Effect of underground tunnel on the ground surface acceleration |
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| Affiliation: | 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 and Environmental Engineering, Korean Advanced Institute of Science & Technology, Daejeon 305-701, Republic of Korea;1. Institute of Mineral Resources Engineering, National Taipei University of Technology, Taipei, Taiwan;2. Department of Civil Engineering, National Taiwan University, Taipei, Taiwan;3. Department of Geotechnical Engineering, CECI Engineering Consultants, Inc., Taipei, Taiwan;1. Department of Civil and Environmental Engineering, Geotechnical Research Center, The University of Western Ontario, 1151 Richmond Street, London, Ontario, Canada N6A 5B9;2. Department of Civil Engineering, University of Benghazi, Benghazi, Libya;1. Department of Civil Engineering, Zanjan Branch, Islamic Azad University, Zanjan, Iran;2. Geotechnical Engineering Research Center, International Institute of Earthquake Engineering and Seismology (IIEES), No. 26, Arghavan Street, North Dibajee, Farmanieh, Tehran, Iran;3. Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran;1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;2. Department of Civil, Architectural and Environmental Engineering, University of Naples Federico II, Naples 80125, Italy;3. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;4. Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Tongji University, Shanghai 200092, China;1. Department of Geotechnical Engineering, Tongji University, Shanghai, PR China;2. Institute for Geotechnical Engineering, ETH Zürich, Switzerland;3. Shanghai Shentong Metro Co., Ltd., Shanghai, PR China |
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| Abstract: | A series of dynamic centrifuge tests was designed and conducted to study the seismic behavior of buried box tunnels. In this study, numerical simulations of the same tests were also performed using a finite difference software. The simulation results were in very good agreement with the results observed in the centrifuge tests. Subsequently, verified numerical model was used to perform parametric studies on the effect of an underground box tunnel on the ground surface acceleration. The results of parametric studies revealed that an underground tunnel could have either positive or negative effect on the ground surface acceleration. Presence of the tunnel amplifies long periods and deamplifies short periods of the motion. Therefore, it is concluded that the effect of an underground structure on the acceleration at the ground surface may be significant and hence, should be taken into account for seismic zonation of urban areas. |
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| Keywords: | Centrifuge modeling Underground structure Numerical simulation Acceleration Ground surface |
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