Study On Aerodynamic Effects For Badaling Underground Station Of Beijing-Zhangjiakou Intercity Railway

In recent years, with the rapid development of high-speed railway, China has stepped forward the time of high-speed railway. In order to resolve the contradiction between the thin city land and people’s needs of convenient travel, more and more underground railway stations will be built. However, when a high-speed train runs across a complex underground station, it will cause a series of aerodynamic problems, which will endanger passengers’ safety and comfort. Therefore, some deeper and comprehensive researches for high-speed railway underground stations’aerodynamic effects and the corresponding mitigation measures should be done.In this thesis, the research is based on the preliminary designed drawings of Badaling Underground Railway Station and the knowledge of aerodynamics and computational fluid dynamics. The thesis explores some rules of aerodynamics effects in Badaling Underground Railway Station while high-speed trains run across this station with different ways, which use some emulational models of this station. The main work and conclusions are as follows:1. In this thesis, the laws of aerodynamics effects when high-speed trains run across Badaling underground railway station without setting shaft and PSD system has been explored. The results show that two high-speed trains meet in the center of the station is the worst case to aerodynamics effects of the station, in this case, the maximum transient pressure at the platform is 0.58kPa/1.7s which exceeds the standard maximum value 0.41kPa/1.7s, and the maximum wind speed is 3.49m/s which measures up the standard maximum value 5m/s proposing by Metro Design Specification.2. In this thesis, the PSD systems’ aerodynamic effects on Badaling Underground Railway Station has been explored. The results show that the maximum transient pressure at the platform is 0.4kPa/1.7s which measures up the standard maximum value, but the aerodynamic effects become worse when the PSD systems are installed at the platform; when two high-speed trains meet in the center of the station, the maximum pressure on PSD is about 937Pa while high-speed trains run across the station and the maximum wind speed at PSD doors is about 9.88m/s which exceeds the standard maximum value 5m/s proposing by Metro Design Specification.3. In this thesis, the shafts’ aerodynamic effects on Badaling Underground Railway Station has been explored, and the optimal location and opening ratio of the shaft has been confirmed. The results show that the best location is the intersection of bell mouth and the interval tunnel and the best opening ratio is between 25% and 30%. Setting the shaft in the best location with the best opening ratio can decrease crest value of compression wave 31.36%, the maximum transient pressure 31.03% and the maximum wind speed 42.69%.4. In this thesis, the rock mid-walls’ aerodynamic effects on Badaling Underground Railway Station has been explored. The results show that rock mid-walls will decrease the aerodynamic effects on the platform of the station significantly, especially the wind speed on the platform, which beyond 100%. But the rock mid-walls will make the aerodynamic effects worse at fast-pass line and fast-pass train.