Numerical simulation of roadway gas migration based on the lattice Bolzmann method

Coal roadway tunneling could result in redistribution of stresses in the coal body around the roadway, and cause the spatially uneven distribution of permeability in the coal body around roadway both in the radial direction and the axial direction. Considering this engineering fact and using the lattice Boltzmann method, the migration law of the gas is studied in the coal body around the roadway. Research shows that: as time goes on, the gas pressure dropped area of the coal body will gradually increases; along the radical direction of the roadway, the gas pressure gradient in the coal body closer to the roadway wall would gradually decrease, whereas the gas pressure gradient in the coal body farther from the roadway wall would gradually increase, and at the locations with stress concentration and low permeability, because the gas flow is easily blocked, it would be likely to cause a higher gas pressure gradient; the model for calculating the gas emission quantity of the roadway is given, and the calculated results can provide the basis for the ventilation design of the roadway.