Effects of middle air shaft and bypass duct on aerodynamic pressure of platform screen doors in the high-speed subway stations

Abstract

The aerodynamic pressure disturbances induced by middle air shafts and bypass ducts in subway tunnels pose significant challenges to enhancing train operational speeds. A comprehensive series of full-scale experiments are employed to examine the impact of these structural elements on the aerodynamic pressure characteristics of platform screen doors (PSD) in high-speed subway stations. The experimental results reveal that peak pressures manifest on PSD surfaces during two distinct scenarios in high-speed subway systems equipped with middle air shafts. One is compression pressure waves propagated from trains traversing the air shaft, and the other is train nearby flow when trains pass the PSD directly. The peak positive pressures caused by train passing PSD is much greater than compression pressure waves. Closing middle air the shaft can reduce the passing pressure waves. The installation of bypass ducts at overtaking station entrances effectively mitigates peak negative pressures during train-PSD interactions, achieving a maximum reduction efficiency of 8%. These findings provide valuable insights for optimizing the structural design of high-speed subway tunnel systems.

Keywords

subway station / platform screen door / aerodynamic pressure measurement / middle air shaft / bypass duct

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