本煤层瓦斯抽采钻孔封孔技术试验分析-experimental analysis of hole sealing technology for gas drainage boreholes in this coal seam.docx

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本煤层瓦斯抽采钻孔封孔技术试验分析-experimental analysis of hole sealing technology for gas drainage boreholes in this coal seam.docx

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本煤层瓦斯抽采钻孔封孔技术试验分析-experimental analysis of hole sealing technology for gas drainage boreholes in this coal seam

内蒙古科技大学硕士学位论文 Pocket-grout sealing method”. This method can effectively eliminate the cracks when drilling, and it gives effective support to gas drainage borehole, guarantee the stability of borehole. This paper analyzed different effects between Polyurethane sealing method and Pocket-grout sealing method, with the actual situation of No.8 Tian’an coal mine. Through the comparison, Pocket-grout sealing method has obvious effect, it applies to No.12 Tian’an coal mine. by using the FLAC3D numerical simulation software, reasonable Grouting pressure of sealing equipment has been established, it effectively eliminates or reduces the scope of the plastic zone. By using drills and drill cuttings method, established the reasonable hole depth (8~12m) of machine lane drilling of 31010, which provided a reference for the mine. Key word：Gas drainage drilling;Capsular bag grouting sealing method;Active support;Numerical simulation;Reasonable sealing depth. 目录 1 绪论 .............................................................................................................................. 1 1.1 问题的提出 ........................................................................................................ 1 1.2 我国与国外研究现状与发展 ............................................................................. 4 1.2.1 国外瓦斯抽采封孔技术现状 .................................................................. 4 1.2.2 国内瓦斯抽采封孔技术现状与评述 ...................................................... 5 1.2.3 国内其它封孔方法及评述 ...................................................................... 9 1.3 主要研究内容及意义 ...................................................................................... 13 1.4 创新及贡献 ...................................................................................................... 13 2 抽采钻孔浓度分析 ..................................................................................................... 15 2.1 钻孔内瓦斯涌出量 .................................