• Journal of Korean Tunnelling and Underground Space Association
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• v.2 no.3
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• pp.3-11
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• 2000

Purpose of this paper is to investigate the hood configuration at a tunnel entrance to reduce the micro pressure wave that is generated according to train speed. Two configurations were examined for the tunnel of 0.5 km in length. The experimental results show that a slit cover hood installed at the entrance of the tunnel reduces the maximum micro pressure wave by 41.2%, and the configuration with a slit cover hood installed at the entrance and the $45^{\circ}$ slanted portal at the exit of the tunnel suppress the pressure wave by 47.7%.

• Proceedings of the KSME Conference
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• 2000.04b
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• pp.619-624
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• 2000

The purpose of present study is to investigate for reducing micro pressure waves generated according to train speeds $(240km/h{\sim}380km/h)$ through tunnels with countermeasures as followings; the hood configuration in tunnel entrance. We developed hoods for tunnel of 0.5 km length in the condition of tunnel cross-section area of $107m^2$ on the slab track. According to the results the maximum micro-pressure wave is reduced by 41.2% for the slit hood installed at the entrance of the tunnel and reduced by 47.7% for the slit hood installed at the entrance of the tunnel and the $45^{\circ}$ slanted portal at the exit of the tunnel