2001 Field test on the effective window pattern for an entrance hood installed at the portal of a long slab-track tunnel

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  • 2001 長大スラブ軌道トンネルに適した緩衝工開口部の現地試験(S23-1 トンネルの空気力学,換気,火災(1),21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

Abstract

A micro-pressure wave depends on the pressure gradient of the compression wave at the tunnel exit. We measured and investigated the distortion processes of the compression waves during propagation in a Shinkansen long slab-track tunnel. The results confirm that the degree of steepening of the compression wave depends on not only the pressure gradient but also the waveform itself. For this reason, the optimum initial waveform of the compression wave at the tunnel entrance, which is produced by the effective window pattern of a tunnel entrance hood, should be determined considering the distortion process of the compression wave.

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