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深井冲击倾向采场的沿空巷道是冲击地压易发难防治区域。针对华丰煤矿埋深千米强冲击缺少了上保护层的开采条件,研究其沿空巷道防冲机制,将下工作面回风巷置于已采上区段运输巷底板下方卸压区域,实现了埋深超千米无区段煤柱开采;通过建立端头覆岩结构模型计算胶结顶板巷道支护强度,采用广义库仑理论计算采空侧压力评估两帮支护匹配性,确定的支护设计确保覆岩、两帮稳定;通过支架承载变形特征阐述其对冲击载荷的有效防冲机制。采用微震、地音、应力在线预警系统和钻屑法监测,实现区域预警→点监测量化验证预警,评价沿空巷道无冲击危险,不需要采取以往繁琐且难以保证解危效果的爆破、大直径钻孔卸压等工艺,且支护效果良好。研究成果对深井防治沿空巷道冲击地压有借鉴价值。
Deep well prone to impact mining stope along the roadway is easy to prevent the impact of rock burst control area. For Huafeng coal mine, the impact of kilometer depth lacks the mining conditions of the upper protective layer, studies its anti-knocking mechanism of gob-side entry roadway, places the return airway of the lower face on the relief area below the floor of the transportation lane that has been mined, The section pillar overburden structure model was used to calculate the support strength of the cemented roof roadway. The generalized Coulomb theory was used to calculate the sidetrack pressure to evaluate the matching of the two supports, and the definite branch The design ensures the overburden and the two stabilities are stable. The effective anti-shock mechanism of impact load is described by the characteristics of bearing deformation. Using microseismic, geo-acoustic and stress on-line early warning system and drill cuttings monitoring to realize regional early warning → point monitoring and quantification verification and warning, evaluating the danger of impact along gob roadway without the need of adopting the previous complicated and difficult to ensure the effect of defrosting blasting, large diameter Drilling pressure relief and other technology, and the supporting effect is good. The research results have reference value to the deep well prevention and control of rock burst along the roadway.