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Wind and Structures
  Volume 28, Number 4, April 2019 , pages 203-213

Aerodynamic effects of subgrade-tunnel transition on high-speed railway by wind tunnel tests
Jingyu Zhang, Mingjin Zhang, Yongle Li and Chen Fang

    The topography and geomorphology are complex and changeable in western China, so the railway transition section is common. To investigate the aerodynamic effect of the subgrade-tunnel transition section, including a cutting-tunnel transition section, an embankment-tunnel transition section and two typical scenarios for rail infrastructures, is selected as research objects. In this paper, models of standard cutting, embankment and CRH2 high-speed train with the scale of 1:20 were established in wind tunnel tests. The wind speed profiles above the railway and the aerodynamic forces of the vehicles at different positions along the railway were measured by using Cobra probe and dynamometric balance respectively. The test results show: The influence range of cutting-tunnel transition section is larger than that of the embankment-tunnel transition section, and the maximum impact height exceeds 320mm (corresponding to 6.4m in full scale). The wind speed profile at the railway junction is greatly affected by the tunnel. Under the condition of the double track, the side force coefficient on the leeward side is negative. For embankment-tunnel transition section, the lift force coefficient of the vehicle is positive which is unsafe for operation when the vehicle is at the railway line junction.
Key Words
    high-speed railway; embankment-tunnel transition section; cutting-tunnel transition section; wind tunnel test; vehicle aerodynamic coefficient; wind speed profile
Jingyu Zhang, Mingjin Zhang, Yongle Li and Chen Fang: Department of Bridge Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China

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