110 Construction Method Goaf Air Leakage Control and Coal Spontaneous Combustion Zoning Prevention and Control Technology
In response to the complex air leakage channels and difficulties in preventing coal spontaneous combustion in the goaf of Huangling No.1 Coal Mine in Shaanxi Province under the"two in and one return"ventilation method,numerical simulation combined with on-site measurement was conducted to analyze the influence of ventilation volume on the air leakage law and oxygen concentration distribution.A 110 construction method was proposed to control air leakage in the goaf along the goaf and prevent coal spontaneous combustion in different zones.The research results indicate that under the"two in and one return"ventilation mode,the range of air leakage in the goaf increases with the increase of auxiliary transportation channel air volume,and the oxygen concentration in the goaf on the auxiliary transportation channel side is greater than that on the inlet channel side;an increase in the air volume of the inlet duct will also produce a similar phenomenon,but it is not significant compared to the change in the air volume of the auxiliary transport duct.The on-site observation results show that the oxygen concentration measurement point in the inlet channel of the 1009 working face decreased to 18％at 125 m,and the oxygen concentration decreased to 8％at 273 m.The oxygen concentration at the auxiliary transportation channel measurement point decreased to 18％at 300 m,which is basically consistent with the simulation results.Based on the actual situation on site,a goaf fire prevention and extinguishing process integrating"isolation,plugging,inerting,blocking,and emergency"is proposed.The research results are of great significance for the prevention and control of goaf air leakage and coal spontaneous combustion disasters.
110 construction methodgoafair leakage lawcoal spontaneous combustion prevention and governance
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