An elasto-viscoplastic model for soft rock around tunnels considering overconsolidation and structure effects |
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| Institution: | 1. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Siping Road 1239, Shanghai 200092, China;2. Department of Civil Engineering, Nagoya Institute of Technology, Showa-ku, Gokiso-cho, Nagoya 4668555, Japan;1. McGovern Institute for Brain Research, Massachusetts Institute of Technology, Cambridge;2. Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge;3. Department of Anatomy and Neurobiology, Boston University School of Medicine, Boston, Massachusetts;4. Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal;5. Faculty of Medicine, University of Coimbra, Coimbra, Portugal;1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;2. Department of Civil and Architectural Engineering and Mechanics, The University of Arizona, Tucson, AZ 85721, USA;3. Department of Civil Engineering, Shanghai University, Shanghai 200444, China;1. Institut für Geotechnik, Universität für Bodenkultur Wien, Feistmantelstrasse 4, A-1180 Vienna, Austria;2. Department of Civil and Environmental Engineering, Nazarbayev University, Qabanbay Batyr Ave 53, Nur-Sultan 010000, Kazakhstan;1. Departamento de Geología, Universidad de Salamanca, 37008 Salamanca, Spain;2. Instituto Geológico y Minero de España, 28003 Madrid, Spain;1. Technion – Israel Institute of Technology, Haifa, Israel;2. Technical University of Denmark, Lyngby, Denmark |
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| Abstract: | When evaluating the long-term stability of existing tunnels, the creep behavior of soft rock around the tunnel should be properly considered. It is also important to understand the failure mechanism of soft rock when designing the mitigation and remediation of the failure around a tunnel. In this paper, an elasto-viscoplastic model is first modified so that the overconsolidation effect and the structure effect of soft rock can be considered. Then, the performance of the modified model is confirmed with drained triaxial compression tests and creep tests on a manmade rock produced with gypsum and diatom clay. Based on the modified model, finite element analyses are conducted to simulate the model tests of an existing tunnel constructed within manmade rock. Two kinds of model tests are simulated: one is loading failure test and the other creep failure test. The good agreement between the numerical results and the test data validates the performance of the modified constitutive model and the applicability of the corresponding FEM for evaluating the creep failure behavior of an existed tunnel constructed in soft rock. |
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