Numerical modeling of changes in anisotropy during liquefaction using a generalized constitutive model |
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| Institution: | 1. Department of Geotechnical Engineering, Tongji University, Siping Road 1239, Shanghai 200092, China;2. Centre for Marine Geotechnical Engineering, Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 20030, China;3. Department of Civil Engineering, Nagoya Institute of Technology, Showa-ku, Gokiso-cho, Nagoya 466-8555, Japan;1. Department of Civil and Environmental Engineering, Universiti Teknologi PETRONAS, Bandar Seri Iskandar 32610, Malaysia;2. School of Mechanical Engineering, Hanyang University, Seoul 04763, Republic of Korea;3. Civil Engineering Department, Universitas Islam Indonesia, Yogyakarta 55584, Indonesia;1. Department of Civil Engineering, The University of British Columbia, Vancouver, BC, Canada;2. Department of Civil, Construction, Architectural, and Environmental Engineering, University of L''Aquila, L''Aquila, Italy;3. Department of Civil and Environmental Engineering, University of California at Davis, Davis, CA, USA;4. Center for Geotechnical Modeling, University of California at Davis, Davis, CA, USA;1. School of Civil Engineering, State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing, China;2. School of Civil Engineering, State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China;3. Ertan Hydropower Development Company Limited, Chengdu 610051, China;1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu 610059, China;3. Department of Civil Engineering, Shenzhen University, Shenzhen 518060, China;4. College of Surveying and Geo-informatics, Tongji University, Shanghai 200092, China |
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| Abstract: | A constitutive model with rotation hardening was generalized from the triaxial compression state to a general stress state. With the generalized model, numerical simulations of cyclic and monotonic undrained triaxial tests were conducted to reproduce the phenomenon of continuous, orderly and rapid changes in anisotropy during liquefaction. The simulated results demonstrated that when sand enters the liquefaction stage, the yield surface in the stress space rotates quickly, causing continuous and rapid changes in anisotropy. Through comparison of the simulated and experimental results, the generalized constitutive model was shown to be able to capture the fundamental behaviors of sand demonstrated by the experimental data, and the rotational hardening rule adopted in the generalized model was proven suitable for describing the continuous, orderly and rapid changes in anisotropy that occur during liquefaction. |
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