고속열차 진입속도가 터널 미기압파에 미치는 영향
Effect of the entry speed of high-speed train on tunnel micro-pressure wave
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초록
고속열차가 터널 입구에 돌입 시, 충격성 소음을 수반한 미기압파는 반대쪽 터널 출구에서 발생한다. 이 간헐적인 미기압파는 터널 출구 주변 민가에 새로운 소음 공해의 원인이 되었다. 이러한 공학적인 문제를 해결하기 위하여 고속열차를 도입하는 대부분의 국가에서는 터널 내부에서 발생하는 압축파를 제어하여 미기압파의 크기를 줄이려고 시도하고 있다. 본 연구에서는 터널 출구 지형이 교량인 경우에 대하여, 열차 속도가 증가할 때 터널 출구에서 방출되는 미기압파의 3차원 방사 패턴을 조사하기 위하여 수치해석을 수행하였다. 이러한 연구는 심각한 환경문제를 겪고 있는 터널 출구 주변 민가의 방음대책 마련을 위한 기초 데이터를 제공한다.
Abstract
As the high-speed train enters the tunnel, an impulse wave with impulsive noise is generated at the tunnel exit on the opposite side. This intermittent impulse wave caused new noise pollution in the villages around the tunnel exit. In order to solve this engineering problem, most of the countries around the world that have adopted high-speed trains are trying to reduce the magnitude of impulse waves by controlling the compression waves generated inside tunnel. In this study, numerical analysis was carried out to investigate the three-dimensional radiation pattern of impulse waves emitted from the tunnel exit when the train speed increases in a given topography condition at the tunnel exit. This study provides basic data for the soundproofing measures of the villages around the tunnel exit.
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