高瓦斯煤层覆岩活动规律研究

    Study on Laws of Overburden Activity in High Gas Coal Seam

    • 摘要: 为了提高高瓦斯煤层采空区覆岩卸压瓦斯抽采效果,以微震监测的技术手段,对采动过程中采空区覆岩微震事件进行监测并记录,据此对采空区覆岩的破裂特征进行分析得到采动裂隙带的空间位置,进而判定采动覆岩高位瓦斯富集区。监测结果表明:工作面在回采期间周期来压步距约20 m,采动裂隙带高度约45 m,以此确定了高抽巷的垂距在38 m时最为合理,并利用理论计算的方法对此进行了验证。

       

      Abstract: To improve the effect of pressure relief gas drainage in overburden strata in goaf of gassy coal seam, the micro-seismic events of overlying strata in goaf during the mining process are monitored and recorded by micro-seismic monitoring technique. The fracture characteristics of the rock are analyzed to obtain the spatial location of the mining fractured zone, and then to determine the high gas concentration area of the overlying strata. The monitoring results show that the working face pressure step distance is about 20 m and the height of the mining fracture zone is about 45 m during the recovery period, so it is most reasonable to determine the vertical distance of the high-pumping roadway to be 38 m, and the theoretical calculation method is adopted to verify this.

       

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