Influence of Fan and Duct Layout Parameters on the Effectiveness of Tunnel Ventilation and Dust Removal

Abstract

In order to optimize the tunnel inclined shaft press-in construction ventilation scheme and improve the efficiency of dust removal in the tunnel, this paper relies on a tunnel of Zhengzhou West Highway, and adopts Fluent software to establish a 1:1 inclined shaft press-in construction ventilation numerical simulation model, to study the influence of press-in duct air velocity, distance of press-in duct from the palisade surface, and the location of the left tunnel deflector fan on the effect of construction ventilation and verify the results of the simulation through the on-site measured data. The simulation results are verified by field measurement data. The results show that increasing the air velocity of the air duct is favorable to the discharge of dust particles in the tunnel, and considering the dust removal efficiency and energy economy, the ventilation effect of the press-in air duct with air velocity of 22m/s is the best. Tunnel duct from the palm face 20m when the construction of the ventilation effect is better, the best effect on the discharge of dust particles. The inflow fan has a better auxiliary ventilation effect for the migration of dust particles in the tunnel locally and as a whole ; the inflow fan of the left tunnel is the most effective for the discharge of dust particles in the left tunnel when it is set up at 170m from the face of the palms, and the efficiency of the dust removal is improved by 6.73% and 21.64% compared with that at 70m and 270m from the face of the palms, respectively. The monitoring results of the environmental conditions of the construction site after the optimization of the construction ventilation scheme show that the optimized ventilation scheme is effective, which is of great significance in guiding and reference for the future ventilation of tunnel construction. Classification number: U453.5 Literature symbol code: A