Numerical Simulation of Influential Factors Optimization of Gas Migration at Fully Mechanized Caving Face

Orthogonal test design was proposed to investigate the impact of advance speed, air distribution volume and upper corner induced draft quantity on gas concentration distribution. The results of numerical simulation and orthogonal test showed that the largest impact on relative gas emission at caving face was advance speed, followed by upper corner induced draft volume, and air distribution volume is the smallest influential factor. The minimum relative gas emission at caving face occurred when advancement speed, air distribution volume, upper corner induced draft quantity was 5 900 t/d, 2 600 m³/min and 330 m³/min, respectively. Combining observed data with numerical simulation results, the results indicate that it is feasible to apply Fluent software to get the optimal combination of the three factors at fully mechanized caving face.