Research on Ventilation and Dust Diffusion During Construction of Long Tunnel by Drilling and Blasting Method
This article took the Liqi Tunnel of the Hangzhou-Wenzhou High-speed Railway as the research object,and studied the problems of poor ventilation conditions and high dust during the construction of long tunnels using drilling and blasting methods.Research has found that the dust generated by large-scale construction is difficult to be quickly discharged,and the monitoring data at various monitoring points along the tunnel indicate that the dust concentration decreases slowly after reaching a certain peak.A ventilation system optimization scheme was proposed for air purification using an under construction tunnel sewage wind dust removal,desulfurization,and denitrification treatment device(patented)and a tunnel relay wind box device(patented)to increase the air volume inside the tunnel.The dust diffusion law was analyzed and verified on-site in the large working area in front of the initial lining platform.The results indicate that:(1)the feasibility of the scheme has been verified through simulation and on-site installation testing;(2)this scheme accelerates the flow velocity of wind in the working area of the tunnel and to some extent weakens the large-scale eddy currents near the tunnel surface;(3)this scheme accelerates the migration of dusty gas towards the outside of the tunnel,and the simulation shows a 37.5%increase in migration efficiency.
long tunnelnumerical simulationdust diffusionventilation system
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