Impulsive pressure waves (micro-pressure waves) emitted from tunnel portals are one of the environmental problems affecting high-speed railways. The magnitude of the micro-pressure waves emitted from long ballast track tunnels decreases more than those emitted from long slab track tunnels due to the distortion of compression waves propagating through tunnels. This study investigated the effect of adding ballast to slab-track in tunnels on reducing micro-pressure waves by conducting four series of field measurements and numerical analyses. The results indicate that the addition of ballast to slab-track in tunnels is an effective measure for reducing micro-pressure waves as running speeds are increased on high-speed railways.
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