矿山巷道掘进爆破粉尘运移规律数值模拟研究OA

In order to study the factors affecting the efficiency of dust removal in the process of mine roadway exca-vation blasting,taking the roadway excavation blasting of a metal mine as the background,the pressure ventilation model of roadway blasting was constructed,and the air flow field and dust concentration distribution of heading face were numerically simulated by ANSYS Fluent software.The results show that during the process of air flow from the outlet to the heading face,the air flow velocity gradually decreases,and the backflow phenomenon will occur after the air flow reaches the heading face.After blasting,the dust migrates to the roadway exit with the air flow,and migrates to the roadway entrance at 410 s.With the increase of air volume,the time required for dust removal is obviously shortened,and the dust concentration in the roadway decreases.With the increase of the distance between the air outlet and the heading face,the return flow area of the roadway increases,forming a high concentration area.With the increase of ventilation height,the dust removal effect is also improved.When the ventilation air volume is not less than 5.0 m3/s,the distance between the air duct outlet and the tunneling face is 20 m,and the height of the air duct is 2.7 m,the dust removal effect of the tunneling blasting in the metal mine is the best.