Abstract:

To explore the stability of operating trains when using inclined shafts to extract air from the adjacent highspeed railway tunnel, a case study is conducted on a singletrack tunnel with a speed of 350 km/h. Furthermore, the aerodynamic coefficients of trains under three operating conditions: inclined shaft screen door closed, screen door open without air extraction, and screen door open with air extraction, and their variation characteristics are numerically simulated and analyzed. Finally, the overturning stability of the trains is discussed according to relevant standards. The research results show the following: (1) The operating condition of screen door open with air extraction greatly affect the overturning stability of the trains, that of screen door open without air extraction slightly affect the overturning stability of the trains, and that of screen door closed does not affect the overturning stability of the trains. (2) Air extraction from inclined shaft increases the pressure difference between the left and right sides of the train, which raises the risk of train overturning, but reduces the pressure difference between the top and bottom surfaces, thus reduces the vertical vibration of the train. (3) According to the coefficient of overturning calculated by the specification, when the screen door of the inclined shaft is opened with air extraction, the train will not overturn.

Key words:  , high-speed railway tunnel, air extraction from inclined shaft, overturning stability, numerical simulation