Study on the distribution characteristics of the"three zones"of spontaneous combustion in goaf affected by the ventilation volume of coal mining face
QIN Ruxiang
MA Yingjie
ZHAO Xingguo
SHEN Tao
Abstract：To study the influence of working face air volume on the distribution of the spontaneous combustion"three zones"in the goaf,the critical oxygen concentration of these zones was determined based on the charac-teristics of the low-temperature oxidation process of coal.Using the 823 working face of Yuandian No.1 Coal Mine as the research object,the range of the spontaneous combustion"three zones"in the goaf was measuredon-site.To explore the effect of the changes in air volume at the mining face on these zones,the dis-tribution characteristics of the spontaneous combustion'three zones'in the goaf under varying air volumes and plugging measures were simulated after constructing a model with COMSOL software,considering air leakage in the goaf.The results indicate that as the air volume at the working face increases,the distribution range of the oxidation zone in the goaf extends deeper,the width of the oxidation zone increases,,and a critical air volume of 1734 m3/min is identified.When the air volume exceeds this critical threshold,the width of the oxidation zone in the goaf increases more significantly.Following the implementation of plugging measures,the distribu-tion range of the oxidation zone in the goaf is notably reduced.As the length of the plugging retaining wall in-creases,the width of the oxidation zone in the goaf decreases.Considering practical site conditions,the length of the plugging retaining wall is set at 20 m.
Keywords：air volumegoaf"Three Zones"of spontaneous combustionnumerical simulation
Publication Date：2025-10-30
Online Publishing Date：2025-11-06(First online date of this platform, not the publication date of the document)
Pages：9( 38-46 )