Study on leaky gas control from upper adjacent coal seam of Y style ventilation protective coalface mining

摘要

In order to control coalface gas contend under the limitation, the source of gas in goaf was analyzed, and vertical hierarchical control method was given under the circumstance of protective coal seam mining.On the basis of similar simulation results, gas flow range was identified, and porosity and resistance of air flow in this area were calculated.So goaf gas field of different solution, such as Y ventilation, Y ventilation + buried pipe in goaf and Y ventilation + buried pipe in goaf + high level gas drainage tunnel + high level drainage boreholes were simulated by Fluent software.The results show that, goaf gas concentration in the vertical direction and horizontal direction are typical successive characteristics;suitable location of high level drainage tunnel is conductive to extract upper adjacent layer coal seam gas;and buried pipes along the goaf filling wall can intercept goaf gas flow into gob-side entry, and reduce the gas concentration along the alley.