Determination and practice of coal pillar width for stopping mining
Yanzishan Mine adopts wide coal pillar to protect roadway,and the width of coal pillar is about 60m,which causes serious waste of resources.Through the monitoring and analysis of the stress change law of return air roadway in Yanzishan Mine,it was concluded that the critical distance of the influence of working face mining on roadway pressure was 35 m.On this basis,on the basis of comprehensive consideration of the particularity of No.8210 Face,Yanzishan Mine analyzed that the optimum width of stop pillar in this working face was 38～45 m.In order to test whether the coal pillar width of No.8210 Face was 38～45m or not,Yanzishan Mine carried out the roof drilling peep work in the return air roadway to detect the changes of the roof coal seam during and after the stop of mining.The peep detection results showed that the coal pillar width of 38～45m in the working face could effectively ensure that the surrounding rock of the roadway was not damaged,which was safe and reliable.
fully mechanized top-coal caving facecoal pillar for stopping miningresistance detectionroof peep
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