Takahiro Nagata
Shaking table test on seismic stability of embankment structure constructed by intermediate soil
Satoru OHTSUKA
ĦĦIn Niigata Prefecture Nakagoshi earthquake that occurred in 2004, in newly-developedĦĦbuilding estates at Taka-machi in Nagaoka City, failure of fill did buildings and regional road around newly-developed building estates. The cause of the damage of large slope failure,geological factor such as drainage basin, and torrential rain by the typhoon immediately before the earthquake expanded damage. It has been understood that it is result intermediate soils of doing Triaxial tests of earthfill of Taka-machi. When a physical characteristic and mechanics characteristic of fill material were examined, it was classified into sand, clay, and an intermediate soil. The example of researching failure mechanism of fill that uses the ground material that contains a lot of minute grain in a current research is few. In this study, collapse mechanism and arrangement of factor to cause slope failure are arranged to evaluate the influence of the slope failure and those factors. As a result of this experiment to approach effectively measurers and, it aims at the development of the analysis technique that can simulate the slope failure. Stability analysis by seepage analysis and rigid plastic finite element method is done, water level of model fill, it was thought that it was going to express slip surface and failure mechanism that had been obtained because of the experiment.
ĦĦThe following have been understood from the examination result. The decrease in shear strength by increase of water pressures is large for the high water level. Especially, it large slope failure because at the toe of slope of effctive stress decreases greatly. It becomes an equivalent result when there is measure. Response acceleration rapid increases in the vicinity of the ground level for the low water level. Slip surface is formed with water line. Response acceleration is controlled in the vicinity of the ground level for the measure. The decrease in shear strength by increase of water pressures is large. It's recognized that the effect of countermeasures of the top of the embankment.
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