Y型通风工作面采空区自燃“三带”分布特性研究
Study on Distribution Characteristics of Spontaneous Combustion “Three Zones” in Goaf of Y-Type Ventilation Working Face

为了研究Y型通风条件下采空区自燃“三带”分布，提出综合指标判定法，在采空区布置束管和温度探测头开展现场监测，分析氧气、一氧化碳、二氧化碳和温度的空间变化特征，综合划分采空区自燃“三带”范围。研究结果表明：随着采空区深度增加，氧气浓度降低，一氧化碳和二氧化碳气体浓度先增高再降低，温度存在上升趋势但并不显著。利用其变化特征划分自燃“三带”，采空区进风侧散热带范围为0~25 m，氧化带25~93 m；窒息带大于93 m；回风侧散热带为0~51 m，氧化带51~101 m，窒息带大于101 m。工作面最小推进速度为0.65 m/d。
To investigate the distribution of “three zones” of spontaneous combustion in goaf under Y-type ventilation conditions, a comprehensive index determination method is proposed. This involves the arrangement of ducts and temperature probes in the goaf for on-site monitoring. The spatial variation characteristics of oxygen, carbon monoxide, carbon dioxide, and temperature are analyzed to comprehensively delineate the range of the “three zones” of spontaneous combustion in the goaf. The research findings indicate that with the increase in goaf depth, the oxygen concentration decreases, while the concentrations of carbon monoxide and carbon dioxide gases initially increase and then decrease, with temperature showing a rising trend but not significantly. Based on these characteristics, the “three zones” of spontaneous combustion are divided as follows: the cooling zone on the inlet side of the goaf ranges from 0 to 25 meters, the oxidation zone ranges from 25 to 93 meters, and the suffocation zone is greater than 93 meters; on the return air side, the cooling zone ranges from 0 to 51 meters, the oxidation zone ranges from 51 to 101 meters, and the suffocation zone is greater than 101 meters. The minimum advancing speed of the working face is 0.65 meters per day.