Rate-dependent behaviour of clay during cyclic 1D compression
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Publication Details
Author list: Kawabe S., Kongkitkul W., Hirakawa D., Tatsuoka F.
Publisher: Hindawi
Publication year: 2009
Volume number: 1
Start page: 303
End page: 307
Number of pages: 5
ISBN: 9781607500315
ISSN: 0146-9428
eISSN: 1745-4557
Languages: English-Great Britain (EN-GB)
Abstract
Drained constant-rate-of-strain one-dimensional compression tests at different strain rates with and without large unload/reload cycles and many sustained loading (SL) stages, as well as standard consolidation tests, were performed on reconstituted and undisturbed soft clays. Significantly rate-dependent stress-strain behaviour of Isotach type, not due to delayed dissipation of excessive pore water pressure but due to the viscous properties of clay, was observed. The creep axial strain rate at SL stages while otherwise the effective axial stress σ′ a was increasing at positive axial strain rates ε̇ a was always positive. The creep axial strain rate at SL stages while otherwise σ′ a was decreasing was basically negative, whereas it was positive immediately after load reversal from primary loading. Irrespective of the signs of current σ̇′ a and ε̇ a, primary loading and reloading are defined by ε̇ a ir > 0, while unloading by ε̇ a ir < 0. These trends of behaviour are simulated by the non-linear three-component elasto-viscoplastic model. © 2009 IOS Press.
Keywords
Loading/unloading/reloading, One-dimensional compression, Viscous property
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