基于应力分带特征的顺层钻孔合理封孔深度研究  

Research on Reasonable Sealing Depth of Boreholes along Seam Based on Stress Zoning Characteristics

作　　者：吴教锟 

机构地区：[1]中煤科工集团重庆研究院有限公司,重庆400037 [2]国家煤矿安全技术工程研究中心,重庆400037

出　　处：《矿业安全与环保》2017年第1期62-65,共4页Mining Safety & Environmental Protection

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。The determination of the reasonable sealing depth of gas drainage boreholes in coal seam is a key technology for ensuring the tight sealing of boreholes and improving the gas drainage effect. In order to determine the reasonable sealing depth of the holes drilled along C2 seam in Bailongshan Coal Mine, study and field test were carried out on the reasonable sealing depth of the boreholes along the seam based on the stress zoning characteristics by taking the drilling cuttings gas desorption index K1 and the drilling cuttings weight S in the coal roadway heading face as the basic data. The results showed that 0 to 3 m range of the coal roadway sides in C2 seam was the pressure relief zone, 3 to 7 m range was the stress concentrated zone and the range beyoud 7 m was the original stress zone; the reasonable sealing depth of the holes drilled along C2 seam should be 7 m or more; the gas drainage concentration of the test hole was 9% to 45%, an average of 27%, the gas drainage concentration increased by 1.8 to 5.6 times; the negative pressure of the borehole gas drainage was 14 to 16 kPa, increased by 1.7 to 2.0 times, so the effect was obvious.

关 键 词：应力分带特征 顺层钻孔 钻屑瓦斯解吸指标 钻屑量 合理封孔深度 

分 类 号：TD712.6[矿业工程—矿井通风与安全]