针对高瓦斯低透气性特厚煤层回采期问瓦斯涌出量大,抽放率不高的问题,通过经济和技术比较,确定采用地面立孔抽放技术,研究了地面立孔抽采技术在特厚煤层8204工作面中的应用情况,结果表明:8204工作面抽出瓦斯浓度最高可达28.69%,平均浓度3.5%左右,能够有效地降低采空区中的瓦斯含量;瓦斯抽放率在15~35 m~3/min之间波动,总体上保持稳定。 In view of the problem of large gas emission and low drainage rate during the recovery period of the high gas and low permeability gas-bearing thick coal seam, the technology of ground vertical hole drainage is determined by economic and technical comparison, The results show that the gas concentration of 8204 working face can reach 28.69% with the average concentration of about 3.5%, which can effectively reduce the gas content in the goaf; the gas drainage rate is 15% ~ 35 m ~ 3 / min fluctuations between the overall stability.