Abstract: Utilizing the slip grid technique, finite volume method theory, the unsteady viscous compressible Navier-Stokes(N-S) equation, and RNG turbulence equation, a refined fluid-solid coupling numerical calculation model for tunnel structure-train interaction is established. This model examines the temporal and spatial characteristics of aerodynamic pressure on tunnel lining structures, and the variation patterns of aerodynamic effects under various conditions. Additionally, the validity of the numerical calculation is confirmed through dynamic model testing. The findings are as follows: (1) The pressure and flow field cloud images vividly depict the propagation process and characteristics of aerodynamic pressure waves. (2) The existing empirical formula for the maximum compression wave is revised based on train length, proposing a train friction coefficient of 2.255 Pa/m. (3) The relationship between the attenuation rate of peaktopeak pressure under different tunnel lining structures and the number of cycle periods is established, providing a theoretical basis for subsequent analysis of fatigue damage to the lining structures under aerodynamic load. (4) The peak of aerodynamic pressure on the segment structure decreases more rapidly after the train tail exits the tunnel or in a long tunnel compared to a mold-lined tunnel. Furthermore, the amplitude of the micro-pressure wave at 20 m and 50 m outside the exit of the shield tunnel decreases by approximately 1.53% to 5.5% compared with that in the mold-lined tunnel.

Key words:  high-speed train, mold-lined tunnel, shield tunnel, numerical simulation, peak aerodynamic pressure, micro-pressure wave