Analysis on Gas Control Effect Based on Gateway Retained Along Goaf Y Type Ventilation

Abstract：Due to the Y type ventilation in the pillarless gateway along the goaf of the high gassy mine could be favorable to solve the gas over limit of the coal mining face and gently release the production connection tension and others than the conventional U＋L and U type ventilations,the paper introduced the applied results of the Y type ventilation technology to the gateway retained along the goaf of No.18205 coal mining face in Tunlan Mine.The results showed that after the Y type ventilation technology applied to the gateway retained along the goaf,the ventilation capacity and the safety production reliability of the coal mining face was highly improved.Meanwhile with the floor gas drainage operation conducted,the floor gas emission phenomenon in No.18205 coal mining face was eliminated and with the ventilation in the coal mining face,the gas emission was reduced from 3~4 m3/min.In comparison with the floor gas drainage operation uncompleted,the gas drainage was reduced by 15%~20%.The gas drainage rate of the coal mining face would be improved from 60% to over 70%.The gas volume fraction of the floor and the air return of the coal mining face would stabilized below 0.5% and the gas control effect was excellent.