Seismic response of shallow circular tunnels in two-layered ground |
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| Institution: | 1. Faculty of Civil Engineering, University of Tabriz, Iran;2. Faculty of Engineering, Azarbaijan Shahid Madani University, Iran;3. Department of Mining Engineering, Sahand University of Technology, Tabriz, Iran;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 Engineering, Indian Institute of Technology, Roorkee 247667, India;2. Department of Civil Engineering, Indian Institute of Science, Bangalore 560012, India;1. Hanoi University of Mining and Geology, Faculty of Civil Engineering, Department of Underground and Mining Construction, Hanoi, Vietnam;2. Grenoble Alpes University, Laboratory 3SR, 38401 Grenoble Cedex 9, France;3. Politecnico of Torino, Department of Environmental, Land and Infrastructural Engineering, Torino, Italy;4. University of Lyon, INSA of Lyon, Laboratory LGCIE, Villeurbanne, France;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 |
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| Abstract: | The effect of ground stratification on the seismic response of circular tunnels is investigated, as most practice-oriented studies consider homogeneous ground. A finite element plain-strain model of a circular tunnel cross-section embedded in a two-layered ground is used to highlight the influence of stratification on the tunnel?s seismic response. The layers interface was placed at the crown, centre and invert level.It is proved that ground stratification has an important role in the lining seismic forces. When the tunnel is fully embedded in one of the layers, the seismic lining forces may vary significantly in comparison with the single-layer case. If the tunnel intercepts both layers, maximum lining forces aggravation occurs when the lower layer is very stiff. |
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| Keywords: | Tunnels Soil–lining interaction Ovaling deformation Seismic design of tunnels Layered ground |
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