Statistical analysis of the topographic effect on earthquake induced slope failure

-From the case histories at Noto Toll Road in 2007 Noto-Hanto Earthquake-

Abstract

A slope failure occurred at an embankment of Tomei Expressway in the earthquake at Suruga-bay, in 2009. The impact of the disaster to the society was so large that the emergency check-ups for embankment slopes were conducted. The target of the check-up are slopes for the embankment with 10m height or more, located at the mouth of drainage basin and reclaimed with material possibly deteriorated by slaking phenomenon. However, there is no clear standard for the definition of drainage basin, and no reasons for the limitation to the embankment with 10m height or more.
In this research, the effects of topological condition for slope failure were statistically analyzed based on the case histories of Noto Toll Road damaged in 2007 Noto-Hanto Earthquake. The application of the orderd-probit model clarified which kind of topological condition is important to assess the seismic risk of slope failures of embankment.