冲击危险工作面大直径卸压钻孔深度优化

Optimization of Large Diameter Pressure Relief Borehole Depth in Impact Dangerous Working Face

采用FLAC2D数值模拟软件,以跃进煤矿25110工作面地质条件为基础,建立了大直径钻孔卸压深度的优化模型,结合能量传播衰减理论,得到了钻孔卸压后的冲击危险指数表达式,并在一定的参数条件下分析并比较了不同深度大直径卸压钻孔的卸压效果.研究表明:25110工作面大直径卸压孔深度为45m时,冲击危险指数最小,卸压效果最明显.

Based on the geological conditions of Yuejin Coal Mine 25110 working face,the optimization model of pressure relief depth of large diameter boreholes is established by using FLAC 2D numerical simulation software.Combining with the theory of energy propagation attenuation,the expression of impact risk index after pressure relief of boreholes is obtained.The pressure relief effect of large diameter pressure relief boreholes with different depths is analyzed and compared under certain parameters.The simulation results show that when the depth of large diameter pressure relief hole in 110 working face is 45 m,the impact risk index is the smallest and the pressure relief effect is the most obvious.