我国大多数矿区都含有多层近距离可采煤层。在开采近距离煤层群时，由于邻近层工作面之间存在漏风，使煤层自燃危险增加。因此，必须加强近距离煤层群开采过程中煤层自燃防治理论和技术的研究。 开展了东荣二矿煤层自然发火实验，测定了煤的自燃参数，对近距离煤层群开采下部煤层综放面进行了观测，得到了采空区遗煤状态、气体浓度等的分布。通过数值方法求解复合煤层采空区渗流、扩散和化学反应耦合的三维稳态数学模型，得到常温下采空区氧浓度及渗流速度场的分布。结合大型煤自然发火实验得到的煤自燃下限氧浓度、上限漏风强度、极限浮煤厚度等参数及煤的实验自然发火期，划分出开采下部煤层时上部煤层煤柱及采空区自燃危险区域，再结合工作面推进速度，预测自然发火期。采用这种方法对东荣二矿采煤工作面顶部煤层煤柱自燃预测，得到进风侧的煤柱氧化升温区处于距离工作面50m~140m处，回风侧为距离工作面50m~85m处，工作面推进速度大于1.6m/d时，煤柱无自燃危险，工作面停止推进但正常通风38d后，煤柱进风侧将首先发生自燃。该预测结果与现场实际情况吻合良好。 根据预测的自燃危险区范围，对东荣二矿近距离煤层群自燃火区采取了注复合胶体、注液态二氧化碳等防灭火技术措施，扑灭了火区，保障了工作面支架的安全回撤，取得了明显的经济社会效益。

Near-neighbored coal seams exist in many coalfields in China. The danger of coal spontaneous combustion increases due to air leakage between the adjacent coal seams. It is important and necessary to strengthen studing preventing and extinguishing theory and techniques against spontaneous combustion during mining near-neighbored coal seams. Spontaneous combustion modeling experiment is carried out to test self-ignition parameters of the coal sample from Dongrong No2 coalmine. Loose coal depth and species distribution are obtained through observation in the workface. A numeric algorithm is taken to solve coupled steady model of air flow, diffusion and chemical reaction in multi-layer neighbored coal seams and rocks, oxygen concentration and flow velocity magnitude in different position is obtained. Oxygen concentration and flow velocity together with loose coal thickness are compared with their critic value obtained from large-scale coal spontaneous combustion experiment to determine spontaneous combustion danger zone. Connecting the result with velocity of the mining workface and the experimental spontaneous combustion duration, date of spontaneous combustion can be predicted. The method is employed to predict spontaneous combustion in coal pillar during mining the adjacent substrate coal in Dongrong No.2 coalmine successfully. The result showed that self-heating zone lies in 50m~140m in the airflow inlet side and in 50m~85m in outlet side away from the workface in the coal pillar. If moving velocity of the workface is larger than 1.6m/d, there is no danger of spontaneous combustion; while if the workface stopped to move but ventilation kept normal for 38 days, spontaneous combustion will take place in airflow inlet side of the pillar. It proved that the method of predicting coal spontaneous combustion accord with real condition well. A spontaneous combustion fire takes place in Dongrong No. 2 coalmine. Composite gel and liquefied carbon dioxide are injected into the predicted fire zone to extinguish the fire successfully, which guaranteed safety backout of the equipment in the workface. The economic and social effect is obvious.