Coastal Structures and Solutions to Coastal Disasters Joint Conference 2015
A Study on the Tenacity of Coastal Dikes Constructed by Clay and Lean Cement Mixed Soil against Tsunami Overflow
Publication: Coastal Structures and Solutions to Coastal Disasters 2015: Tsunamis
ABSTRACT
The tsunami generated by the 2011 off the Pacific Coast of Tohoku earthquake caused massive damage to coastal dikes. In order to protect human lives and properties from tsunami, the tenacity of coastal dikes should be improved to secure sufficient time for evacuating residence. In this study, clay or lean cement mixed soil are used for embankment materials. The embankment materials of coastal dikes that can enhance its tenacity are investigated by means of both laboratory experiments and numerical simulations. It was cleared quantitatively from laboratory experiments that tenacity of coastal dikes was improved by using clay or cement mixed sand for embankment materials. In addition, the results from numerical simulations show that the coupled fluid-sediment interaction model considering clay cohesion has possibilities of evaluating the tenacity of coastal dikes composed of clay mixed sand.
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ACKNOWLEDGMENTS
The authors wish to thank Dr. Tomoaki Nakamura of Nagoya University for supporting the numerical simulations for erosion of dikes due to tsunami overflow by using the coupled fluid-sediment interaction model considering clay cohesion.
REFERENCES
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Nakamura, T. and Mizutani, N. (2014). “Numerical analysis of tsunami overflow over a coastal dike and local scouring at the toe of its landward slope,” Journal of JSCE, Series B3 (Ocean Eng.), Vol. 70, No.2, pp. I_516–I_521, (in Japanese).
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Published In
Coastal Structures and Solutions to Coastal Disasters 2015: Tsunamis
Pages: 118 - 127
Editors: Louise Wallendorf, U.S. Naval Academy and Daniel T. Cox, Ph.D., Oregon State University
ISBN (Online): 978-0-7844-8031-1
Copyright
© 2017 American Society of Civil Engineers.
History
Published online: Jul 11, 2017
Published in print: Jul 11, 2017
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