Journal of Korean Association for Spatial Structures (한국공간구조학회논문집)

Korean Association for Spatial Structures (한국공간구조학회)
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CFD-Based Overpressure Evaluation Inside Expansion Chamber-Applied Protective Tunnels Subjected to Detonation of High Explosives

확장챔버를 적용한 방호터널 내부의 CFD 해석 기반 폭발압력 평가

  • Shin, Jinwon (Dept. of Architectural Engineering Catholic Kwandong University) ;
  • Pang, Seungki (Dept. of Architecture, Kyungmin University)
  • 신진원 (가톨릭관동대학교 건축공학과 ) ;
  • 방승기 (경민대학교 건축과 )
  • Received : 2022.12.27
  • Accepted : 2023.02.17
  • Published : 2023.03.15
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Abstract

This paper presents a computational fluid dynamics (CFD) analysis to investiagate the effect of expansion chamber on overpressure reduction in protective tunnels subjected to detonation of high explosives. A commercial CFD code, Viper::Blast, was used to model the blast waves in a protective tunnel with a length of 160 m, width of 8.9 m and height of 7.2 m. Blast scenarios and simulation matrix were establihsed in consideration of the design parameters of expansion chamber, including the chamber lengths of 6.1 m to 12.1 m, widths of 10.7 m to 97 m, length to width ratios of 0.0 to 5.0, heights of 8.0 m and 14.9 m, and ratios of chamber to tunnel width of 1.2 to 10.9 m. A charge weight of TNT of 1000 kg was used. The mesh sizes of the numerical model of the protective tunnel were determined based on a mesh convergence study. A parametric study based on the simulation matrix was performed using the proposed CFD tunnel model and the optimized shape of expansion chamber of the considered tunnel was then proposed based on the numerical results. Design recommendations for the use of expansion chamber in protective tunnel under blast loads to reduce the internal overpressures were finally provided.

Keywords

Acknowledgement

본 연구는 국토교통부 국토교통기술촉진연구사업의 연구비 지원으로 수행되었습니다. (과제번호 22CTAP-C163528-02).

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