SEISMIC BEHAVIOURS OF LEVEES REINFORCED BY DEEP MIXING METHOD

Abstract

 In the Great East Japan Earthquake, tsunami overflowed coastal levees, and the water flow destroyed many levees. After the disaster, various countermeasures have been proposed, one of which is to maintain the height of the levee top while permitting the destruction of embankment slope. The present study also investigated this method, constructing the cement-treated-soil walls inside the levee. The levee models in which wall or grid-type improvement was embedded in the centre were shaken in centrifuge. As a result, it was confirmed that the ground was liquefied by shaking and the embankment slope collapsed, but the height of the top was almost maintained, and the improved ground was not damaged. They successfully showed the efficacy of the proposed method.