瓦斯预抽钻孔合理封孔深度的确定  

Determination of Reasonable Sealing Depth of Gas Predrainage Holes

作　　者：李国荣 LI Guorong

机构地区：[1]山西煤炭进出口集团蒲县豹子沟煤业有限公司

出　　处：《山西焦煤科技》2019年第7期34-36,44,共4页Shanxi Coking Coal Science & Technology

摘　　要：山西霍尔辛赫煤矿井下工作面瓦斯预抽钻孔的封孔深度由于采用经验法确定,封孔质量较差,抽采浓度低。采用数值模拟与钻屑指标法现场测试相结合的方法研究巷道裂隙带发育范围,确定钻孔的封孔深度应不小于12m.工业试验结果表明,钻孔封孔深度为12m时,保证了钻孔抽采浓度。The sealing depth of gas predrainage holes in the underground working face of the Holsinghe coal mine in Shanxi was determined by the empirical method, which caused the poor quality in sealing, together with the low drained gas concentration. The method of numerical simulation combined with the on-site test of drill cuttings index method is introduced to investigate the development scope of the fracture zone above the roadway, and it is determine that the sealing depth of the borehole should be no less than 12 m. Industrial test results show that when the sealing depth of borehole reaches 12 m, it performs the best for drained gas concentration.

关 键 词：裂隙带 松动圈 钻屑指标法 封孔深度 抽采浓度 

分 类 号：TD712.62[矿业工程—矿井通风与安全]