Study on reinforcement effect of double sheet-pile wall installed in dyke as the countermeasure against large scale earthquake

Abstract

Many coastal dykes were damaged and collapsed during the 2011 off the Pacific coast of Tohoku Earthquake. The application of double sheet-pile walls to dykes has been proposed as an effective reinforcement method against earthquakes and flood hazards. In this study, double sheet-pile walls were confirmed to be effective in reducing the settlement of coastal dyke on liquefied ground during a large scale earthquake with high acceleration amplitude and long duration based on shaking model tests. In addition, numerical analyses indicated that the countermeasure by double sheet-pile walls was very effective for high acceleration amplitude and long duration earthquake.