Rok 2024

• Experimental observations on the creep behaviour of frozen soil

  Publikacja

  • K. Staszewska
  • A. Niemunis
  • M. Cudny

  - Acta Geotechnica - Rok 2024

  Constitutive models in the literature for creep of frozen soil are based on the direct use of time counted from the onset of creep. An explicit time dependence in a constitutive equation violates the principles of rational mechanics. No change in stress or temperature is allowed for during creep, using the time-based formulations. Moreover, the existing descriptions need much verification and improvement on the experimental side...

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Rok 2022

• Pure cross-anisotropy for geotechnical elastic potentials

  Publikacja

  • A. Niemunis
  • K. Staszewska

  - Acta Geotechnica - Rok 2022

  The pure cross-anisotropy is understood as a special scaling of strain (or stress). The scaled tensor is used as an argument in the elastic stiffness (or compliance). Such anisotropy can be overlaid on the top of any elastic stiffness, in particular on one obtained from an elastic potential with its own stress-induced anisotropy. This superposition does not violate the Second Law. The method can be also applied to other functions...

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Rok 2021

• A hyperelastic model for soils with stress-induced and inherent anisotropy

  Publikacja

  • M. Cudny
  • K. Staszewska

  - Acta Geotechnica - Rok 2021

  In this paper, modelling of the superposition of stress-induced and inherent anisotropy of soil small strain stiffness is8presented in the framework of hyperelasticity. A simple hyperelastic model, capable of reproducing variable stress-induced9anisotropy of stiffness, is extended by replacement of the stress invariant with mixed stress–microstructure invariant to10introduce constant inherent cross-anisotropic component. A convenient...

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• Pure cross-anisotropy for geotechnical elastic potentials

  Publikacja

  • A. Niemunis
  • K. Staszewska

  - Rok 2021

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Rok 2019

• Modelling the time-dependent behaviour of soft soils

  Publikacja

  • K. Staszewska
  • M. Cudny

  - Studia Geotechnica et Mechanica - Rok 2019

  Time-dependence of soft soils has already been thoroughly investigated. The knowledge on creep and relaxation phenomena is generally available in the literature. However, it is still rarely applied in practice. Regarding the organic soils, geotechnical engineers mostly base their calculations on the simple assumptions. Yet, as presented within this paper, the rate-dependent behaviour of soft soils is a very special and important...

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