Abstract
About 4,200 places of cracks and steps at the road surface were confirmed at the embankment of the expressway by Tohoku district Pacific coast earthquake to be generated on March 11, 2011. In addition, the damage a trouble has caused in traffic in a main line was 21, and these were extensive damage relatively. We analyzed collapsed factor of embankment of 3 places. The topography by which an embankment collapses in an earthquake in the past was the ravine where foundation inclined and soft ground. Further, such as excess pore water pressure inside the embankment in the flat ground became expensive because of this earthquake, an embankment of the condition that surface moistures are collected collapsed. This paper, we assumed clearly that it collapsed big when agreeing with the fixed condition by an analysis of the factor by which an embankment at the flat ground collapsed. Furthermore, the method of construction of earthquake-proof measures effective and practical to an embankment of the similar condition was proposed.
