Practice of Fire Prevention and Extinguishing in Adjacent Goaf of Thick Coal Seam Small Coal Pillars Roadway Excavation Along Goaf
In view of the risk problem of spontaneous combustion in adjacent goaf of thick coal seam fully mechanized small coal pillars roadway excavation along goaf existing in the 7304 working face of Zhaolou Coal Mine,by analyzing the damage characteristics and permeability changes of small coal pillars,the deformation and failure of small coal pillars and their impact on air permeability under lateral support pressure action in goaf are revealed;By studying the distribution characteristics of oxidation zones in goaf,the key areas for preventing and governing spontaneous combustion are identified.Based on this,comprehensive prevention and governance measures such as blocking air leakage channels,injecting loess consolidation agents,nitrogen injection and others are proposed.Blocking air leakage channels reduces oxygen supply by cutting off continuous air leakage and oxygen supply channels;Injecting loess consolidation agent reduces air leakage by increasing coal body compactness;Nitrogen injection technology prolongs the oxidation time of coal and reduces the possibility of spontaneous combustion by reducing the oxygen content and temperature around the broken coal body.The practical results show that the above measures significantly reduce the risk of spontaneous combustion in goaf and ensure the safety production of the mine.
small coal pillarroadway excavation along goaffire prevention and extinguishing
国家科技期刊平台
NSTL
万方数据
