Effect of the periodic air leakage on spontaneous combustion in the gob of coal mine

Understanding the effect of changing wind speed on the evolution of spontaneous combustion of coal in goaf is crucial for ensuring safety in coal mining. This study focuses on the periodic disturbed airflow generated in the excavation roadway and its impact on the wind speed and goaf of the connected working face. The study reveals that (1) there is a negative correlation between the change of local ventilator wind speed and the wind speed at the working face. (2) the "periodic acceleration" ventilation leads to an increase in temperature at the fixed monitoring point. The maximum temperature is reached later than in normal ventilation conditions. (3) the change period of wind speed is positively correlated with the maximum temperature of the goaf. High wind speeds lead to a greater increase in temperature. (4) the temperature of the monitoring point in the goaf, the maximum internal temperature and the area of coal spontaneous combustion are more sensitive to the "periodic deceleration" disturbance airflow. In conclusion, the findings of this study provide valuable insights for the prevention and control of spontaneous combustion of coal in goaf. It highlights the importance of considering the effects of disturbed airflow in underground coal mining operations.