Numerical Simulation Study on the Influencing Factors and Laws of Gas Emission in Coal Mine Excavation Face

In order to clarify the influencing factors and variation rules of gas emission in the excavation face, the 4301-working face of the East Well of Sihe Mine was taken as the research object. Through laboratory experiments, the influence characteristics of coal structure and gas content on gas emission rate were analyzed. Furthermore, the COMSOL Multiphysics numerical simulation software was used to investigate the influence of gas pressure, excavation speed, and soft layer thickness on the gas emission rate of the excavation face. The research results show that the gas emission rate is not only affected by the coal structure and gas content, but also by gas pressure, excavation speed, and soft layer thickness. The amount of gas emission is positively correlated with gas pressure, and the higher the gas pressure, the greater the amount of gas emission. The gas emission rate increases linearly with the excavation speed, and the influence of soft layer thickness on the gas emission rate increases with the increase of excavation speed.