关键词: 关键词：瓦斯抽放孔, 封孔工艺, 聚氨酯, 水泥浆

Abstract: Abstract: A study on stress change and fracture in gas drainage roadway were done, because of the poor effect of sealing for gas drainage hole by using polyurethane in Xinjing coal mine of Yangquan coal industry(group) co.,ltd. The hole sealing technology suitable for gas drainage hole in Xinjing coal mine be obtained, by improving the parameters and process of hole sealing. The new sealing technology for gas drainage hole is using polyurethane and cement slurry. The new hole sealing technology can effectively improve gas drainage effect, according to field application. Key words: gas drainage hole; hole sealing process; polyurethane; cement slurry

Key words: Key words: gas drainage hole, hole sealing process, polyurethane, cement slurry