Study on the influence of the extraction rate of highly-located drainage roadway on compound disaster prevention in goaf

In order to study the use of highly-located drainage roadway to prevent the occurrence of compound disasters in goaf in gassy mine, this paper takes the engineering geological conditions of 13190 working face in Tashan Coal Mine of Datong, Shanxi Province as the background, through the means of field investigation, theoretical analysis, numerical simulation and industrial test, the air quantity distribution, gas control effect and oxidation zone width of 13190 working face were analyzed. The results show that:with the increase of drainage rate, the safety of ventilation and dilution of gas is ensured, but at the same time, the increase of air leakage makes the width of oxidation zone increase. Based on the risk assessment of the change of CH₄ volume fraction, air leakage volume and oxidation zone distribution in goaf, the reasonable drainage rate is determined to be 180 m³/min, which is verified by field industrial tests. The research results provide a basis for the optimization and adjustment of the drainage rate of highly-located drainage roadway in the process of mining under similar conditions.