New Evaluation Method for Liquefaction of Ground Using Dynamic Liquefaction Analysis Method and Its Application
This article has been corrected.
VIEW CORRECTIONPublication: International Journal of Geomechanics
Volume 16, Issue 5
Abstract
Nankai megathrust earthquakes are expected to occur with a return period of approximately 90–200 years along the fault of the Nankai Trough. Because they are interplate earthquakes, it is predicted that they will cause heavy liquefaction damage as a result of the long duration of their ground motion, especially around bay areas with soft deposits. In this study, a numerical analysis was performed for the ground in Osaka City with a hypothetical earthquake in the Nankai Trough region. In the numerical simulation of the dynamic behavior, a liquefaction analysis program was used. To quantify the degree of liquefaction at certain points, an index, named the liquefaction risk index (LRI), was defined and obtained by the weighted integration of the effective stress-decreasing ratio (ESDR) with respect to depth. Moreover, the LRI values were evaluated by data from the 1995 Hyogoken-Nanbu earthquake. It was found that the obtained LRI values were greater than 6.0 for the points at which heavy liquefaction damage had occurred. From the numerical results, the risk of liquefaction was evaluated with these LRI values.
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Acknowledgments
This study used the hypothetical earthquake in the Nankai Trough region by M. Sugito of Gifu University. The boring test results released by the Kansai Geoinformatics Network were applied. This work was supported by Japanese Society for the Promotion of Science, Grants-in-aid for scientific research 24221010 (representative Y. Kawata of Kansai University).
Figs. 8 and 9 were made by one of the authors, H. Yui, using the designated regional data (2012) and hydrology data (2012) of National Land Numerical Information provided by the Ministry of Land, Infrastructure, Transport and Tourism in Japan. The authors followed the terms of use before using these services (http://nlftp.mlit.go.jp/ksj-e/index.html). The authors thank the reviewers for their valuable comments and are grateful for all their support.
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© 2016 American Society of Civil Engineers.
History
Received: Nov 20, 2014
Accepted: Jun 16, 2015
Published online: Jan 28, 2016
Discussion open until: Jun 28, 2016
Published in print: Oct 1, 2016
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