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AVISA: anisotropic visco-ISA model and its performance at cyclic loading [in press]

Tafili, Merita; Triantafyllidis, Theodoros

Abstract:
In this work, a constitutive model able to capture the strain rate dependency, small strain effects and the inherent anisotropy is proposed considering the influence of the overconsolidation ratio (OCR). Small strain effects are captured by using an extended ISA plasticity formulation (Fuentes and Triantafyllidis in Int J Numer Anal Methods Geomech 39(11):1235–1254, 2015). The strain rate dependency is reproduced by incorporating a third strain rate mechanism (in addition to the elastic and hypoplastic strain rate). A loading surface has been incorporated to define a three-dimensional (3D) overconsolidation ratio and to account for its effects on the simulations. Experimental investigations using Kaolin Clay and Lower Rhine Clay with horizontal bedding plane have shown that under undrained cycles of small strain amplitudes (<10$^{-4}$), the effective stress path in the p–q space is significantly inclined towards the left upper corner of the p - q plane. Consequently, a transversely (hypo)elastic stiffness has been successfully formulated to capture this behaviour. The performance of the model has been inspected by simulating the database of approximately 50 cyclic undrained triaxial (CUT) tests on low-plasticity Kaolin Clay (Wichtmann and Triantafyllidis) considering different deviatoric stress amplitudes, initial stress ratios, displacement rate, overconsolidation ratio and cutting direction. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000117643
Veröffentlicht am 10.03.2020
Originalveröffentlichung
DOI: 10.1007/s11440-020-00925-9
Web of Science
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Bodenmechanik und Felsmechanik (IBF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1861-1125, 1861-1133
KITopen-ID: 1000117643
Erschienen in Acta geotechnica
Vorab online veröffentlicht am 19.02.2020
Schlagwörter Anisotropy, Clay, Cyclic loading, Excessive pore water pressure, Rate dependency, Soft soils, Silt, Time dependency, Viscosity
Nachgewiesen in Scopus
Web of Science
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