고속철도 장대터널에서 밸러스트 트랙 효과에 대한 수치적 연구

초록

This paper reports the numerical research of the relief effect of compression wave and micro wave between a high speed train and ballast ground track. When a high-speed train enters a narrow tunnel, a compression wave is generated ahead of the train. From the tunnel exit, some part of these wave is reflected back and other part of wave spouts to outside as a micro-wave. In the tunnel, compression wave has tendency of decreasing because of the viscosity from ballasted track. As a results, micro-wave also decreases. This ballast effect is not insignificant for a short tunnel. But it has an effect on pressure relief through the very long tunnel. To numerically analysis this effect, computational fluid dynamics is used on based of two-dimensional unsteady flow model and solving Navier-Stokes Equation using by Fluent software. The length of single track tunnel was 5km, 10km and compared with ballast ground track and slab ground track.