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以西部某矿7~#、8~#煤层为背景,采用理论分析、数值模拟和现场实践对浅埋深近距离煤层复合采空区自然发火防治问题进行研究,研究结果表明:近距离复合采空区自燃“三带”在水平方向上,距工作面大于150 m的部分,沿空留巷附近采空区内氧浓度升高,此区域遗煤氧化时间长,自然发火危险较高;在竖直方向上,氧气浓度较低,“三带”范围较小。
Taking the 7 ~ #, 8 ~ # coal seam of a certain mine in the west as the background, the theoretical analysis, numerical simulation and on-site practice were used to study the prevention and control of spontaneous combustion in the composite goaf of shallow depth and close distance coal seam. The results show that the short- Spontaneous combustion of “empty zone” and “three zones” In the horizontal direction, the oxygen concentration in the goaf near gob-side entry retaining lane is increased in the part of more than 150 m away from the working face. In this area, the oxidation time of coal remains long and the risk of spontaneous combustion is high ; In the vertical direction, the oxygen concentration is lower, “three bands ” smaller range.