采空区自燃三带时空演化特征与防治技术研究

针对红会一矿1715综放工作面采空区外因火灾隐患,从时空演化的角度分析了工作面具体冒落情况,优化了工作面采空区孔隙率、渗透率动态分布模型,结合COMSOL数值模拟软件计算了该工作面推进不同阶段采空区三带范围及漏风情况,提出了适宜该工作面的时空联合火灾治理措施。结果表明：总配风量一定情况下,“两进一回”W型通风方式“三带”范围比U型通风方式更小,后者漏风情况更为严峻,自燃发火隐患更大|而采用“两进一回”W型通风方式后,随总配风量增加,自燃三带范围增加且向采空区深部延展,最终确定进风巷风量为300m/min、辅助通风巷风量为400m/min的配风方案为该工作面火灾治理期间最佳通风方案,自燃区域最窄|依据时空联合防治技术方案,于1715工作面进行了现场验证,1715工作面外因火灾隐患得到了有效解决,对国内类似火情治理具有重要借鉴意义。

Study on Spatiotemporal Evolution Characteristics of Three Zones of Spontaneous Combustion in Goaf and its Prevention and Control Technology

Abstract: Aiming at the potential fire hazard outside the goaf of 1715 fully mechanized top coal caving face in Honghui No. 1 coal mine, the specific caving situation of the working face is analyzed from the perspective of temporal and spatial evolution, the dynamic distribution model of porosity and permeability in the goaf of the working face is optimized, and the three zone range and air leakage of the goaf in different stages are calculated combined with COMSOL numerical simulation software, The space-time combined fire control measures suitable for the working face are put forward. The results show that when the total distribution air volume is certain, the "three belt" range of "two in and one return" W ventilation mode is smaller than that of u ventilation mode, and the air leakage of the latter is more serious and the hidden danger of spontaneous combustion is greater; After adopting the W-type ventilation mode of "two inlets and one return", with the increase of total air distribution volume, the range of three spontaneous combustion zones increases and extends to the deep part of goaf. Finally, it is determined that the air distribution scheme of 300m3/min air inlet roadway and 400m3/min auxiliary ventilation roadway is the best ventilation scheme during fire control of the working face, and the self combustion area is the narrowest; According to the time-space joint prevention and control technical scheme, the field verification was carried out in the working face, and the potential fire hazards outside 1715 working face were effectively solved. It has important reference significance for similar fire control in China.