Analysis of circular tunnels due to seismic P-wave propagation,with emphasis on unreinforced concrete liners |
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| Institution: | 1. ARC Centre of Excellence for Geotechnical Science and Engineering, Faculty of Engineering and Built Environment, The University of Newcastle, Callaghan, NSW 2308, Australia;2. School of Science and Technology, Hellenic Open University, Parodos Aristotelous 18, GR 26335 Patra, Greece;1. Department of Engineering Mechanics, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;2. Hebei Key Laboratory of Intelligent Materials and Structures Mechanics, Shijiazhuang 050043, China;3. State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang 050043, China;4. School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;5. College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 21106, China;1. State Key Laboratory of Precision Blasting, Jianghan University, Wuhan 430056, China;2. Hubei Key Laboratory of Blasting Engineering, Jianghan University, Wuhan 430056, China;3. Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana 61801, Illinois, USA;4. School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China |
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| Abstract: | A set of closed-form expressions to calculate tunnel liner forces due to compressional seismic P-wave propagation is presented. The results are compared against a state-of-practice method that considers only shear S-waves, and verified against dynamic numerical analyses. Under the realistic assumption of full-slip conditions at the liner-rock mass interface, it is shown that P-waves can lead to significantly higher axial hoop forces compared to S-waves, and can be critical for tunnels bored through areas of irregular topography/geological stratigraphy. The findings are of particular interest for the analysis of unreinforced concrete tunnel liners, where earthquake effects can be a governing factor. |
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| Keywords: | Earthquakes Tunnels Unreinforced concrete P-waves |
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