Finite element analyses of creep behaviors of non-reinforced and geogrid-reinforced sands
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Publication Details
Author list: Li F.-L., Peng F.-L., Kongkitkul W., Tatsuoka F.
Publication year: 2011
Volume number: 32
Issue number: 4
Start page: 1200
End page: 1204+1210
ISSN: 1000-7598
eISSN: 1000-7598
Abstract
Based on the experimental results of creep tests under step loading in the plane strain compression, the creep behaviors of non-reinforced and geogrid-reinforced sands have been investigated. It is found that the creep deformation is affected by the initial stress level and the initial creep strain rate in a given creep loading stage. When monotonic loading is restarted from the end of each creep loading stage, the stress-strain relation shows a very high tangent stiffness. A nonlinear finite element analysis (FEA) incorporating the unified three-component elasto-viscoplastic constitutive model for both sands and geogrids is developed. The FEA can simulate the whole process including the monotonic loadings at a constant strain rate and the creep loading stages. By comparing the simulated results with the experimental results, it is shown that the developed elasto-viscoplastic FEA can simulate the creep behaviors of non-reinforced and geogrid-reinforced sands very well, especially for the high stiffness following a creep loading stage.
Keywords
Geogrids, Reinforced sands
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