EVALUATION OF SLOPE COLLAPSE FACTORS BASED ON ACTUAL DISASTER DATA ON EXPRESSWAY IN TOHOKU REGION

Abstract

 Recently, due to the heavy rain or large scale earthquake, collapses of cut and embankment slope on the expressway have seriously influenced to economic activities and daily lives. About 40% of the expressway network has already passed more than 30 years since the construction period, and the deterioration risk becomes higher than ever. In this study, the authors scored many factors, such as topography, geology, and embankment material, based on the actual 213 collapsed cases on the expressway in Tohoku Region. And evaluated the stability and sustainability of the cut and embankment slope from the viewpoint of preventative maintenance. In addition, reviewed the evaluation result by adopting to the actual collapsed case of typhoon-19 in 2019. As a result, the possibility of the collapse can be prioritized by this scored method, and it’s useful to preventative maintenance countermeasures.