Abstract Coal seam mining, especially during roadway driving with narrow coal pillars, can cause air leakage along the gob side and increase the risk of spontaneous coal combustion. To explore the oxygen distribution and spontaneous coal combustion risk zone in an adjacent gob of a fully mechanized mining face, a temperature-programmed experiment, a secondary oxidation experiment, gas monitoring, and numerical simulation were conducted. The oxygen consumption rates of the coal sample in primary and secondary oxidation processes were compared, and the oxygen concentration at the inner coal pillar of an adjacent gob was monitored. The oxygen concentration distribution in the adjacent gob was simulated, and the spontaneous coal combustion risk zone in the adjacent gob was determined. The results show that secondary coal oxidation was stronger than primary oxidation below 90 °C, and primary coal oxidation was stronger than secondary oxidation above 90 °C. The oxygen consumption rate ratio (i.e., the oxidation size) of the coal sample during primary and secondary oxidation processes below 90 °C was fitted to obtain the relationship. During roadway driving of the 2202 working face along the gob, the air leakage intensity of the coal pillar was between 0.0335–0.0365 cm3/(s∙cm2). The area 23 m from the coal pillar to the depth of the adjacent gob behind the heading face was found to be at risk of spontaneous coal combustion. During normal and end mining of the 2202 working face, the air leakage intensity of the coal pillar along the gob was between 0.005–0.024 cm3/(s∙cm2). The residual coal in a narrow area, 87 m long in the adjacent gob was in an oxidizing environment. When the working face advanced slowly, the residual coal in this area was prone to oxidation and at risk of spontaneous combustion.

中文翻译：

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不同开采阶段相邻采空区煤自燃危险区的确定

摘要 煤层开采，特别是在煤柱较窄的巷道掘进时，容易造成沿空空区漏风，增加煤自燃风险。为探索综采工作面邻近采空区氧气分布及煤自燃风险区，进行了程序升温实验、二次氧化实验、瓦斯监测和数值模拟。比较了一次和二次氧化过程中煤样的耗氧率，并监测了相邻采空区内部煤柱的氧浓度。模拟邻近采空区氧浓度分布，确定邻近采空区煤自燃危险区。结果表明，90℃以下煤的二次氧化强于一次氧化，90℃以上煤的一次氧化强于二次氧化。拟合煤样在低于 90 ℃的一次氧化和二次氧化过程中的耗氧率比（即氧化尺寸），以获得该关系。2202工作面沿空空巷掘进过程中，煤柱漏风强度在0.0335～0.0365 cm3/(s∙cm2)之间。发现从煤柱到掘进面后相邻采空区深度 23 m 的区域存在自燃风险。2202工作面正常和末端开采过程中，煤柱沿采空区漏风强度在0.005～0.024 cm3/(s∙cm2)之间。狭小区域内的残煤，87 m 长的相邻采空区处于氧化环境中。工作面缓慢推进时，该区残煤易氧化，存在自燃风险。