Partition of Spontaneous Combustion Danger Zone in Goaf of Mechanized Caving Face Under Drainage Conditions of High Gas-drainage Roadway

Based on the problems that the high gas-drainage roadway resulted in air leakage channel between high gas-drainage roadway and overlying coal rock broken zone in working face goaf, when it effectively controlled gas overrun problem of high gas fully-mechanized caving mining face, which changed the "three zones" of goaf, especially the migration of oxidation heating zone, and made the goaf spontaneous combustion more serious. Through the site measurement and analysis, it took oxygen concentration as the main index and temperature and CO concentration as auxiliary index, then divided the range of "oxidation heating zone" in goaf under high drainage conditions, thus identified the spontaneous combustion danger area and the working face extreme forward speed to prevent residual coal spontaneous combustion in goaf.