高瓦斯煤层群首采层“Y”型通风瓦斯抽采技术  

Gas Extraction Technology for “Y” Ventilation in the First Layer of High Gas Coal Seam

作　　者：李朝[1] 翟艳鹏[1] 

机构地区：[1]淮南矿业(集团)有限责任公司安全开采总院,安徽淮南232001

出　　处：《煤矿安全》2017年第9期77-80,共4页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(51304006)

摘　　要：针对我国中东部煤田煤层群埋藏深、煤质软、瓦斯压力和瓦斯含量高、瓦斯难以抽采的难题,利用数值模拟和现场工程试验相结合的方法,系统的研究了高瓦斯煤层群首采层"Y"型通风瓦斯抽采技术。研究获得了煤层开采上覆围岩裂隙演化特性规律以及垂向位移与下沉规律,探明了在10倍采高层位处的上覆岩层离层裂隙及纵向裂隙最发育,此处形成了瓦斯富集区,并同时形成了相互沟通的裂隙网为瓦斯抽采提供了运移通道。设计了大直径钻孔组瓦斯抽采方法,综合利用大直径钻孔组和采空区埋管技术,使得顶板裂隙带内的卸压瓦斯以及采空区内的瓦斯得以高效抽采,回风流中的瓦斯浓度控制在0.3%以下,实现了利用大直径钻孔组代替倾向高抽巷高效抽采瓦斯的目的。Numerical simulation and on-site test were combined to research the coal mining technology of Y-type ventilation with thick and soft coal seam systematically for the problems of deep buried coal seam group, soft coal quality, high gas pressure and gas content in the coal seam of the eastern part of China. Evolution characteristics of surrounding rock cracks in thick coal seam mining and the vertical displacement and subsidence were obtained in this paper. The research result showed that the bed- separated fissures and lengthways fissures of overburden rock stratum in the location of 10 times mining level were most developed. Gas enrichment zone and crack network which can provide a passage for gas drainage were formed here. The method of gas drainage in large diameter drilling group was designed, and the pressure-released gas in roof fractured zone and the gas in gob were effectively controlled by large diameter borehole and pipe-buried technology. Finally, the gas concentration in the air was controlled below 0.3%, and efficient gas drainage was realized by the method that high dip high drainage roadway gas was replaced by large diameter borehole.

关 键 词：煤层群 “Y”型通风 钻孔组 大直径钻孔 瓦斯抽采 

分 类 号：TD713[矿业工程—矿井通风与安全]