列車のトンネル突入時に形成される圧縮波の三次元・軸対称列車模型を用いた実験

概要

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An impulsive pressure wave (micro-pressure wave) emitted from a tunnel portal is one of the environmental problems in high-speed railways. The magnitude of the micro-pressure wave is approximately proportional to the maximum pressure gradient of the compression wavefront at the tunnel portal. Consequently, it is necessary to investigate the compression wave generated when a train enters a tunnel for estimating and reducing the micro-pressure wave. In this study, the generation of the compression wave by a train entering a tunnel is investigated by model experiments. The train, tunnel and ground are represented by a three-dimensional model with a ground plate, a mirror-imaged three-dimensional model and an axisymmetric model. The experimental results indicate that the distance between the train center and the center of the tunnel base is a significant parameter for the estimation of the compression wave in the tunnel generated by the train entry. Furthermore, the model experiments with three-dimensional model can improve the accuracy of the estimation of the compression wave even if the train nose is equipped with parts having sharp edges like a snowplow.