Numerical assessment of liquefaction mitigation effects on residential houses: Case histories of the 2007 Niigata Chuetsu-offshore earthquake |
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| Institution: | 1. Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China;2. Department of Civil and Environment Engineering, Gunma University, Kiryu 376-8515, Japan;3. Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China;4. International Geotechnical Institute, Hunabashi 274-0081, Japan;1. College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing, 210098, China;2. Xiamen Ocean Vocational College, Xiamen, 361012, China;3. Key Laboratory of Ministry of Education for Coastal Disaster and Protection, Hohai University, Nanjing, 210098, China;4. Faculty of Engineering & Informatics, University of Bradford, Bradford, BD7 1DP, UK;1. GRI, Beaverton, OR, 97008, USA;2. Department of Civil and Environmental Engineering, Portland State University, Portland, OR, 97201, USA;3. New Albion Geotechnical, Inc., Reno, NV, 89509, USA;4. Jacobs, Corvallis, OR, 97330, USA;5. GRI, Beaverton, OR, 97008, USA;1. Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran;2. University of Tokyo, Tokyo, Japan;3. Department of Structural Engineering, Tanta University, Egypt;4. Department of Civil Engineering, Faculty of Engineering, Sohag University, Sohag, Egypt;5. Sumitomo Mitsui Construction, Co., Ltd., Tokyo, Japan;6. Department of Civil Engineering, Osaka City University, Osaka, Japan;1. Schofield Centre, University of Cambridge, CB3 0EL, UK;2. Department of Engineering, University of Cambridge, CB2 1PZ, UK |
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| Abstract: | In this study, the effectiveness of liquefaction countermeasures for residential houses was explored using a fully coupled dynamic effective-stress finite element procedure. Numerical analyses were conducted on two wooden houses that were damaged to different degrees due to dune liquefaction during the 2007 Niigata Chuetsu-offshore earthquake. House A, which was only improved by horizontal drainage pipes to lower the ground water level, was completely destroyed; however, house B, which was improved by a horizontal drainage system, soil–cement mixtures, and steel-pipe piles, was slightly deformed. Numerical results show that the effects of the sand dune slope on the damage to the two houses were somewhat different. For house B, it was found that the steel-pipe piles were more effective. Two countermeasures generally led to a greater degree of reduction in both lateral and vertical displacements of house B than only a single countermeasure employed. In addition, the combined implementation of steel-pipe piles and soil–cement mixtures was the most effective among the cases with two countermeasures. |
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| Keywords: | Finite element analysis Generalized plasticity model Dune liquefaction Liquefaction countermeasures Residential house Slope effect |
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