COMPARISON OF PREDICTIVE CAPABILITIES OF SELECTED ELASTO-PLASTIC AND HYPOPLASTIC MODELS FOR STRUCTURED CLAYS(<Special Issue>Geomechanics of Structured Materials) :

  • MASIN,DAVID
    Charles University in Prague, Faculty of Science, Institute of Hydrogeology, Engineering Geology and Applied Geophysics

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Abstract

This paper compares different approaches to constitutive modelling of natural structured clays by means of experimental data on natural Pisa and Bothkennar clays. The models evaluated are a hypoplastic model for structured clays, its simple elasto-plastic equivalent that requires parameters with similar physical meaning, and advanced elasto-plastic models based on kinematic hardening approach. Hypoplasticity predicts non-linear stress-strain response in the pre-failure region and different stiffness in different loading directions, it thus provides a clear qualitative advance with respect to the simple elasto-plastic model. It gives qualitatively similar predictions with the kinematic hardening models. The structure degradation and the large-strain response are predicted similarly by both the hypoplastic and elasto-plastic models, which show that the critical state soil mechanics theories can be treated successfully within the framework of the theory of hypoplasticity.

Journal

  • Soil and foundation

    Soil and foundation 49 (3), 381-390,

    Japanese Society of Soil Mechanics and Foundation Engineering

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