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http://dx.doi.org/10.17664/ksghe.2021.17.4.079

Blast Overpressure Evaluation for Blast Valves in Protective Tunnels with Rectangular-Shaped Tunnel Entrances  

Pang, Seungki (Department of Architecture, kyungmin University)
Shin, Jinwon (Department of Architectural Engineering, Catholic Kwandong University)
Publication Information
Journal of the Korean Society for Geothermal and Hydrothermal Energy / v.17, no.4, 2021 , pp. 79-90 More about this Journal
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
Protective tunnel; Blast valve; Blast overpressure; tunnel entrance; Blast pocket; Numerical modeling;
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