧巷道/动静载荷/联合支护
Key words
gently inclined coal seam/rock burst/near goaf side roadway/dynamic and static load/com-bined supporting
维普
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