Liquefaction-induced deformation of earthen embankments on non-homogeneous soil deposits under sequential ground motions |
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| Institution: | 1. Department of Civil Engineering, National Chung Hsing University, Taiwan;2. URS Corporation, 1333 Broadway, Suite 800, Oakland, CA 94612, USA;1. RIKEN Advanced Institute for Computational Science, 7-1-26, Minatojima-minami-machi, Kobe, Hyogo 6500047, Japan;2. Earthquake Research Institute, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 1130032, Japan;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 Civil and Environmental Engineering, University of California Davis, Davis, CA, USA;2. Department of Civil and Environmental Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA;3. Department of Engineering, Cambridge University, UK;4. Department of Civil Engineering, National Central University, Jhongli City, Taoyuan, Taiwan;5. Disaster Prevention Research Institute, Kyoto University, Kyoto, Japan;6. Department of Civil Engineering, Zhejiang University, Hangzhou, PR China;7. Department of Civil and Environmental Engineering, George Washington University, Washington, D.C., USA;1. Department of Civil and Environmental Engineering, University of California, Davis, CA, USA;2. Department of Civil Engineering, Auburn University, Auburn, AL, USA |
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| Abstract: | Damage of embankments during earthquakes is widely attributed to the liquefaction of foundation soil. Previous studies have investigated the dynamic response of embankments by mainly considering uniform sand foundation and a single earthquake event. However, the foundation of an embankment consists of many sublayers of soil from liquefiable sand to relatively impermeable layer, and during earthquakes a mainshock may trigger numerous aftershocks within a short time which may have the potential to cause additional damage to soil structures. Accordingly, the investigation of liquefaction-induced deformation of earthen embankments on various liquefiable foundation conditions under mainshock–aftershock sequential ground motions is carried out by a series of dynamic centrifuge tests in this study. The liquefiable foundation includes uniform sand profile, continuous layered soil profile, and non-homogeneous soil profiles. Effects of various foundation conditions on embankment deformations are compared and analyzed. From the test results, it is found that the embankment resting on non-homogeneous soil deposits suffer more damage compared to the uniform sand foundation of same relative density. The test results also suggest that the sequential ground motions have a significant effect on the accumulated deformation of embankment. |
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| Keywords: | Liquefaction Embankment Deformation Non-homogeneous foundation Centrifuge model test Excess pore water pressure |
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