| Summary: | This study was conducted to analyze the influence of outburst power from coal and gas on mine ventilation systems in order to avoid damage from secondary disasters to mine ventilation systems. Through the outburst dynamic experiment of a simple ventilation network system, the unsteady movement characteristics of mine air flow under the combined action of gas outburst source flow and fan ventilation are studied. In this study, the “11.8” coal and gas outburst accident that occurred in the Qunli Coal Mine was simulated numerically. The TF1M simulation program was used to analyze the entire process of the diffuse flow of the countercurrent and outburst gas in the mine ventilation system as well as the dynamic change process of the natural wind pressure in each stage. The results indicate that the power of the outburst source causes the ventilation system to run against the current, the gas in the air intake system of the mine exceeds the limit, and the airflow disturbance of the mine ventilation system is influenced by natural gas pressure and fan pressure. The air pressure of the fan cannot change the rate of air flow but can reduce the time of air flow disorder and promote the gas discharge in the ventilation system. In a word, the research achievements do have important theoretical and practical significance for disaster prevention and aid in outburst mine as well as effectively preventing the occurrence of secondary disasters.
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