关键词: 瓦斯预抽, 底抽巷, 穿层钻孔, 抽采工艺

Abstract: Aiming at the problems of poor gas pre-drainage effect and difficult drainage standard in M9 coal seam roadway of Linhua Coal Mine，the improvement measures are put forward from the aspects of drilling design，construction，hole sealing and drainage. It includes optimizing the drilling design parameters to reduce the drilling movement，using the ' guide drill pipe + control pressure drilling rig ' to reduce the amount of falling，using air slag discharge in the coal section to reduce the gas dynamic phenomenon， using the bag and FDLFZ fast sealing device to optimize the sealing，using the secondary hydraulic reaming to extend the peak period of drilling flow，and optimize the buried pipe process and reasonable control of the extraction pipe network. After technical optimization，it was implemented in the cross-seam borehole of 1091 transportation bottom pumping roadway in Linhua Coal Mine. After 12 months of pre-pumping，the extraction rate reached 66.1%. After the extraction reaches the standard，there is no gas dynamic phenomenon，and the average daily progress of coal roadway excavation is more than 7 m.

Key words: gas pre-drainage, bottom drainage roadway, cross-seam borehole, extraction technology