【摘要】 千秋煤矿21112工作面上覆坚硬巨厚砾岩层,属强冲击特厚煤层,掘进面煤体应力较高。通过在掘进面正前方实施大直径卸压钻孔和深孔卸压爆破,有效降低了掘进面前方煤体应力,保障了掘进期间的安全生产。这两项措施的合理配合应用,在21112工作面取得了良好的卸压效果。更多还原

【Abstract】 21112 working face is overlying hard thick gravel stratum in Qianqiu Coal Mine,and the coal seam belongs to thick coal seam with large rock burst trend,the stress of coal body on driving face is high.Through the implementation of large diameter pressure-relief hole and deep-hole pressure-relief blasting in front of driving face,the stress of coal body in front of driving face was effectively reduced,the safety production during driving was also guaranteed.The comprehensive utilization of the two measures has gained good pressure-relief effects on 21112 working face.更多还原