| Qinghai-Tibet plateau is located in the central Asia continent and special for its high elevation, low pressure, low oxygen content and high wind speed. With the development of the Qinghai-Tibet plateau, the construction of the Qingzang railway is carried on vigorously. So, the special plateau climate proposes new problems to the operation ventilation. The locomotives running in the tunnel are tracked by internal combustion engine.The research object is new built Lhasa-Rikaze railway tunnels. Related problems of the plateau tunnel ventilation are researched. Combine with the plateau's special climate, the control standard about the concentration of harmful gas in the operation tunnel are discussed. The one-dimension unsteady flow theory is used for calculate air flow velocity and pollutant concentration. On the base of the calculation, the highway tunnels' ventilation designs using the natural wind and using the service gallery are analyzed. And compared with the current codes, the ventilation designs' feasibility, applicability and optimization suggestion are illustrated.The ventilation mode of blowing and exhausting using service gallery will be adopted in the long tunnels on Lhasa-Rikaze line. When doing the ventilation, the local effects will influent the ventilation's performance. So, utilizing the CFD software, the important parts of the tunnel ventilation system are simulated and analyzed. The influent factors of short duct, exhaust air rate and connecting tube are researched and analyzed. In addition, the cross pollution of the tunnel openings are researched. The flow of pollutant between two tunnels openings is simulated.
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