Influence of Ventilation Duct Parameter Optimization on Pollutant Diffusion in Spiral Tunnels

The spiral tunnel could flexibly design the curvature and slope of according to geological structure, avoiding adverse effect complex terrain topography, had a strong advantage in engineering applications. Different from ordinary straight linear tunnels, tunnels have circular trend with obvious slope, which ensures certain differences between construction ventilation two types especially terms air flow field pollutant diffusion. Relying on actual project, this paper studies diffusion mechanism pollutants construction. Optimization layout duct based numerical simulation proposed pulsating method was performed improve drainage tunnel. time reach carbon monoxide concentration after blasting, dust during spraying process, were determined as indicators measure period. hanging position duct, distance outlet palm face, speed main factors affecting effect. factors, degree influence sensitivity each influencing factor index, are studied, optimal scheme suitable for site is determined. can quality provide effective reference problems other tunnels. Meanwhile, more need be examined study impact construction, physical models needed