Spontaneous combustion of coal is one of the major hazards threatening production safety during longwall mining. Mining-induced voids, which provide passages for air leakage, are the key factor triggering spontaneous combustion of coal in longwall goafs. In this study, a comprehensive method, which combined pressure balance, grouting injection, and filling fissures, was proposed to prevent spontaneous combustion of coal in longwall goafs with complex air leakage. Field engineering practice was carried out in Sitai Coal Mine in China. The results demonstrated that with the application of the proposed method, in the working face, the concentration of CO was decreased from 31ppm to 0 and the air leakage quantity was decreased from 261 to below 80 m3min-1. The gas samples analysis from the gob areas also indicated that concentrations of O2 and CO were successively decreased, indicating that the risk of spontaneous combustion of coal in goafs was eliminated. The above mentioned analysis indicates that, the method proposed in this study is useful and efficient. Successful application of this technology could provide reference for the treatment of other coal mines.
展开▼
机译：煤的自燃是长壁开采期间威胁生产安全的主要危害之一。采矿引起的空隙为空气泄漏提供了通道，是触发长壁采空区煤自燃的关键因素。在这项研究中，提出了一种综合的方法，该方法将压力平衡，注浆注入和填充裂缝相结合，以防止长壁采空区中煤的自燃与复杂的空气泄漏。在中国的斯泰煤矿进行了现场工程实践。结果表明，该方法的应用使工作面中的CO浓度从31ppm降低至0，漏气量从261降低至80 m 3 min < sup> -1 。采空区的气体样本分析还表明，氧气和一氧化碳的浓度依次降低，这表明采空区煤自燃的风险得以消除。以上分析表明，本研究提出的方法是有效的。该技术的成功应用可为其他煤矿的治理提供参考。
展开▼
