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A comparative study of different model families for the constitutive simulation of viscous clays

Tafili, Merita; Fuentes, William; Triantafyllidis, Theodoros

Abstract:
The simulation of the viscous behavior of some clays is of high importance in many geotechnical problems. The literature offers a vast amount of constitutive models able to simulate the rate dependence observed on these materials. Although most of thesemodels are calibrated to very similar experimental observations and share similar definitions ofmaterial parameters, some discrepancies of their response have been detected, which are related to their mathematical formulations. In this work, the causes of these discrepancies are carefully studied. To that end, four different model families are analyzed, namely, nonstationary flow surface (NSFS) models, viscoplasticity with overstress function (OVP), viscoplasticity with Norton's power law (NVP), and visco-hypoplasticity (VHP). For the sake of a fair comparison, single constitutive models using the same set of material parameters, and following other requirements, are developed for each model family. Numerical implementations of the four resulting models are performed. Their response at different tests are carefully analyzed through simulation examples and direct examination of their constitutive equations. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000105077
Veröffentlicht am 16.01.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Bodenmechanik und Felsmechanik (IBF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 0363-9061, 1096-9853
KITopen-ID: 1000105077
Erschienen in International journal for numerical and analytical methods in geomechanics
Band 44
Heft 5
Seiten 633-667
Vorab online veröffentlicht am 03.01.2020
Schlagwörter clays, NSFS, rate dependence, undrained creep rupture, visco-hypoplasticity, viscosity
Nachgewiesen in Web of Science
Scopus
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