宏岩煤矿顺煤层钻孔最佳封孔深度研究
Study on the Best Hole Sealing Depth for Boreholes Along Coal Seam in Hongyan Coal Mine
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摘要: 宏岩煤矿瓦斯涌出主要来自于本煤层瓦斯涌出,为提高本煤层瓦斯抽采效率,确定最佳封孔深度,通过分析测试煤层巷道“三带”范围与巷道预排瓦斯宽度带,结合现场4组钻孔对比测试,分别从本煤层孔、穿层孔、封孔深度、是否带压封孔4个方面进行对比。结果表明,影响本煤层瓦斯抽采浓度的主要因素是煤层巷道及钻孔“三带”中卸压带与集中应力带所产生的煤层微裂隙,采用带压封孔12 m是最理想的封孔深度。Abstract: The gas emission in Hongyan Coal Mine mainly comes from the gas emission in coal seam. In order to improve the gas extraction efficiency and determine the best hole sealing depth, through the analysis and test of “three zones” scope and pre-pumping gas width of roadway, combined with the comparative test of four groups of boreholes in field, we carry out comparison from coal seam hole, through beds hole, hole sealing depth, hole sealing with or without pressure four aspects. The results show that the main factor influencing the gas drainage concentration of the coal seam is the micro-cracks in the coal seam from pressure relief zone and the concentrated stress zone in the coal seam roadway and borehole “three zones”, and hole sealing with pressure of 12 m is the most ideal hole sealing depth.
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