Publikationsdatum:
2004-02-01
Beschreibung:
Prediction of deformations during earthquake loading is one of the critical aspects in the design of a geotechnical engineering structure. The dynamic behavior of two centrifuge model sand embankments including deformations is presented and compared with blind predictions made by a fully coupled analysis procedure, the computer code DYSAC2, using a bounding surface elastoplastic model. The centrifuge model embankments were constructed using Nevada sand placed at 62% (dense) and 43% (medium dense) relative densities and consisted of a mild slope on one side and a steep slope on the other side. Both embankments showed substantial movements along the slopes, spikes in the upslope acceleration values, and corresponding dilation spikes in the pore-pressure values. These spikes were more pronounced for the medium-dense sand embankment and on the mild-slope sides for both embankments. The observed behavior is related to the stressstrain behavior of sands undergoing cyclic mobility, and the importance of accurately obtaining the initial static stresses is emphasized. The blind predictions using the computer code DYSAC2 compared reasonably well with the measured results and provided further insight into the behavior of these embankments. The blind predictions similar to those shown in this paper are expected to provide confidence for practicing engineers to use fully coupled procedures for predicting deformations of geotechnical structures subjected to earthquakes.Key words: centrifuge modeling, cyclic mobility, earthquakes, embankment, fully coupled analysis, sand.
Print ISSN:
0008-3674
Digitale ISSN:
1208-6010
Thema:
Geologie und Paläontologie
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