Study On Aerodynamic Effects And Mitigatory Measures For High-Speed Railway Tunnel With Underground Station

In recent years, China makes great efforts to develop the inter-city rail transit and passenger special line, in order to reduce urban land use and protect the urban living environment, the way of using tunnel with an underground station through the city often be accepted, so the construction of underground railway stations will gradually become a new trend of railway transport development. As the railway stations built in underground, its multi-lines and multi-platform, high-speed trains through the station(non-stop), and other factors will inevitably lead to a series of aerodynamic problems and threaten the safety of passengers and staff. So proving up the laws of the high-speed railway underground stations' aerodynamic effect and the corresponding mitigation measures in engineering is valuable both for academia and application.In this paper,the East of Hainan Meilan Airport Link railway tunnel's and underground station's aerodynamics research project is made as the background, use the mature application of numerical simulation and model experiment methods for high-speed railway tunnel aerodynamics, organize and implemente the numerical simulation and model experiments that can simulate the the entire process of high-speed trains passing through tunnel and underground station, explore the aerodynamic environment such as the pressure fluctuation, transient pressure and wind speed in the tunnel and station with the different design parameters, the purpose is making reasonable advice and some guidance for the design and operation underground stations on the high-speed railway tunnel. The main contents of this paper are as follows:1. The laws of how did the tunnel's length impact the station's aerodynamic effects such as pressure transient has been explored,then the discriminants of "the most unfavorable tunnel length" of the tunnel with station was deduced, the trains'pasing through the underground station with different tunnel lengths was simulated by three-dimensional numerical simulation and its research findings was used for making a simple evaluation of the existing tunnel with station projects.2. With three-dimensional numerical simulation,the impact of the aerodynamic environment of the station with or without the wall-separating and the wall-separating's length was analyzed,and the design parameters of wall-separating was set down,then how did the trains' intersection location impact the aerodynamic environment of the station with wall-separating was research as well,at last the aerodynamic effects of the station with wall-separating on various operating conditions was analyzed,and some advice was given for its opration.3. With model experiment, the characteristics how did the hood structure and its formatand and the parameters of the step-down shaft on tunnel impact the aerodynamic environment of the station has been investigated,then the aerodynamic environment of the station-engineering-project was simulated by three-dimensional numerical simulation with both the hood structure and the step-down shaft integrated application,and its aerodynamic environment was evaluated as well.