| City rail traffic has the characteristics of convenient,reliable,environmental protection and energy saving,large transport capacity,the subway in the public transportation system of the large and medium city is playing an increasingly important role.As a passenger distribution center,the subway station’s space is relatively closed,and has a slow internal air circulation,which will have a great impact on the comfort of passengers taking the subway.At the same time,in the process of the design of the subway control system,we have to consider the impact on the internal environment,and the impact of the station safety factors as well.Therefore,many factors should be considered when evaluating the thermal environment of the station,and make complete analysis of complex operating modes.The subway tunnel is an important part of the subway system,which also has a very important influence on the station thermal environment,the internal thermal environment changes and interaction process between the internal air and the surrounding rock is very complicated.In this paper,research analysis and control scheme are based on simulation of thermal environment in Beijing subway.We choose Fuxingmen station as the research object,using the method of questionnaire investigation,field measurement and numerical simulation are combined to study the station of thermal environment.Use BIM(Building Information Modeling)technology as the base to establish the three-dimensional model relatively perfectly.And use computational fluid dynamics(CFD)software to simulate and analyze the thermal environment of the station and the temperature field of the tunnel.The main research contents of the paper are:first,analyze the heat source in the subway and the classification calculation and analysis of the source.Second,make thermal comfort questionnaire to the passengers on the platform and take data measurement.Third,make simulation on station thermal environment comfort.Make comparison of the effects of ventilation system and the safety doors in the thermal environment control.Fourth,make numerical simulation and prediction of tunnel temperature field,analyze the influence of interval change on tunnel temperature field.Through the research,this thesis acquired the influence of ventilation system and the security gate on the station temperature and air distribution,basically grasped the influence of different departure intervals on the distribution of temperature field in surrounding rock of tunnel.When the station ventilation system is closed,the site environment will deteriorate rapidly.To some extent,the safety door system can adjust the air flow and temperature,but the effect is limited.Shortening the departure interval will not have a greater impact on the temperature field of the surrounding rock of the tunnel,but it will bring great pressure to the temperature control of the station. |
