突出矿井中二次动压巷道煤柱留设合理宽度及支护技术研究

Study on reasonable width and support technology of coal pillar in secondary dynamic pressure roadway in outburst mine

通过数值计算和现场观测相结合技术,研究采空区内矿山压力二次动压的再平衡力作用范围和煤体压裂对煤层中瓦斯的扰动释放,从而选择沿空掘巷煤柱的合理宽度,从而将沿空掘进巷道布置在相邻采空区残余支承压力和采煤工作面支承压力峰值范围之外,同时加强巷道支护强度,不仅能减少瓦斯对掘进的制约,大大加快顺槽巷道的掘进速度,减少瓦斯对矿井安全生产的影响,最大程度确保矿井采掘平衡,同时也能进一步提高煤炭回收率,减少资源浪费。

Through the combination of numerical calculation and field observation,the action range of rebalancing force of secondary dynamic pressure of mine pressure in goaf and disturbance release of coal body fracturing on gas in coal seam are studied,so as to select reasonable width of coal pillar in gob driving roadway and arrange gob driving roadway outside the range of residual abutment pressure in adjacent goaf and abutment pressure peak value of mining face.At the same time,strengthening the support intensity of roadway can not only reduce the restriction of gas on tunneling,greatly accelerate the driving speed of gateway roadway,reduce the impact of gas on mine safety production,and ensure the balance of mining and excavation to the greatest extent,but also further improve the coal recovery rate and reduce resource waste.