Research on Prevention and Control Technology of Coal Pillar Spontaneous Combustion in Coal Mining Face
The 11#coal seam mined in the 11302 fully mechanized mining face is a spontaneous combustion coal seam.The coal pillars in the return airway of the mining face are affected by multiple factors such as mining disturbance and geological structure,resulting in the development of internal cracks and local signs of spontaneous combustion such as temperature rise in the coal pillars.To ensure the safe mining of the 11302 comprehensive mining face and solve the problem of spontaneous combustion of coal pillars in the return airway,a comprehensive approach of coal pillar grouting and coal wall spraying is proposed for fire prevention and extinguishing.The internal air leakage cracks are sealed by coal pillar grouting,and the coal wall spraying isolates the coal pillar from air contact and seals the surface cracks.The grouting and spraying schemes are analyzed in detail.After engineering application,the local high temperature point temperature of the 11302 return airway coal pillar decreased to normal temperature,and there was no further temperature rise in the coal pillar during the subsequent mining period of the mining face,indicating that the on-site coal pillar self ignition prevention and control technology has achieved good results.
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