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Numerical study of the methane backward flow in coal mine tunnels after a methane outburst is necessary to the engineering design and emergency rescue. In this paper, we introduce Lattice Boltzmann Method (LBM) coupled with the Large Eddy Simulation (LES) model to simulate the methane backward flow in the air-intake tunnel of twin-tunnel construction in the coal mine after the methane outburst and analyze the effects of the inlet air velocity, the intensity of the methane outburst and the width of the tunnel to the distance that the methane can flow backward. It demonstrates that with the increase of the inlet air velocity, the distance that the methane can flow backward decreases. With the increase of the intensity of the methane outburst, the distance that the methane can flow backward increases. There exist linear relationships between the inlet air velocity, the intensity of the methane outburst and the distance that the methane can flow backward. The change of the tunnel width has almost no influence on the distance that the methane can flow backward.

Lattice Boltzmann simulation of the methane backward flow in coal mine tunnels after methane outburst