Research on gas pressure relief range of gob-side entry driving coal rib in Fengyang Coal Mine
Gob-side entry driving technology can greatly increase the utilization rate of coal resources,reduce the maintenance cost of roadway,reduce the local anti-outburst engineering of driving working face,and promote mine safety.In order to ensure the scientific and reasonable prevention and control of coal and gas outbursts in the mine,taking the No.11104 return airway coal seam of Fengyang Coal Mine as the research object,the changing trend of gas content in the coal rib of the excavation roadway in the unstable flow field was ex-plored,and the width of the pressure relief zone was calculated.The results show that the width of the gas content reduction zone after gas emission can be estimated by 3～4 times of the roadway width,and the width of the pressure relief zone of the No.11104 return air-way along the goaf strip coal pillar should be at least 13～16 m.The effective pressure relief range of goaf strip coal body only includes the fracture zone and most of the plastic zone.The theoretical pressure relief width of the goaf strip coal body in the No.11104 return airway of Fengyang Coal Mine is calculated to be 20 m.It is determined that the effective pressure relief width of coal body in the gob-side entry driving strip of the No.11104 return airway is 30 m,and the risk of coal and gas outburst has been eliminated within a 20 m range of the lower side of the No.11104 return airway.
gob-side entry drivingcoal body pressure reliefstriped coal bodyFengyang Coal Mine
万方数据
维普
