A numerical study of the evolution of the blast wave shape in rectangular tunnels |
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| Affiliation: | 1. Univ Lille Nord de France, F-59000 Lille, France;2. UVHC, LAMIH, F-59313 Valenciennes, France;1. Nanjing Tech University, College of Safety Science and Engineering, China;2. Jiangsu Key Laboratory of Urban and Industrial Safety, College of Safety Science and Engineering, Nanjing Tech University, Nanjing 210009, China;1. Department of Mining, Faculty of Engineering, Urmia University, Urmia, Iran;2. Department of Mining, Faculty of Engineering, Islamic Azad University, Science and Research Branch of Tehran, Iran;3. Department of Civil Engineering, Grenoble Alps University, Laboratory 3SR, Polytech Grenoble, France;4. Geotechnical Expert, Antea Group, Antony, France;5. Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam;1. Hubei Key Laboratory of Construction and Management in Hydropower Engineering, China Three Gorges University, Yichang, 443002, China;2. Research Center of Highway Large Structure Engineering on Safety, Ministry of Education, Chang''an University, Xi''an, 710064, China;3. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, 430072, China;4. Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang, 212013, China |
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| Abstract: | When the explosion of condensed materials occurs in square or circular cross-section tunnel, the subsequent blast wave reveals two patterns: three-dimensional close to the explosive charge and one-dimensional far from the explosion. Pressure decays for these two patterns have been thoroughly studied. However, when the explosion occurs in rectangular cross-section tunnel, which is the most regular geometry for underground networks, the blast wave exhibits a third, two-dimensional, patterns. In order to assess the range of these three patterns, several numerical simulation of blast waves were carried out varying the width and the height of the rectangular cross-section as well as the mass of the charge. Laws are presented to localize the transition zones between the 3D and the 2D patterns, and between the 2D and the 1D patterns, as functions of non-dimensional width and height. The numerical results of the overpressure are compared to existing 3D and 1D laws. An overpressure decay law is proposed to represent the 2D pattern. Knowing the two transition zones and the overpressure decays within these zones, an algorithm is presented to efficiently predict an overpressure map. This algorithm is validated by comparison with experimental data. |
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| Keywords: | Damage assessment for explosions Three-dimensional simulation Blast wave Confined domain Adaptive grid |
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