Mechanism And Numerical Simulation Research On Foam Ceramics Barrier Suppressing Gas Explosions

All the present gas explosion suppression techniques used in coal mine, such as water barrier, are weak in suppressing shock wave. Moreover, these techniques play a part only for primary gas explosion, while fail to suppress multiple and continuous explosions. With regards to these defects, this dissertation puts forward foam ceramics explosion barrier. Using the wave transmission method of fluid saturated porous medium, propagation of shock wave is numerically simulated when foam ceramics are placed in the heading roadway. The simulation results indicate that, maximum overpressure of gas explosion shock wave can be attenuated to the range safe to personnel and mine facilities in the explosion barrier, thus protecting the personnel and mine facilities to the maximum extent. Then, the mechanism of ceramics barrier doubly suppressing combustion and shock wave is analyzed from the perspective of chemical reaction dynamics, explosion mechanics, material mechanics and shock wave propagation theory. Furthermore, the placement of foam ceramics barrier in different locations of coal mine is explored. The research results lay theoretical grounds for development of foam ceramics barrier suppressing multiple and continuous gas explosions and are of profound application significance.