Analysis of the mechanism of embankment failure during the 2007 Chuetsu Oki Earthquake, Japan

TL;DRAbstract

This article presents the results of an analysis conducted to investigate the mechanism of embankment failure during the 2007 Chuetsu Oki earthquake (MJMA=6.6) that occurred in Niigata Prefecture, Japan. Data from field investigation were utilized to reconstruct a cross-section of the slope prior to the earthquake, and to estimate the in-situ properties of soil from the landslide mass. It was found that the failure plane formed in a saturated layer of sandy soil near a boundary with bedrock. Laboratory investigation, including a series of triaxial compression tests, was conducted to evaluate the liquefaction potential of the soil as well as to provide a basis for numerical analysis. Slope stability analysis performed on the basis of FEM procedure for the conditions existing before the earthquake yielded a safety factor of 1.18, indicating that the slope was amply stable prior to the earthquake. Results of undrained cyclic loading triaxial tests in conjunction with seismic response anal

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