Optimization of Reasonable Size of Coal Pillar Protection in Thick Coal Seam Roadway
In response to the problem of excessive width of the protective coal pillar in the main roadway of the 12308 mining face of Hongqingliang coal mine,which leads to the waste of coal resources,the stress distribution law of the coal pillar in the front section of the working face was analyzed through numerical simulation.The reasonable width of the protective coal pillar in the main roadway was obtained to be between 100 and 150 m.Through pressure monitoring of the anchor support on the roof of the 12308 return air passage,it was found that the width of the protective coal pillar in the main roadway should not be less than 121 m,by analyzing the stability of coal pillars through ultimate strength theory,the width of the protective coal pillars in the main roadway of the 12308 mining face was ultimately reduced from 200 m to 125 m.By monitoring the stress in the boreholes of the north wing return air roadway after mining was stopped,the safety and rationality of the 125 m wide roadway protective coal pillar were further verified,greatly reducing the waste of coal resources.
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