Study on Gas Explosion Propagation Law and Explosion Venting in an Excavation Roadway.

Abstract

Gas explosions are the biggest threat to coal mine safety, which often result in sudden massive destruction. When a gas explosion occurs in a mine, it often causes a large number of casualties and property losses, which significantly restricts the development of the coal industry. In this study, a numerical model was established for the excavation and main roadways under the condition of a forward blasting chamber and a blasting wall, and the law of overpressure propagation and the flame temperature were studied. The results show that the overpressure curve first increases and then decreases with time, exhibiting a fluctuating state, and finally tends to stabilize. The overpressure curve with an explosion venting chamber and explosion venting wall oscillates many times; compared with the roadway overpressure reduced by 10% and explosive impulse reduced by 8.5%, the explosion venting chamber and explosion venting wall have a certain explosion venting effect. The flame temperature exhibits a gradual increase in the early stage, a sharp increase in the temperature at the measuring point, a fluctuation in the temperature curve in the later stage, and a significant decrease after the roadway turns. The explosion venting chamber and explosion venting wall with different explosion venting pressures have a slight effect on the temperature of each measuring point in the roadway after a gas explosion.