Countermeasure for Reducing Micro-pressure Wave Emitted from Railway Tunnel by Installing Hood at the Exit of Tunnel

Abstract

Micro-pressure waves radiated from tunnel exit portals are one of major wayside environmental problems in high-speed railways, and have thus prompted many studies aimed at developing countermeasures to this phenomenon. This paper proposes a new method involving the addition of a hood to tunnel exit portals to reduce micro-pressure waves. An inside partition divides the inside of the hood in two in the vicinity of the mouth, and one of the partitioned sides is closed off. Confirmation was obtained that the hood is effective in reducing the magnitude of micro-pressure waves.