中国安全科学学报 ›› 2019, Vol. 29 ›› Issue (1): 37-42.doi: 10.16265/j.cnki.issn1003-3033.2019.01.007

• 安全工程技术科学 • 上一篇    下一篇

深部煤层抽采钻孔自然发火原因分析与防治

齐庆杰1,2 教授, 赵尤信1,2, 贾新雷1,2, 周新华 副教授1,2   

  1. 1 辽宁工程技术大学 安全科学与工程学院,辽宁 阜新 123000;
    2 矿山热动力灾害与防治教育部重点实验室,辽宁 阜新123000
  • 收稿日期:2018-10-20 修回日期:2018-12-05 出版日期:2019-01-28 发布日期:2020-11-23
  • 作者简介:齐庆杰 (1964—),男,辽宁朝阳人,博士,教授,博士生导师, 主要从事矿井灾害防治、大气污染防治和洁净煤燃烧技术等方面的研究。E-mail:qi_qingjie@ 163. com。
  • 基金资助:
    国家自然科学基金资助 (51704147);辽宁省教育厅科学研究一般项目(LJYL005)。

Cause analysis and prevention of spontaneous combustion in deep coal seam drilling

QI Qingjie, ZHAO Youxin, JIA Xinlei, ZHOU Xinhua   

  1. 1 College of Safety Science and Engineering, Liaoning Technical University, Fuxin Liaoning 123000, China;
    2 Key Laboratory of Mine Thermodynamic Disasters & Control of Ministry of Education, Fuxin Liaoning 123000,China
  • Received:2018-10-20 Revised:2018-12-05 Online:2019-01-28 Published:2020-11-23

摘要: 为避免深部煤层抽采钻孔自然发火,以平煤十矿24100工作面抽采钻孔为研究对象,运用理论计算和数值模拟的方法研究抽采钻孔自然发火的原因。首先通过理论分析确定抽采钻孔封堵段周围破碎区与塑性区半径;通过数值模拟的方法,以煤自然发火最小风速为依据优化24100工作面瓦斯抽采钻孔封孔深度和抽采负压,并与24100工作面现场工程试验结果进行相互验证。结果表明:钻孔封堵段周围塑性区半径0.22 m为抽采钻孔提供了漏气通道,24100工作面抽采钻孔最佳封孔深度为17 m、抽采负压为25 kPa,可以防止抽采钻孔自燃。

关键词: 抽采钻孔自然发火, 最低发火风速, 应力分布, 数值模拟, 封孔深度, 抽采负压

Abstract: To avoid spontaneous combustion of extraction boreholes in deep coal seam, the drilling of 24100 working face of Pingmei No. 10 coal mine was taken as the research object, the causes of spontaneous combustion of extraction boreholes were studied by means of theoretical calculation and numerical simulation. The radii of both fracture zone and plastic zone around the plugging section of the extraction borehole were determined by means of theoretical analysis. Based on the numerical simulation method, the sealing depth and suction negative pressure of the gas drainage hole of 24100 working face were optimized according to the minimum wind speed of spontaneous combustion of coal. The results were verified with the engineering experiment in 24100 working face. The results show that the radius of plastic zone around the plugging section of borehole is 0.22 m, which provides a leak passage for the extraction borehole, and that the optimum sealing depth of the extraction borehole in 24100 working face is 17 m and the negative pressure of the extraction is 25 kPa, which can prevent the spontaneous combustion of the extraction borehole.

Key words: spontaneous combustion of extraction boreholes, minimum ignition wind velocity, stress distribution, numerical simulation, sealing depth, vacuum

中图分类号: