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| Titel |
Effects of relative density and accumulated shear strain on post-liquefaction residual deformation |
| VerfasserIn |
J. Kim, M. Kazama, Y. Kwon |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 13, no. 10 ; Nr. 13, no. 10 (2013-10-18), S.2567-2577 |
| Datensatznummer |
250085535
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| Publikation (Nr.) |
 copernicus.org/nhess-13-2567-2013.pdf |
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| Zusammenfassung |
| The damage caused by liquefaction, which occurs following an earthquake, is
usually because of settlement and lateral spreading. Generally, the
evaluation of liquefaction has been centered on settlement, that is,
residual volumetric strain. However, in actual soil, residual shear and
residual volumetric deformations occur simultaneously after an earthquake.
Therefore, the simultaneous evaluation of the two phenomena and the
clarification of their relationship are likely to evaluate post-liquefaction
soil behaviors more accurately. Hence, a quantitative evaluation of
post-liquefaction damage will also be possible. In this study, the effects
of relative density and accumulated shear strain on post-liquefaction
residual deformations were reviewed through a series of lateral
constrained-control hollow cylindrical torsion tests under undrained
conditions. In order to identify the relationship between residual shear and
residual volumetric strains, this study proposed a new test method that
integrates monotonic loading after cyclic loading, and K0-drain after
cyclic loading – in other words, the combination of cyclic loading, monotonic
loading, and the K0 drain. In addition, a control that maintained the
lateral constrained condition across all the processes of consolidation,
cyclic loading, monotonic loading, and drainage was used to reproduce the
anisotropy of in situ ground. This lateral constrain control was performed
by controlling the axial strain, based on the assumption that under
undrained conditions, axial and lateral strains occur simultaneously, and
unless axial strain occurs, lateral strain does not occur. The test results
confirmed that the recovery of effective stresses, which occur during
monotonic loading and drainage after cyclic loading, respectively, result
from mutually different structural restoration characteristics. In addition,
in the ranges of 40–60% relative density and
50–100% accumulated shear strain, relative density was
found to have greater effects than the number of cycles (accumulated shear
strain). |
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