工作面沿空侧采空区煤自燃危险区域研究
Study on hazard zone of coal spontaneous combustion in adjacent goaf along working face
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摘要: 为研究沿空掘巷工作面在不同开采时期沿空侧采空区煤自燃危险区域，以营盘壕煤矿2202工作面和沿空侧2201采空区为例，采用煤自然发火实验分析2201采空区遗煤自燃极限参数，提出沿空侧采空区煤自燃危险区域判别条件，通过保护煤柱施工钻孔监测沿空侧2201采空区内气体体积分数和温度，利用Fluent数值模拟研究沿空侧2201采空区氧气体积分数分布规律，划分出沿空侧采空区煤自燃危险区域。结果表明：2202工作面回采期间，保护煤柱应力集中导致煤体破碎，沿空侧采空区氧气体积分数在10.1%~13.8%范围；工作面停采前沿空侧采空区氧气体积分数在10.3%~15%之间，回采期间，沿空侧采空区煤自燃危险区域为2202工作面前部45 m至后部119 m宽55 m靠近煤柱侧的狭长区域；停采前，沿空侧采空区煤自燃危险区域为2202工作面前部63 m至后部107 m宽42 m靠近煤柱侧的狭长区域。Abstract: To explore the hazard zone of coal spontaneous combustion in the adiacent goaf at different stages of the roadway driving face, the 2202 working face and the 2201 adjacent goaf of Yingpanhao Coal Mine were taken as examples. The large-scale experiment was conducted to analyze the coal spontaneous combustion limit parameters of the 2201 goaf. The conditions for identifying the hazard zone of coal spontaneous combustion in the adjacent goaf were proposed. Monitoring the gas concentration and temperature in 2201 adjcent goaf by the drilling holes through coal pillar, and the numerical simulation was conducted to study the oxygen concentration distribution in 2201 adjcent goaf, and the hazard zone of coal spontaneous combustion in the adjacent goaf was obtained. The results show that during the mining period of the 2202 working face, the coal pillar was broken by the stress concentration, and the oxygen volume fraction of the adjacent goaf was in the range of 10.1% to 13.8%. The oxygen volume fraction of the adjacent goaf before the stop mining period was between 10.3% and 15%. During the mining period, a narrow area on the coal pillar side with width 55 m from the front 45 m and behind 119 m of 2202 working face in the adjacent goaf was the coal spontaneous combustion hazard zone. Before the stop mining period, a narrow area on the coal pillar side with width 42 m from the front 63 m and behind 107 m of 2202 working face in the adjcent goaf was in an oxidizing environment.
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