Abstract
As a result, it flowed on extremely soft ground and the foundation had become the form of the board. Especially the collapsed place became clear that it is banking on clay. 2011-Tohoku (northeast) Earthquake caused massive embankment collapse over 4.8 hectares in Tate New Town of Ichinoseki, Iwate Prefecture. The embankment height was about 10 meters (m). About 20 buildings in the area also suffered damage. During the recovery period of the calamity, an investigation was conducted on foundation, and inclination of buildings to analyze causes of this destruction. The results of the analysis showed slippage on extremely soft ground of the foundation has occurred thus embankment has collapsed over 5 to 7 m in its thickness. Especially in the collapsed location, it became clear that it is associated with an overlay of clay. Therefore, this paper aims to analyze the results of the investigations of aforementioned failures to safeguard against future happenings through lessons learned.
