Protecting against Future Tsunamis by Strengthening Existing Embankments Using Muddy Soil and Cement

Abstract

The earthquake that occurred three years ago generated huge tsunamis, and it caused serious damage to Japan. To create stronger embankments in case of future tsunamis, so many studies have been conducted. In renovating coastal dikes, we must consider not only function, but also landscape conservation and depletion of limited natural resources. Based on these considerations, we apply a rehabilitation technique for fill-type dam embankments to strengthen coastal dikes. It uses muddy soil (for example dredged soil from port) mixed with cement, which provides excellent resistance against earthquakes and tsunamis. In this paper, we have developed a new soil-improvement technique for coastal dikes.