Proceedings of the International Conference on Press-in Engineering
Online ISSN : 2436-1720
First International Conference

Session C: Tsunami / Landslide
Evaluating the Efficiency of Jacked-in Piles as Tsunami Defences
会議録・要旨集 フリー

p. 289-296


The 2011 Tōhoku earthquake and tsunami brought into question the adequacy of the pre-existing shallow foundation seawall design due to the large number of failures recorded. A new type of seawall made of adjoining large, jacked-in, steel pipe piles embedded 10-15m into the ground is currently installed along the Kochi coastline. Seawall design against tsunamis is a unique, true ULS design, which presently is carried out using codes of practice not specifically tailored for this scenario. Through small scale wave flume experiments and lateral loading tests of single piles at full-scale the adequacy of current design methodology as well as the efficiency of the new steel pile seawall design is assessed. It is found that current Japanese codes, although designed for tsunami shelters, provide appropriate predictions of wave force for the case of seawalls needing to withstand overtopping waves. The lateral pile tests highlight the current codes’ accuracy in predicting pile stiffness and bending moment profile. Remaining shortcomings, such as no provision in current seawall design for the effects of soil softening during tsunamis, are evinced. Even so, steel pile walls seem an effective seawall solution due to their high embedment and capacity to dissipate wave energy through yielding.

© 2018 International Press-in Association
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