Study on the migration law of gas explosion disaster products in complex air network of mine

Abstract

ABSTRACT Underground mine gas explosion will produce a shock wave and harmful gas at high temperatures. Firstly, this paper studies the attenuation formula and attenuation coefficient of the shock wave. Comparison and analysis of three shock wave attenuation formulas based on experimental burst data from two large tunnels. It is found that the shock wave attenuation formula of the dimensional method agrees well with the experimental data. Based on the gas explosion accident at the Tunlan Mine. The calculated shockwave pressure on the blast shield is 78,915 N, which is greater than the mass of the explosion-proof cover itself at 35,280 N, the same as the fact that the explosion-proof is jacked up observed in the accident report. The accuracy of the shock wave attenuation formula and attenuation coefficient is verified. Secondly, based on the dispersion theory, the migration law of harmful gas after an explosion is analyzed, and the superposition and separation law of harmful gas in branch roadway is studied. Taking CO as the index gas, the concentration change of CO near the explosion source of Tunlan Mine is analyzed by using Ventsim software. Simulation results show that the maximum peak values of monitoring points 5 and 6 of branch roadways are 9000 ppm, which is the same as the maximum peak concentration of monitoring point 1. And the maximum peak values of monitoring points 3 and 4 are 13300 ppm, which is the same as the maximum peak concentration of monitoring point 2. The simulation results confirm the gas migration law of branch roadway. Studying the attenuation law of explosion shock waves and the propagation law of harmful gas can reduce the unnecessary loss caused by blind rescue and provide theoretical support for formulating a mine emergency rescue plan. It also provides a basis for developing underground anti-shock wave buffer facilities.