| Several large earthquakes in the past have caused significant deformation to road embankments and river levees constructed on highly organic and extremely weak peaty ground. Previous studies have revealed the mechanism behind this deformation as: 1) settlement of the layer into which the bottom of the embankment on peaty ground sinks; 2) dissolution of the toe of the slope into mud due to the generation of excess pore water pressure in the layer into which the embankment sinks; and 3) lateral flow of the peat layer.[*]While the use of gabion boxes to facilitate drainage is known to be effective as a measure against dissolution of the toe of the slope into mud、 techniques for seismic assessment and rational seismic strengthening have yet to be clarified. Accordingly、 a centrifugal model test was conducted concerning rational seismic strengthening of existing embankments on peaty ground. The results revealed that ground improvement at the toe of the slope using cement stabilization was effective against large deformation of embankments during earthquakes. |
