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Modeling of Soil Behaviour: from Micro-Mechanical Analysis to Macroscopic Description

  • Roberto Nova
Part of the Modeling and Simulation in Science, Engineering and Technology book series (MSSET)

Abstract

The macroscopic behaviour of soil is influenced by its mi­croscopic characteristics. Elementary considerations on friction and grain interlocking lead first to the formulation of an elastic plastic model with isotropic hardening or softening. Micromechanical considerations suggest also that the flow rule should be non-associative. As a consequence, unsta­ble specimen responses, such as static liquefaction and shear banding are possible, even in the hardening regime. In order to model the behaviour in complex tests, an extended model taking induced anisotropy into account is formulated next. Further, we shall show how the time needed for rearrang­ing the internal structure under loading influences the overall response of a specimen. The introduction of a time and a length scale in the macroscopic constitutive model will also help in regularising the numerical response in initial boundary value problems. Finally some features related to the de­scription of soil behaviour at small strains and in unloading-reloading will be briefly discussed.

Keywords

Shear Band Volumetric Strain Triaxial Compression Stress Path Yield Locus 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 2002

Authors and Affiliations

  • Roberto Nova
    • 1
  1. 1.Dipartimento di Ingegneria Strutturale Politecnico di MilanoPiazza Leonardo da Vinci, 32MilanoITALY

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