叙永煤矿薄煤层开采极近距离邻近层泄压瓦斯治理技术研究

Research on Control Technology of Gas Drained from Close Distance Adjacent Seams During Thin Seam Mining of Xuyong Coal Mine

瓦斯灾害是煤矿安全生产过程中极其难以控制的重大危险源,特别针对南方矿井具有煤层薄、煤层群间距小、地质构造复杂、瓦斯赋存量大等特点,造成瓦斯治理难度大。如何在极复杂地质条件下的薄煤层开采时,有效治理极近距离煤层群泄压瓦斯,通过采用在煤层群中布置高位抽采巷及配套长钻孔抽采回采过程中邻近煤层群泄压区采空区瓦斯。研究表明,合理布置高位抽采巷布置间距、钻孔长度、终孔间距和终孔层位、抽采负压等相关参数,使工作面瓦斯抽采纯量提高了10 m 3/min以上,工作面抽采率提高到60%以上,风排瓦斯量明显减少,实现了特殊赋存条件下煤层安全回采作业,达到了安全生产的目的。

Gas disaster is a major dangerous source which is extremely difficult to control in the process of coal mine safety production.Especially for the mines in the South,they are featured by thin coal seams,small coal seam spacing,complex geological structures and large gas reserves and so on,which all makes the gas control work difficult.How to effectively control gas emitted from short distance seams when mining is carried out in thin coal seams under extremely complicated geological conditions.It is proposed to position high location drainage lane and supporting long drilling hole in the coal seams group,to drain gas in pressure relief area and gob area of adjacent coal seams in coalface during the coal mining process,so as to reduce the emission amount of the pressure relief gas in the adjacent seams.According to the research,the proper layout of parameters such as lanes spacing,drilling length,drilling spacing and drilling position of high location extraction lane makes the net volume of gas extraction in coalface increased by more than 10 m 3/min,the extraction rate is increased to more than 60%,and the volume of windblown mine gas was reduced.The safe mining in coal seams under special storage condition is realized,and the purpose of safety production is achieved.