Abstract
The Noto Hanto Earthquake in 2007 caused large-scale landslide failures of embankments in NOTO YURYO road. The landslide mainly occurs in the embankment on inclined ground after the earthquake, not on horizontal ground. In this study, seismic deformation behavior of embankments both on horizontal and on inclined ground are simulated by the soil-water coupled finite deformation analysis code, GEOASIA, and the simulation revealed a mechanism of landslide of embankment on inclined ground after earthquake. The main conclusion is shown as follows (1) The behaviors of the embankment materials are reproduced by SYS Cam-clay model. (2) The analysis shows that the embankment on horizontal ground does not fail due to earthquake like actual behavior. The main reason is that the embankment stabilizes by consolidation after the earthquake. (3) The embankment on inclined ground fails after the earthquake through analysis. After the earthquake generates the negative pore pressure in the embankment, the embankment swell by dissipating the pore pressure, and finally the embankment failed. During swelling, loss of over consolidation and upgradation of structure occurs with plastic swelling in the embankment.
