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

Fuentes, William; Triantafyllidis, Theodoros

doi:10.1002/nag.2370

Cited by 71 publications

(44 citation statements)

References 49 publications

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“…For an application of the approach of Wegener and Herle, to reduce the strain accumulation by changing the fade‐in of the nonlinear model, only the exponent

χ

in the third term of Equations and has to be changed. As the ISA model is also applicable to hypoplastic models using the

bold-scriptL

‐

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formulation, the possibility of applying the ISA model to other material models is provided by the approaches presented here. However, it has to be mentioned that the shortcomings of the original intergranular strain concept are also reproduced by the here presented approaches; see Figure .…”

Section: Comparison and Simulationsmentioning

confidence: 99%

“…This concept was extended by several authors, eg, Wegener and Herle, Mašín or Fuentes and Triantafyllidis, to improve its performance and to capture more soil features. Wegener and Herle added an additional material parameter to control the transition between the small strain and the large strain model.…”

Section: Introductionmentioning

confidence: 99%

“…Mašín added an anisotropic model for the linear part of the material model and allowed for a nonlinear dependence of the very smallstrain shear modulus on the mean effective stress. Fuentes and Triantafyllidis introduced the intergranular strain anisotropy (ISA) model, which incorporates a yield surface within the intergranular strain space. This allowed for improved predictions of the memory effects upon reloading paths, which also improved predictions of the strain accumulation in cyclic tests and reduced the overshooting effects.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An intergranular strain concept for material models formulated as rate equations

Bode

Fellin

Maš́ın

et al. 2020

Num Anal Meth Geomechanics

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Summary The intergranular strain concept was originally developed to capture the small‐strain behaviour of the soil with hypoplastic models. A change of the deformation direction leads to an increase of the material stiffness. To obtain elastic behaviour for smallstrains, only the elastic part of the material stiffness matrix is used. Two different approaches for an application of this concept to nonhypoplastic models are presented in this article. These approaches differ in the determination of the elastic stress response, which is used for reversible deformations. The first approach determines an elastic response from the original material model, and the second one uses an additional elastic model. Both approaches are applied on barodesy. The simulations are compared with experimental results and with simulations using hypoplastic models with the original intergranular strain concept.

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“…For an application of the approach of Wegener and Herle, to reduce the strain accumulation by changing the fade‐in of the nonlinear model, only the exponent

χ

in the third term of Equations and has to be changed. As the ISA model is also applicable to hypoplastic models using the

bold-scriptL

‐

boldN

Section: Comparison and Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An intergranular strain concept for material models formulated as rate equations

Bode

Fellin

Maš́ın

et al. 2020

Num Anal Meth Geomechanics

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show abstract

“…To improve simulations of the nonlinear response in the small‐strain range and accumulative strains under cycling with small strain amplitude, hypoplastic constitutive models with intergranular strain (IS) have been proposed by Niemunisand and Herle . Recently, the framework of intergranular strain anisotropy (ISA) has been proposed by Fuentes and Triantafyllidis and Poblete et al, in which the existence of an elastic region allows improvement of model performance under cyclic loading conditions, such as memory effects and elevated stiffness upon stress reversal. Other recent development of hypoplastic models can be found for simulating frozen soils and rate‐dependency of granular soils .…”

Section: Introductionmentioning

confidence: 99%

A hypoplastic model for granular soils incorporating anisotropic critical state theory

Yang

Liao

2020

Num Anal Meth Geomechanics

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Summary It is well known that soil is inherently anisotropic and its mechanical behavior is significantly influenced by its fabric anisotropy. Hypoplasticity is increasingly being accepted in the constitutive modeling for soils, in which many salient features, such as nonlinear stress‐strain relations, dilatancy, and critical state failure, can be described by a single tensorial equation. However, within the framework of hypoplasticity, modeling fabric anisotropy remains challenging, as the fabric and its evolution are often vaguely assumed without a sound basis. This paper presents a hypoplastic constitutive model for granular soils based on the newly developed anisotropic critical state theory, in which the conditions of fabric anisotropy are concurrently satisfied along with the traditional conditions at the critical state. A deviatoric fabric tensor is introduced into the Gudehus‐Bauer hypoplastic model, and a scalar‐valued anisotropic state variable signifying the interplay between the fabric and the stress state is used to characterize its impact on the dilatancy and strength of the soils. In addition, fabric evolution during shearing can explicitly be addressed. Modifications have also been undertaken to improve the performance of the undrained response of the model. The anisotropic hypoplastic model can simulate experimental tests for sand under various combinations of principle stress direction, intermediate principal stress (or mode of shearing), soil densities, and confining pressures, and the associated drastic effect of different principal stress orientations in reference to the material axes of anisotropy can be well captured.

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“…TA04031603 2014). For those interested in new developments in the field of intergranular strain we refer to a recent work on this subject by (Fuentes and Triantafyllidis, 2015).…”

mentioning

confidence: 99%

Applying hypoplastic model for soft soils to the analysis of anchored sheeting wall

Kadlíček¹

2015

Acta Geodynamica Et Geomaterialia

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This paper is concerned with a practical application of the hypoplastic constitutive model for soft soils. In particular, two specific implementations, so called standard and the one based on smallstrain theory, are considered and the resulting predictions are compared with those provided by the Mohr-Coulomb model. As an example, we considered an anchored underground wall built during the construction of extension of the line A of Prague's subway. The results of all numerical simulations obtained with the help of Geo5 FEM software were also compared with in situ measurements with attention devoted mainly to the evolution of deformation of the underground wall and of pre-stress forces of rope anchors. It is shown that extended formulation of the hypoplastic model accounting for high stiffness of soil at very small strains should be adopted to arrive at reliable and meaningful predictions of the soil response. ARTICLE INFO

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

Cited by 71 publications

References 49 publications

An intergranular strain concept for material models formulated as rate equations

An intergranular strain concept for material models formulated as rate equations

A hypoplastic model for granular soils incorporating anisotropic critical state theory

Applying hypoplastic model for soft soils to the analysis of anchored sheeting wall

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