{"id":9672,"date":"2026-08-05T21:49:03","date_gmt":"2026-08-05T13:49:03","guid":{"rendered":"\/jase\/?post_type=tkuisotope&p=9672"},"modified":"2026-08-06T22:53:54","modified_gmt":"2026-08-06T14:53:54","slug":"jase-202611-34-002","status":"publish","type":"tkuisotope","link":"\/jase\/?tkuisotope=jase-202611-34-002","title":{"rendered":"Chamber and Orifice-Plate Attenuators for Rectangular Tunnel Blast Pressure"},"content":{"rendered":"\n
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<\/i> 2026<\/a><\/p>\n<\/div>\n\n\n\n

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<\/i> Volume 34<\/a><\/p>\n<\/div>\n\n\n\n

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Cheng-Wei Hung1<\/sup> and Pen-Chou Chen2<\/sup><\/i><\/a><\/p>\n\n\n\n

1<\/sup>Department of Civil Engineering and Environmental Informatics, Minghsin University of Science and Technology, Hsinchu 30401, Taiwan<\/p>\n\n\n\n

2<\/sup>Department of Civil Engineering, National Chung Hsing University, Taichung 40227, Taiwan<\/p>\n<\/div>\n\n\n\n

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Received: May 06, 2025
Accepted: June 19, 2026
Publication Date: August 05, 2026<\/p>\n<\/div>\n<\/div>\n\n\n\n

\"\u4e0a\u50b3\u5716\u7247\"\n\n\n

SHAP summary plot for the best-performing model. <\/p>\n<\/div>\n<\/div>\n\n\n\n

<\/i> Copyright <\/strong>The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0)<\/a>, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.<\/p>\n\n\n\n

Download Citation:\u00a0 BibTeX <\/a>| http:\/\/dx.doi.org\/10.6180\/jase.202611_34.002<\/a>\u00a0\u00a0<\/p>\n\n\n\n

Download PDF<\/a><\/p>\n\n\n\n

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External explosions near tunnel entrances can transmit severe shock waves into rectangular underground passages. This study experimentally compares three compact internal blast-pressure reduction configurations: an expansion chamber, a single-orifice plate, and a double-orifice plate. Scaled C4 explosive tests were conducted using 100-350g charges located 60 cm from the tunnel entrance and aligned with the tunnel centreline. A
rectangular steel tunnel model with a 30 cm \u00d7 30 cm internal cross-section and a total length of 200 cm was instrumented at L\/D = 0.07, 1.00, 3.00, and 5.67. The main attenuation index was the downstream-to-upstream peak-pressure ratio between L\/D = 3.00 and L\/D = 5.67. Across the five charge masses, the expansion chamber, single-orifice plate, and double-orifice plate produced mean experimental pressure reductions of 29.9 \u00b19.9%,51.2 \u00b16.1%, and 81.9\u00b13.8%, respectively. The double-orifice configuration provided the strongest attenuation because it introduced two sequential restriction and diffraction stages. For the expansion chamber, the downstream pressure represents an intra-chamber measurement and should not be interpreted as a post chamber transmission coefficient. The numerical observations are retained only as supplementary qualitative interpretation; the experimental results form the quantitative basis of the conclusions. The findings provide a bounded experimental ranking of compact geometric attenuation devices for rectangular tunnel blast mitigation, rather than a general design standard.<\/p>\n\n\n\n

Keywords: confined blast; pressure reduction; scaled explosive testing; geometric restriction; shock-wave diffraction; protective design<\/em><\/p>\n\n\n\n

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