定向拦截钻孔施工技术研究及应用  

Directional Interception Drilling Construction Technology and Application

作　　者：李振福 LI Zhenfu(Sihe Mine,Jincheng Coal Group,Jincheng 048205,China)

机构地区：[1]山西省晋煤集团寺河矿,山西晋城048205

出　　处：《山西煤炭》2019年第1期81-86,共6页Shanxi Coal

摘　　要：定向钻孔孔内失稳严重影响着其抽放效率,会导致覆盖区域内瓦斯抽放不彻底、煤体残余瓦斯含量较高的问题出现,在巷道掘进过程中,煤体冒落导致大量瓦斯瞬间释放,会造成回风流瓦斯浓度升高,存在重大安全隐患。针对这一问题提出了定向拦截钻孔施工方案,即避开失稳区域重新施工定向钻孔对原有钻孔形成有效拦截,为瓦斯产出创造新的通道。在寺河矿东井区5310工作面设计了3种不同方案进行了试验,同时基于覆盖煤体瓦斯抽放效率、巷道风排瓦斯量等指标对施工方案进行了优选。结果表明,分支居于不同层位的定向拦截钻孔覆盖区域煤体瓦斯抽放效率增幅最大,达到12.29%;同时巷道掘进过程中风排瓦斯量降幅最大,达到20.6%,证实了这一方案为最优方案。The instability in directional drilling seriously affects the drainage efficiency,resulting in incomplete gas drainage and high residual gas content in the coverage area.In the tunneling process,there is a major safety hazard of instantaneous release of a large amount of gas and increasing gas concentration in the return airflow caused by coal body collapse.A directional interception drilling construction scheme was proposed,which could avoid the unstable area and reconstruct.The effective drilling is formed by the directional drilling to create a new channel for the gas.In the 5310 working face of eastern area of Sihe Mine,three different schemes were tested and were optimized based on some indicators,including gas drainage efficiency and the gas ventilation volume.The results show that,the gas drainage efficiency increases most to 12.29% in the coal body covered with boreholes with the directional interception at different levels;meanwhile,during the excavation process,the gas ventilation volume decreases most to 20.6%,which confirms the scheme optimal.

关 键 词：钻孔失稳 定向拦截钻孔 抽放效率 风排瓦斯量 

分 类 号：TD82[矿业工程—煤矿开采]