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以西北矿区三道沟煤矿为背景,采用理论分析和数值模拟对浅埋深大范围采空区注氮技术进行研究,结果表明:未采取注氮措施时,“氧化带”分布明显比采取注氮措施时的范围大;增加注氮流量后,采空区各层位“氧化带”范围明显减小,当采空区存在大量漏风通道时,增大注氮量可有效代替采空区漏风,起到惰化采空区的效果;对比采空区不同层位的高浓度氮气聚集区,层位越高,高浓度氮气聚集区越小,被惰化的面积越小。
Taking the Sandaogou coal mine in the northwest of China as the background, the nitrogen injection technique in goaf with shallow depth and large area was studied by theoretical analysis and numerical simulation. The results showed that the distribution of “oxidation zone” was significantly higher than that without nitrogen injection When the nitrogen injection rate is increased, the range of “oxidation zone” in each layer of mined-out area decreases obviously. When there is a large number of air leakage channels in the gob area, increasing the amount of nitrogen injection can effectively replace In the gob area, air leakage can play the role of inerting the goaf. Compared with the high-concentration nitrogen accumulation zones in different layers of the goaf, the higher the horizon, the smaller the concentration of high-concentration nitrogen and the smaller the inerted area.