Abstract
Embankment reinforcement with steel sheet piles is presented as a countermeasure against tsunami overflow, which is known as a main cause of failures of coastal embankments due to the 2011 tsunami. In the presenting structure, one or two vertical sheet piles are put inside the embankment and they are expected to keep total height of the embankment after severe erosion of landward slope. The effect of the sheet pile structures was discussed through hydraulic experiments in a horizontal open-channel with a 1/50 embankment model. Deformation of the embankment and the sheet pile structure was recorded by a video camera and strain gauges. Embankment height after overflow was about 70% and 95% of the initial height respectively for one and two sheet pile structure while it was only 17% for non-pile structure.
