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Experimental evaluation of vulnerability for urban segmental tunnels subjected to normal surface faulting
Institution:1. Department of Civil Engineering, University of Tabriz, 29 Bahman Sq., Azadi Ave., Tabriz, Iran;2. School of Civil Engineering, University College of Engineering, University of Tehran, Engelab Ave, Tehran, Iran;3. International Institute of Earthquake Engineering and Seismology (IIEES), No. 21, Arghavan St., North Dibaji St., Farmanyeh, Tehran, Iran;1. Center of Excellence for Fundamental Studies in Structural Engineering, School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran;2. School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran;3. Department of Civil Engineering, National Central University, Chungli, Taoyuan, Taiwan;4. Department of Civil Engineering, National Central University, Chungli, Taoyuan, Taiwan;1. Department of Geotechnical Engineering, Faculty of Civil Engineering, University of Tabriz, 29 Bahman Blvd, Tabriz, Iran;2. Department of Geotechnical Engineering, Faculty of Civil Engineering, University of Tabriz, 29 Bahman Blvd, Tabriz, Iran;3. Antea Group, Antony, France;4. Grenoble Alpes University, Laboratory 3SR, Grenoble, France;5. Department of Environmental, Land and Infrastructure Engineering, Politecnico di Torino, Corso Duca degli Abruzzi, Torino 24-10129, Italy;1. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu, China;2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, China;3. College of Environment and Civil Engineering, Chengdu University of Technology, Chengdu, China;4. National Engineering Laboratory for Technology of Geological Disaster Prevention in Land Transportation, Southwest Jiaotong University, Chengdu, China;1. College of Surveying and Geo-Informatics, Tongji University, Shanghai 200092, China;2. College of Civil Engineering, Tongji University, Shanghai 200092, China;3. Shanghai Tong Yan Civil Engineering Ltd., Shanghai 200092, China;4. Chongqing Construction Science Research Institute, Chongqing 400015, China
Abstract:Faulting is one type of permanent ground displacement (PGD); tunnels are at the risk of damage when they are susceptible to faulting. The present study proposes an experimental approach to create the fragility curves for shallow segmental tunnels in alluvial deposits subjected to normal surface faulting. Centrifuge testing was carried out in order to achieve this purpose. The proposed approach allows evaluation of new fragility curves considering the distinctive features of tunnel geometry and fault specifications. The comparison between the new fragility curves and the existing empirical curves was discussed as well. Compared to tunnels in rock, tunnels in alluvial deposits are more susceptible to failure because of different mechanisms of collapse into tunnel at large exerted PGD.
Keywords:Shallow segmental tunnel  Experimental fragility curves  Normal surface faulting  Centrifuge  Physical modeling
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