静态膨胀开裂突出煤层后的瓦斯抽放效果研究  

Study on gas drainage effect in outburst coal seam after static expansion and cracking

作　　者：谢雄刚[1] 张波 邓爱萍 许石青[1] XIE Xionggang;ZHANG Bo;DENG Aiping;XU Shiqing(Mining College,Guizhou University,Guiyang Guizhou 550025,China;Academic,Guizhou University,Guiyang Guizhou 550025,China)

机构地区：[1]贵州大学矿业学院,贵州贵阳550025 [2]贵州大学教务处,贵州贵阳550025

出　　处：《中国安全科学学报》2018年第10期111-117,共7页China Safety Science Journal

基　　金：国家自然科学基金资助(51864009);贵州省科技厅社发攻关项目[黔科合SY字(2015)3001];贵州省科技厅项目(黔科合支撑[2017]2821)

摘　　要：为了提高突出煤层瓦斯渗透率,解决我国低透气性突出煤层瓦斯抽放难题,理论研究静态膨胀剂-附加应力-瓦斯渗透率三者之间的相互关系;对比实测某矿1235运输巷右帮M3突出煤层膨胀开裂区和常规抽放区单孔瓦斯抽放参数。理论推导得出:突出煤层钻孔注入静态膨胀剂后有效应力减小和煤体瓦斯渗透率增加。对比表明:1235运输巷右帮膨胀开裂区单孔瓦斯抽放参数明显优于常规抽放区对应的瓦斯抽放孔;测试条件下,相同孔间距与钻孔直径比值不同钻孔直径测试方案中,膨胀开裂区随着钻孔直径增大,单孔瓦斯抽放参数值呈明显上升趋势,其中,膨胀开裂区1号Φ94 mm抽放孔瓦斯抽放流量均值高达0. 104 m3/min和瓦斯抽放体积分数均值高达63%,该孔膨胀开裂瓦斯抽放效果最佳;较常规抽放区同直径的6号Φ94 mm钻孔的瓦斯抽放流量均值和瓦斯抽放体积分数均值分别提高了39%和15%。In order to improve the gas permeability of outburst coal seam and solve the problem of gas drainage in low permeability outburst coal seam in China,the relationships between static expansive agent,additional stress and gas permeability were studied theoretically,and the effective stress reduction and gas permeability increase after injecting static expansive agent into the borehole of outburst coal seam were deduced. A comparison of the gas drainage effect parameter of the single hole was made between the zone of expansion and crack and the zone of regular drainage in the M3 outburst coal seam in the right of 1235 working face.The result shows that the gas drainage result is obviously improved by the static expansion and crack in the M3 outburst coal seam,the single hole drainage parameters of the expansion and crack zone is obviously better than the parameters of the drainage hole of the regular drainage zone in the right of 1235 working face,that under this test condition,in the different drilling diameter test scheme which with the same μ,the expansion crack zone increases with the drilling diameter,the single hole gas drainage parameters show an obvious rising trend,mean value of gas drainage flow is 0. 104 m3/min and the meanvalue of gas drainage volume fraction is 63% in the Φ94 mm No. 1 drainage hole in the expansion and crack zone,the expansion and crack effect of the drainage hole is the best,compared with the Φ94 mm No.6 drainage hole in the regular drainage zone,the mean values of gas drainage flow and volume fraction is improved by 39% and 15%.

关 键 词：突出煤层 静态膨胀开裂 附加应力 瓦斯抽放参数 瓦斯抽放效果 

分 类 号：X936[环境科学与工程—安全科学]