In order to improve the hole drilling and sealing efficiency and tightness of downhole gas extraction in Meiyukou Mine,a new high holding pressure secondary grouting hole sealing technology is proposed by analyzing the existing gas hole drilling and sealing process technology in Meiyukou Mine and combining with the actual geological conditions of the downhole in Meiyukou Mine,the high holding pressure secondary grouting hole sealing principle,grouting hole sealing scheme,and selection of grouting materials are studied.The use of high expansion grouting material for primary grouting hole sealing in the shallow surrounding rock of the borehole,and the use of secondary grouting material for secondary grouting hole sealing in the small gaps around the borehole,can significantly improve the efficiency and safety of downhole gas hole drilling and sealing.Taking the 2204 fully mechanized mining face of Meiyukou Mine as the research object,the high holding pressure secondary grouting hole sealing technology is verified in practice.The results show that the main function of secondary grouting material is to seal the cracks around the grouting hole,with high requirements for fluidity and strength after condensation.This grouting hole sealing process can increase the hole sealing efficiency by 7.6%and increase the gas extraction volume fraction by 6.66%,effectively improving the efficiency and safety of downhole gas extraction in Meiyukou Mine.
关键词
瓦斯抽采/钻孔封孔/注浆材料/二次注浆封孔
Key words
gas extraction/hole drilling and sealing/grouting material/secondary grouting hole sealing
维普
万方数据