Analysis on Working Face Water Infusion of Extremely Thick Coal Seam in Compound Disaster Mines

The Qianqiu coal mine 21141 working face is typical extremely thick coal seam fully mechanized caving face with serious rock burst risk and easy spontaneous combustion coal seam.The paper introduces the methods including two-way long-drilling water injection method,coal wall shallow hole water injection method,two-roadway drilling filed water injection method,roof high level drilling field water injection method and fire prevention engineering hydrostatic water injection method.The coal seam water injection plays comprehensive preventive and control effects in rock burst prevention,dust,fire prevention and extinguishing,gas drainage and other disasters according to the field measurement,which achieves the goal of "multi-application of a measure".