多漏风通道采空区自燃“三带”划分研究

Study on the Delineation of the"Three Zones"of Spontaneous Combustion in the Mining Zone with Multiple Leakage Channels

为研究多漏风通道条件下采空区氧浓度分布规律,采用数值模拟对四种漏风情况下采空区自燃“三带”进行划分,并通过现场实测数据验证了模拟的准确性。结果表明:漏风导致氧化带向采空区深部移动,且漏风量随工作面向前推进逐渐增加,当采空区氧气浓度降低至8%时,进、回风侧到工作面距离由Ⅰ阶段的245m、140m,增大至Ⅳ阶段的420m、470m;2091工作面1、2号束管监测点与Ⅰ阶段数值模拟结果误差小于5%。该研究成果能够为类似漏风条件下采空区煤自燃的针对性防治提供理论基础及有力参考。

In order to study the distribution law of oxygen concentration in the goaf under the condition of multiple air leakage channels,the numerical simulation was used to divide the spontaneous combustion"three zone!"in the goaf under four air leakage conditions,and the accuracy of the simulation was verified by the field measured data.The results show that the air leakage leads to the movement of the oxidation zone to the deep part of the goaf,and the air leakage rate increases gradually with the advance of the working face.When the oxygen concentration in the goaf decreases to 8%,the distance from the intake and return air sides to the working face increases from 245 m and 140 m in the first stage to 420 m and 470 m in the fourth stage;The error between No.l and No.2 beam tube monitoring points of 2091 working face and the numerical simulation results of stage I is less than 5%.The research results can provide theoretical basis and powerful reference for the targeted prevention and control of coal spontancous combustion in goaf under similar air leakage conditions.