A strain space soil model with evolving stiffness anisotropy

Ellison, Kirk; Soga, Kenichi; Simpson, Brian

doi:10.1680/geot.10.p.095

Cited by 18 publications

(8 citation statements)

References 25 publications

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“…A further paper describing this experience is in preparation. Implementation guide for the SRD BRICK model (to be read in conjunction with Simpson (1992) and Ellison et al (2011)) The BRICK model is implemented as an iterative routine which identifies the stress changes produced by a given strain increment. Implementing a second iterative routine within the first one, to deal with the plastic strain rate dependency of the string lengths, could prove computationally expensive.…”

Section: Discussionmentioning

confidence: 99%

Modelling of viscous effects in natural clays

Clarke

Hird

2012

Can. Geotech. J.

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A new approach to allow the modelling of the viscous behaviour of natural clay soils, including creep, stress relaxation and the effects of applied strain rate on soil stiffness, has been developed based on the BRICK constitutive model (Simpson, 1992). The new model, SRD (Strain Rate Dependent) BRICK, was used in a series of simulations to demonstrate its capabilities in predicting realistic behaviour during onedimensional compression and undrained triaxial tests in which applied strain rates were varied. Triaxial stress path tests conducted by Gasparre et al. (2007) to assess the influence of creep, resulting from recent stress history, on soil stiffness were also simulated. The observed trends concerning the stiffness at small strains were successfully modelled.

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Section: Discussionmentioning

confidence: 99%

Modelling of viscous effects in natural clays

Clarke

Hird

2012

Can. Geotech. J.

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“…Different versions of the BRICK model are reported in the literature giving satisfactory results in various FE computations, e.g. [9,11,14,23,25,40,43]. The original BRICK model [38] has been developed in plane strain for which volumetric strain and shear strain are appropriate axes-the sides of the room where the described pulling process takes place.…”

Section: Hs-brick Formulationmentioning

confidence: 99%

“…In the 3D extension of the original BRICK model [25], these axes were replaced with volumetric strain axis and five shear strain axes. Additionally, the pulling process of a given brick is enhanced by the so-called plastic strain reduction which provides volumetric strain hardening by repositioning the bricks [14].…”

Section: Hs-brick Formulationmentioning

confidence: 99%

Refinement of the Hardening Soil model within the small strain range

Cudny

Truty

2020

Acta Geotech.

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The popularity of the elasto-plastic Hardening Soil (HS) model is based on simple parameter identification from standard testing and empirical formulas. The HS model is implemented in many commercial FE codes designed to analyse geotechnical problems. In its basic version, the stress-strain behaviour within the elastic range is subject to the hypoelastic power law, which assures the barotropy of the elastic stiffness. However, a proper modelling within the small strain range, i.e. strain-induced stiffness degradation and correct reproduction of the hysteretic behaviour, was one of the most important drawbacks in the HS formulation. The first small strain stiffness extension to the HS model was proposed by Benz (Small strain stiffness of soils and its numerical consequences, 2007), and the new model was called Hardening Soil Small (HSS). Despite the simple isotropic formulation, its applicability was proved in various numerical simulations in geotechnics. However, the HSS formulation exhibits a serious fault known in the literature as overshooting, i.e. uncontrolled reset of the loading memory after tiny unloading-reloading cycles. The authors' main aim was to retain the set of material parameters for the HSS formulation and to propose a new small strain extension to the HS model without overshooting. The new proposal is based on the BRICK model which represents the concept of nested yield surfaces in strain space. The implementation aspects of the new HS-Brick model are described, and its performance is presented in some element tests and selected boundary value problems by comparisons with the HSS formulation.

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“…These and other shortcomings allowed some alternative frameworks to emerge. Examples of them are the hyperplastic models , the Karlsruhe hypoplastic models extended with intergranular strain , endochronic models , and other models defining the yield surface within the strain space . All these frameworks are said to be strain based because they do not require a yield condition describing a surface within the stress space.…”

Section: Introductionmentioning

confidence: 99%

ISA model: A constitutive model for soils with yield surface in the intergranular strain space

Fuentes

Triantafyllidis

2015

Int. J. Numer. Anal. Meth. Geomech.

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Summary In this article, a new constitutive model for soils is proposed. It is formulated by means of plasticity, but in contrast to the precedent works, it presents a yield function describing a surface within the intergranular strain space. This latter is a state variable providing information of the recent strain history. An expression for the plastic strain rate has been proposed to guarantee the stress rate continuity. Under the application of medium or large strain amplitudes, the constitutive equation becomes independent of the intergranular strain and delivers a mathematical structure similar to some Karlsruhe hypoplastic models. Some simulations of monotonic and cyclic triaxial test are provided to evaluate and analyze the model performance. Copyright © 2015 John Wiley & Sons, Ltd.

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A strain space soil model with evolving stiffness anisotropy

Cited by 18 publications

References 25 publications

Modelling of viscous effects in natural clays

Modelling of viscous effects in natural clays

Refinement of the Hardening Soil model within the small strain range

ISA model: A constitutive model for soils with yield surface in the intergranular strain space

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