Centrifuge Modeling and Mitigation of Manhole Uplift due to Liquefaction
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 139, Issue 3
Abstract
Because low-compacted trench backfill around a manhole is normally liquefiable, the manhole could suffer uplift damage associated with soil liquefaction during a strong earthquake. In this study, 22 dynamic centrifuge models were tested to investigate the response of a buried manhole subjected to a dynamic load. The models were tested under 20g, and a substitute pore fluid was used to avoid the scaling law conflict between the dynamic and diffusion processes. It was found that excess pore water pressure is one of the contributing factors to the magnitude of the manhole uplift. Using this result, new mitigation methods against the uplift in liquefied ground were developed. Their effectiveness was also examined through the tests. A model manhole mitigated with the proposed methods was tested alongside regular model manhole. From the test results, the magnitude of manhole uplifts with the mitigation methods decreased as buildup of the excess pore water pressure was restrained in high-compacted backfill or excess pore water was dissipated into the manhole during strong shaking.
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Acknowledgments
This research was sponsored by the Institutional Program for Young Researcher Overseas Visit from the Global COE in the Disaster Prevention Research Institute of Kyoto University, Japan. The authors acknowledge the assistance of Dr. Yasuhiko Konishi and his staff at Nihon Suido Consultants, Co. Ltd., for cooperation in providing significant ideas and information.
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Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 139 • Issue 3 • March 2013
Pages: 458 - 469
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Mar 4, 2011
Accepted: May 13, 2012
Published online: May 16, 2012
Published in print: Mar 1, 2013
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