摘要
针对煤层钻孔抽放瓦斯后煤层孔隙裂隙发育致使瓦斯浓度下降，钻孔有效抽放期缩短的技术难题，首次提出二次封孔方法．阐述了二次封孔方法的基本原理，建立了微细膨胀粉料颗粒在孔隙裂隙中运动的数学模型，并在晋城煤业集团公司寺河矿开展了6个月的现场工业性试验．结果表明：应用二次封孔方法可提高瓦斯抽放浓度25％～50％，延长钻孔的有效瓦斯抽放期3个月．
Gas concentrations drop, and the effective gas drainage period of holes is shortened, because pores and cracks in the coal seam become completely developed after gas drainage. The＇second hole sealing method is proposed as a solution to this problem. The principles are described and a mathematical model is formulated to describe the movement of fine expansion particles within the pores and cracks of the coal seam. An industrial scale test of this method was carried out over a period of six months at the Sihe mine of the Jincheng Mine Industry Group. The gas drainage concentration was improved by 25 to 50% after application of the method and the period of effective gas drainage was extended for three months.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2009年第6期764-768,共5页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(50604014)
教育部新世纪优秀人才资助项目(NCET-08-0838)
国家大学生创新性实验计划项目(081029024)
关键词
矿井瓦斯
抽放
封孔
二次封孔方法
mine gas
gas drainage
hole sealing
second hole sealing method
