School of Energy Science and Engineering.Henan Polytechnic University Cultivation Base,Provincial and MOE Joint Key Lab of Gas Geology and Gas Control,Henan Polytechnic University

为研究岩浆盖层下煤层瓦斯赋存规律和动力灾害的特征,采用理论分析和工程案例验证的方法,分析了岩浆盖层条件下煤层变质程度、孔隙结构、瓦斯吸附解吸性能和瓦斯赋存特征,揭示了岩浆盖层对下伏煤层瓦斯动力灾害的控制作用机制。研究结果表明:煤层变质程度、孔隙结构发育程度和瓦斯吸附解吸性能与岩浆盖层的厚度和空间距离关系密切,一般随着岩浆盖层厚度的增加而单调增加,随着与岩浆盖层距离的增加而单调递减。岩床以盖层的形式圈闭煤层瓦斯,使得煤层瓦斯压力和瓦斯含量增加,在采掘作用下容易导致煤与瓦斯突出灾害的发生,并形成地面喷孔等复杂瓦斯动力灾害事故。

Due to the outburst danger discrinination of the gassy sean would be a kesy to prevent the coal and gas outburst ccurred.therefore, with the analysi onthe excavation site seam stress and gas conditions at the excavation site ,the paper provided the defintin of the real cuturst danger of the seam and hed tht to supose the gas pressure released zone removed,under the stress and seam insitu gas pressure role,the stabiliy of the gassy seam represented the real outburst danger. Based on the coal strength as the grouping index,the RFPA2D-Ftow software and sinmilar sinulatin experiment metod was appied to study the real outburst canger cn.dtons of each groupcoal underthe stress and gaspressue role.The gasprssure- stresscritical condiions of the seam outbust could be divided into thee stages.At the fist stage,within the low level stess range. the stress would hinder the outburst occured. The ouburstocured at tis stage mainly oud be the gas pressue ole as the main and the stress increased wauld play areinforced role to the coal mass At the second stage,withthesrss increased.the stress role would be changedfrom the coal mass reinforced to the falre of the cal mass.The stress would intesify the outburst ocured.At the third stage withthestress continuously increased.he gas pressure to occur the outburst would be decreased.would be fixed at a certain level and would be not varied ith the stress increased. At ths moment.the mac.ofaires would be occured on the coal massunder the roleof the high stress The oal mass status would be at the stage after peak and the role of the gas pressure mainly would damage the cal with the resicual trength and thow the cal mass out.Finally.according to the equation of the critital rel tionship between the gas pressure and stress of the coal mass falre,the cal strength paramelers were applied to obtain the nethod to determine the real cutburst danger of the coal mass

江苏省高校优秀中青年教师和校长境外研修计划资助项目(苏教办师[2015]7号)；江苏高校“青蓝工程”资助项目(苏教师[2016]15号)；