Experimental study on gas characteristics induced by friction of coal seam roof collapse and gangue
In the process of mining,the roof pressure is reduced,which may lead to roof caving and gangue accumulation,and the possi-bility of gas accumulation will be increased.When the roof collapse and gangue accumulation occur,it may cause the appearance of open flames.There may be combustible substances in the gangue,such as coal and gas,and when an openflame comes into contact with these combustible substances,it will cause a fire.Therefore,this study took the ignition source of low level high pumping roadway as the re-search object,based on the investigation of fire source types and dynamic process test system,and through the friction analysis and test system of gangue collapse and anchor rod caving,the friction ignition characteristics of roof collapse and anchor rod caving were ana-lyzed.It was found that when the contact pressure was the same,when the friction speed increased from low to high,the sliding friction of gangue caused the time and friction distance of gas ignition in the experiment to decrease rapidly.After reaching a certain friction speed,it also decreased slightly,and there was a minimum friction speed and minimum friction distance.The main component of the high extraction roadway in Yuwu Coal Industry was quartz.According to the mechanism of rock collapse impact friction ignition,quartz sandstone has the ability to ignite gas in the high pumping roadway during free fall collapse.Research can provide guidance for the ef-fective prevention and control of high pumping roadway fires and the prediction of explosion hazards.
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