Numerical Simulation Study On The Law Of Disaster Evolution During Mine Disaster

The shockwave caused by gas explosion and high temperature smoke flow caused by fire do serious harm to mine and personnel.In order to reduce the destructive effect of disasters,we had studied the causes and propagation rules of explosion and fire and the disaster characteristics after gas explosion and fire in mine.We used FLUENT software to establish the gas explosion model of tunneling roadway and studied the gas explosion propagation law.After the gas explosion,the shock wave and flame wave propagate to the exit direction,and the pressure and temperature in the roadway rise rapidly.We analyzed the explosion propagation law under different amount of gas involved in explosion,different state of obstacle and closed condition.We built a fire model and studied the spread of high temperature and harmful gas from fire source in the roadway after belt fire occurred in the inlet roadway of working face.When the wind speed is small,the high temperature smoke will spread to the upwind side of the fire source,and the smoke flow will reverse.With the increase of wind speed,the retrograde phenomenon begins to fade,but the spread velocity of smoke on the downwind side of the fire source increases.We analyzed the influence of different fire source scale and roadway wind speed on fire spread.According to the actual situation of the mine,we had studied the safety of the airtight at the inlet and return air after the gas explosion in a mining face.We studied the effect of the number of obstructions and the blocking rate on the overpressure at the sealed area.Through simulation,the eigenvalues of the airtight places were obtained,and the random forest algorithm was used to predict the variation of the eigenvalues of the airtight faces.It is used to optimize the material arrangement in the roadway to ensure the effectiveness of sealing means.To study the temperature distribution and smoke flow spread in the inlet roadway of a mining face after a belt fire.We have a reasonable wind speed range for mine rescue and evacuation.Figure 37;Table 4;Reference 57...