中文摘要：

以提高瓦斯抽采效果为目标,某矿Ⅲ4423工作面为研究对象,采用理论分析、数值模拟、现场试验等研究方法,研究了顶板高位钻孔条件下瓦斯抽采的主要技术参数,数值模拟出高位钻孔抽采瓦斯前采空区的瓦斯分布情况与运移规律,以及负压分别为8、10 kPa时的高位钻孔瓦斯抽采效果.依据瓦斯流动＂O＂型圈理论与FLUENT数值模拟分析,优化设计高位钻孔抽采瓦斯工艺参数并进行现场试验.结果表明：当高位钻孔抽采负压为8 kPa、终孔位置调整到采空区裂隙带回风巷侧15~35 m范围内时,高位钻孔抽采瓦斯效果最佳,采空区内瓦斯最高浓度明显降低,单个钻场最大抽采瓦斯量为19821.74 m3,钻孔瓦斯浓度稳定在20%~30%之间,最大值达到50%,实现了工作面有效治理瓦斯和安全生产的目标.

英文摘要：

To improve the effect of gas drainage , taking the Ⅲ4423 working face in a mine as the research object , the main technical parameters of gas drainage under the condition of high level borehole in roof were studied using the theoretical anal -ysis , numerical simulation and field test methods .The gas distribution situation and migration laws in the goaf before the high level borehole gas drainage were simulated , as well as the gas drainage effect through high level borehole under the negative pressure of 8 kPa and 10 kPa respectively .According to the O-shape circle theory of gas flow and FLUENT numerical simula-tion, the technological parameters of gas drainage through high level borehole were optimized and designed , and the field test was carried out .The results showed that the gas drainage effect through high level borehole was the best when the negative pressure was 8 kPa and the position of final hole was adjusted into the 15-35 m range on the side of return airway for the fracture zone of goaf .The max-imum concentration of gas in the goaf decreased significantly , the maximum amount of gas drainage in single drill field was 19821 .74 m3 , and the gas concentration of borehole kept stable at 20%-30%, with the maximum value of 50%, so the targets of effective gas control and work safety in working face were realized .