Abstract：In order to explore the propagation mechanism of underground gas explosion shock wave and ventilation dynamic coupling, Fluent software was used to simulate the propagation state of explosion shock wave in roadway under mine ventilation. The results of numerical simulation showed that when the shock wave propagates in the bottom pipe, the decreasing trend of explosion pressure decreased with the increase of propagation distance. The propagation law of shock wave in the pipe network was consistent with that in the straight pipe, that was, the closer to the explosion source, the higher the overpressure value. Due to the influence of the disturbance source of the bifurcated pipeline, the shock waves in different pipelines continued to interact, resulting in different overpressure attenuation coefficients than those in the straight pipeline. At the same time, the overpressure changed process and the peak distribution characteristics of overpressure shock wave in different straight pipes were also different from those in straight pipes.
