Directional response of a reconstituted fine-grained soil-Part II: performance of different constitutive models

• Published in: International journal for numerical and analytical methods in geomechanics Vol. 30; no. 13; pp. 1303 - 1336
• Main Authors: Mašín, David, Tamagnini, Claudio, Viggiani, Gioacchino, Costanzo, Daniele
• Format: Journal Article
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 01.11.2006; Wiley
• Subjects: Applied sciences; Buildings. Public works; Computation methods. Tables. Charts; Exact sciences and technology; Geotechnics; hypoplasticity; incremental non-linearity; plasticity; Soil investigations. Testing; strain response envelopes; Structural analysis. Stresses; Constitutive equation; Performance evaluation; Clay; Stress strain relation; strain response envelopes; plasticity; Calibration; Envelope; Forecast model; hypoplasticity; Response; Experimental result; Soil test; incremental non-linearity; Fine grain structure; Elastoplastic analysis; Nonlinearity; Comparative study
• ISSN: 0363-9061; 1096-9853
• DOI: 10.1002/nag.527

In this paper, the performance of different advanced constitutive models for soils is evaluated with respect to the experimentally observed behaviour of a soft reconstituted clay subject to a wide range of loading directions, see (presented in the companion paper). The models considered include a three‐surface kinematic hardening elastoplastic model; the CLoE hypoplastic model; a recently proposed K‐hypoplastic model for clays, and an enhanced version of the same model incorporating the concept of intergranular strain. A clear qualitative picture of the relative performance of the different models as a function of the loading direction is obtained by means of the incremental strain response envelopes. The definition of suitable error measures allows to obtain further quantitative information in this respect. For the particular initial conditions and loading programme considered in this study, the kinematic hardening and the enhanced K‐hypoplastic models appear to provide the best performance overall. Copyright © 2006 John Wiley & Sons, Ltd.