Influence of W-type and U-type ventilation methods on working face

To study the influence of U-type ventilation and W-type ventilation on working face and goaf, the monitoring data of gas, carbon monoxide, carbon dioxide, and other gas concentration and air volume in working face 9-204 and 9-211 of Dianping Coal Mine were systematically analyzed. The results show that under the W-type ventilation mode, the air leakage of the working face is small, which will not cause gas accumulation at the upper corner and the end; there is no spontaneous combustion in the gob of these two working faces, so the advancing speed of these work face matches the spontaneous combustion period; the oxidation degree of the coal left in the gob with U-type ventilation is slightly higher than that with the W-type ventilation.