Investigation and Influencing Factors Analysis of “Three Zones” in Sikeshu Coal Mine

In order to study the influence of spontaneous combustion “three zones” factors distribution in goaf, the A₅04 working face of Sikeshu Coal Mine in Wusu city of Xinjiang Autonomous Region was taken as the research object to inspect the spontaneous combustion “three zones” in the goaf. A combination of on-site investigation and numerical simulation was used to study the functional relationship between oxygen concentration, gas concentration and distance to the working surface, and the relationship between the width and position of spontaneous combustion zone and the air volume and propulsion of the working surface. The results show that oxygen concentration and gas concentration in the goaf of the A₅04 working face are linear relationship with the distance to the working surface. When the working face air volume changes, the width of the spontaneous combustion zone itself does not change much, but when the air volume decreases, the overall position of the spontaneous combustion zone will approach the working face, and when the air volume increases, it moves deeper into the goaf; with the increase of working face advance rate, the spontaneous combustion zone will move to the deep part of the goaf, and the starting and ending position, width and propulsion of the working face advance rate will have a power function.