为了提高抽采瓦斯钻孔的抽采效果,根据发耳矿井的现场测试,通过观察距穿层抽采钻孔不同距离的压力观测钻孔的瓦斯压力,利用瓦斯压力指标、瓦斯抽采率指标和灰色关联分析法相结合的方法进行分析,最终确定了7#煤层的瓦斯抽采有效半径,为突出工作面采掘工作前的预抽提供一定理论依据。 In order to improve the drainage effect of gas drainage borehole, the gas pressure of borehole is observed by observing the pressure at different distances from borehole through borehole mining according to the field test of the haul mine. The gas pressure index, gas drainage rate index And gray relational analysis method, the effective radius of gas drainage in No.7 coal seam is finally determined, which provides a theoretical basis for promulgation of pre-pumping before excavation of working face.