Abstract: Aerodynamic pressure significantly impacts the scientific evaluation of tunnel service performance. The aerodynamic pressure of two trains running in a double-track tunnel is considerably more complicated than that of a single train. We used the numerical method to investigate the difference in aerodynamic pressure between a single train and two trains running in a double-track tunnel. First, the numerical method was verified by comparing the results of numerical simulation and on-site monitoring. Then, the characteristics of aerodynamic pressure were studied. Finally, the influence of various train–tunnel factors on the characteristics of aerodynamic pressure was investigated. The results show that the aerodynamic pressure variation can be divided into stage I: irregular pressure fluctuations before the train tail leaves the tunnel exit, and stage II: periodic pressure declines after the train tail leaves the tunnel exit. In addition, the aerodynamic pressure simultaneously jumps positively or drops negatively for a single train or two trains running in double-track tunnel scenarios. The pressure amplitude in the two-train case is higher than that for a single train. The maximum positive peak pressure difference (P_STP) and maximum negative peak pressure difference (P_STN) increase as train speed rises to the power from 2.256 to 2.930 in stage I. The P_STP and P_STN first increase and then decrease with the increase of tunnel length in stage I. The P_STP and P_STN increase as the blockage ratio rises to the power from 2.032 to 2.798 in stages I and II.

Key words: Railway tunnel; Aerodynamic effect; Pressure characteristic; Train speed; Tunnel length; Blockage ratio

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