基于应力分带特征的顺层钻孔合理封孔深度研究

发布时间：2018-03-20 08:17

本文选题：应力分带特征　切入点：顺层钻孔　出处：《矿业安全与环保》2017年01期 　论文类型：期刊论文

【摘要】：煤层瓦斯抽采钻孔合理封孔深度的确定是保证钻孔严密封孔、提高瓦斯抽采效果的关键技术。为确定白龙山煤矿一井C2煤层顺层钻孔的合理封孔深度,以煤巷掘进工作面钻屑瓦斯解吸指标K1值和钻屑量S值为基础数据,开展基于应力分带特征的顺层钻孔合理封孔深度研究并进行现场试验,结果表明:C2煤层煤巷掘进工作面巷帮0~3 m为卸压带,3~7 m为集中应力带,7 m以深为原始应力带;C2煤层煤巷掘进工作面顺层钻孔合理封孔深度应在7 m以上;试验钻孔瓦斯抽采浓度为9%~45%,平均为27%,瓦斯抽采浓度提高1.8~5.6倍;钻孔抽采负压为14~16 k Pa,抽采负压提高1.7~2.0倍,效果明显。
[Abstract]:The determination of reasonable sealing depth of coal seam gas drainage borehole is the key technology to ensure the tight sealing hole and to improve the gas drainage effect. In order to determine the reasonable sealing depth of C2 coal seam in Bailongshan coal mine. Based on the data of gas desorption index K1 and cuttings quantity S of coal roadway driving face, the reasonable sealing depth of bedding boreholes based on stress zonation characteristics is studied and field tests are carried out. The results show that the reasonable hole sealing depth should be more than 7 m in the coal roadway driving face of C _ 2 coal seam with 0 ~ 3 m as pressure relief zone and 3 ~ 7 m as concentrated stress zone and 7 m in depth as original stress zone in coal roadway driving face of Wei C2 coal seam. The concentration of gas extraction in the test borehole is 945, the average is 27, the concentration of gas extraction is 1.85.6 times higher, the negative pressure of borehole drainage is 1416kPa, the negative pressure of drainage is 1.720 times, the effect is obvious.
【作者单位】：中煤科工集团重庆研究院有限公司;国家煤矿安全技术工程研究中心;
【分类号】：TD712.6

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