Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
Online ISSN : 1883-8944
Print ISSN : 1884-2399
ISSN-L : 1883-8944
Paper (In Japanese)
Study on the Erosion Mechanisms of Soil Embankment by Tsunamis Considering the Effect of the Pore Water Pressure
Yosuke NAGASAKAShinji SATO
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2013 Volume 69 Issue 2 Pages I_566-I_570

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Abstract

The field survey of the 2011 Tohoku Tsunami in Unosumai District of Kamaishi City, Iwate Prefecture suggested the collapse of embankment due to momentary liquefaction. We performed numerical simulation of the effect of pore pressure variation on the stability of embankment. A consolidation model considering saturation of the soil was applied. The numerical analysis demonstrated that the embankment with lower saturation can be unstabilized by the rapid drawdown due to tsunami. Laboratory experiment in the oscillatory flow tunnel also verified that unsaturated sand bed becomes unstable by the rapid decrease in pressure and thus significantly increases the sand transport rate.

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© 2013 by Japan Society of Civil Engineers
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