Comprehensive fire prevention and extinguishing technology for coal seams in complex geological structures

To address the high-risk problem of coal seam spontaneous combustion caused by complex geological conditions such as igneous rock intrusion and fault development in the 1205 working face of the North Second Mining Area of Daxing Coal Mine. Through detailed analysis of geological structure, the comprehensive technical scheme focusing on "monitoring and early warning, plugging and air control, covering and oxygen isolation, and inerting cooling" was integrated. The bundle tube monitoring system was used to analyze the gas composition in real time, and river sand filling and high-density foam were used to plug the air leakage passage and cover the remaining coal, and the coupling injection of carbon dioxide and nitrogen was introduced to realize three-dimensional inerting in the goaf. On site application shows that there were no spontaneous combustion accidents during the mining period of the working face, and the safety progress has been improved. The research results have formed a working face fire prevention and extinguishing technology system suitable for complex geological conditions, significantly improving the ability of mine fire prevention and control, and providing technical basis and practical experience for safe mining of coal seams under similar conditions.