Study on gas control of corner angle in Gaohe energy high gas fully mechanized caving face

In order to solve the problem of gas overrun in the deep high gas fully mechanized caving face, aiming at the actual geological conditions and mining technology level of the W1309 fully mechanized caving face of Gaohe mine, the problems existing in the double U-shaped ventilation system of the working face are analyzed, and combined with the advantage of the working face Y type ventilation, the gas prevention and control mode of the working face of “Y+high pumping lane” is proposed.In order to give full play to the advantages of Y-type ventilation and high-drainage, the optimal position of high-drainage roadway is determined.The Fluent software is used to simulate and analysis the gas distribution of different working distances and goafs in different working distances and high-level roads.The results show that in the case of the distribution ratio of the main air inlet and exhaust duct of the Y-type ventilation is 2.09:1, the gas concentration gradually increases with the goaf extending deep, and tends to be stable about 100 m away from the working surface.When the high pumping roadway is arranged 30 m above the coal seam floor and the gap zone with the return airway groove is 25 m, the gas drainage effect is the best, the extraction pure volume reaches 18.52 m³/min, and the highest extraction concentration is 8.11%, and the gas concentration of the upper corner is 0.61%.Through on-site monitoring and recording data, it is concluded that the field data is basically consistent with the simulated values, and the reliability of the numerical simulation results is verified, which provides theoretical guidance for the upgrading of the gas prevention and control system on the working surface.