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Analysis of the destruction of an embankment in the 2007 Noto Peninsula Earthquake


Analysis of the seismic response of a foundation ground improved by the sand compaction pile (SCP)


Analysis of the behaviour of a foundation-embankment coupled system, based on an experiment using a centrifugal loading model

Reports of damage to embankments from earthquakes are frequent, but the state of the damage is likely to vary depending on the conditions in the embankment and in the foundation beneath. With this in mind, a numerical analytic investigation was conducted of differences in seismic and post-seismic deformation behavior depending on initial variations in the firmness (density) of the foundation and embankment.

The results showed that: ① where the foundation and embankment were both firm, stability was maintained both during and after the quake, with only small amounts of deformation; ② where the foundation was firm but the embankment soft, there was a concentration of deformation in the embankment, resulting in considerable lateral swelling; ③ where the embankment was firm but the foundation soft, stability was preserved during the quake, but damage from circular slip occurred afterwards.

  1. Noda, A., Nakai, K. and Asaoka, A. (2008): Consolidation of clay and compaction/liquefaction of sand - A structure theoretic approach -, Theoretical and Applied Mechanics JAPAN, Vol.57, pp.41-47.

3-dimensional analysis・・・effect on ground settlement.


Seismic stability assessment of a temporary structure on a soft foundation


The nature of the transition “from deformation to destruction”

Using the example of a classic bearing force problem, an analysis was performed on the assumption that deformation and destruction do not need to be viewed as separate phenomena, but that destruction can be taken as the end stage of a path of deformation. The results clearly: ① reproduced phenomena such as the progressive onset of an obvious circular slip line with the increase of the displacement control load on the structure foundation, and then the fall off in load (load softening) that followed; ② showed that differences in initial conditions such as the state and the initial irregularities of the soil, or the presence or absence of friction in the load, have an influence on the ultimate load and on the destruction state.

  1. Noda,T., Asaoka, A. and Yamda, S. (2007): Some bearing capacity characteristics of a structured naturally deposited clay soil. Soils & Foundations, Vol.47, No.2, pp.285-301.


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