Journal of the Korean Society for Geothermal and Hydrothermal Energy (한국지열·수열에너지학회논문집)

Korean Society for Geothermal and Hydrothermal Energy (한국지열·수열에너지학회)
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Blast Overpressure Evaluation for Blast Valves in Protective Tunnels with Rectangular-Shaped Tunnel Entrances

각형 출입구를 갖는 방호터널의 방폭밸브에 미치는 폭압 평가

  • Pang, Seungki (Department of Architecture, kyungmin University) ;
  • Shin, Jinwon (Department of Architectural Engineering, Catholic Kwandong University)
  • 방승기 (경민대학교 건축과) ;
  • 신진원 (가톨릭관동대학교 건축공학과)
  • Received : 2021.11.14
  • Accepted : 2021.11.26
  • Published : 2021.12.01
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Abstract

This paper presents a study to reduce the effect of blast pressure on the blast valves installed in protection tunnels, where the shape of the tunnel entrance and the blast pocket is optimized based on the predetermined basic shape of the protective tunnels. The reliability of the numerical tunnel models was examined by performing analyses of mesh convergence and overpressure stability and with comparison to the data in blast-load design charts in UFC 3-340-02 (DoD, 2008). An optimal mesh size and a stabilized distance of overpressure were proposed, and the numerical results were validated based on the UFC data. A parametric study to reduce the blast overpressures in tunnel was conducted using the validated numerical model. Analysis was performed applying 1) the entrance slope of 90, 75, 60, and 45 degrees, 2) two blast pockets with the depth 0.5, 1.0, and 1.5 times the tunnel width, 3) the three types of curved back walls of the blast pockets, and 4) two types of the upper and lower surfaces of the blast pockets to the reference tunnel model. An optimal solution by combining the analysis results of the tunnel entrance shape, the depth of the blast pockets, and the upper and lower parts of the blast pockets was provided in comparison to the reference tunnel model. The blast overpressures using the proposed tunnel shape have been reduced effectively.

Keywords

Acknowledgement

본 연구는 국토교통부 국토교통기술촉진연구사업의 연구비 지원으로 수행되었습니다(과제번호 21CTAP-C163526-01).

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