Acta Geotechnica

, Volume 13, Issue 2, pp 367–386 | Cite as

An ISA-plasticity-based model for viscous and non-viscous clays

  • W. Fuentes
  • M. Tafili
  • Th. Triantafyllidis
Research Paper


The ISA-plasticity is a mathematical platform which allows to propose constitutive models for soils under a wide range of strain amplitudes. This formulation is based on a state variable, called the intergranular strain, which is related to the strain recent history. The location of the intergranular strain can be related to the strain amplitude, information which is used to improve the model for the simulation of cyclic loading. The present work proposes an ISA-plasticity-based model for the simulation of saturated clays and features the incorporation of a viscous strain rate to enable the simulation of the strain rate dependency. The work explains some aspects of the ISA-plasticity and adapts its formulation for clays. At the beginning, the formulation of the model is explained. Subsequently, some comments about its numerical implementation and parameters determination are given. Finally, some simulations are performed to evaluate the model performance with two different clays, namely a Kaolin clay and the Lower Rhine clay. The simulations include monotonic and cyclic tests under oedometric and triaxial conditions. Some of these experiments include the variation of the strain rate to evaluate the viscous component of the proposed model.


Clays Constitutive models Cyclic loading ISA-plasticity Viscosity 

Supplementary material


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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.University del NorteBarranquillaColombia
  2. 2.Institute of Soil Mechanics and Rock MechanicsKarlsruhe Institute of Technology KITKarlsruheGermany

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