Effects of soil fabric on behaviors of granular soils: Microscopic modeling

Yimsiri, S; Soga, Kenichi

doi:10.1016/j.compgeo.2011.06.006

Cited by 49 publications

(10 citation statements)

References 42 publications

(43 reference statements)

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“…[72,88] and numerical simulations (e.g. [70,87,93]) demonstrated that the shear mode has a significant influence on the strength and deformation behaviour of granular materials. The shear mode is normally measured by the intermediate stress ratio (b value) or Lode's angle h l .…”

Section: Effects Of Shear Modementioning

confidence: 99%

Constitutive modelling of granular materials using a contact normal-based fabric tensor

Yang

et al. 2019

Acta Geotech.

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This paper presents a fabric tensor-based bounding surface model accounting for anisotropic behaviour (e.g. the dependency of peak strength on loading direction and non-coaxial deformation) of granular materials. This model is developed based on a well-calibrated isotropic bounding surface model. The yield surface is modified by incorporating the back stress which is proportional to a contact normal-based fabric tensor for characterising fabric anisotropy. The evolution law of the fabric tensor, which is dependent on both rates of the stress ratio and the plastic strain, rules that the material fabric tends to align with the loading direction and evolves towards a unique critical state fabric tensor under monotonic shearing. The incorporation of the evolution law leads to a rotational hardening of the yield surface. The anisotropic critical state is assumed to be independent of the initial values of void ratio and fabric tensor. The critical state fabric tensor has the same intermediate stress ratio (i.e. b value) and principal directions as the critical state stress tensor. A non-associated flow rule in the deviatoric plane is adopted, which is able to predict the non-coaxial flow naturally. The stress-strain relation and fabric evolution of model predictions show a satisfactory agreement with DEM simulation results under monotonic shearing with different loading directions. The model is also validated by comparing with laboratory test results of Leighton Buzzard sand and Toyoura sand under various loading paths. The comparison results demonstrate encouraging applicability of the model for predicting the anisotropic behaviour of granular materials.

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Section: Effects Of Shear Modementioning

confidence: 99%

Constitutive modelling of granular materials using a contact normal-based fabric tensor

Yang

et al. 2019

Acta Geotech.

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“…Thus, the minimum size for the specimens can be determined through Variability of Specimen Generation Because the DEM specimens were randomly generated, different generations can produce different initial fabrics for the same initial porosity and confinement. These differences can affect the mechanical behavior (Yimsiri and Soga 2011). To study the influence of the variability of specimen generation on the stress-strain response, two extreme GSDs (C u 5 1:0 and C u 5 6:0) were generated with three different random seeds (g1 5 10,000; g2 5 50,000; Fig.…”

Section: Number Of Particlesmentioning

confidence: 99%

Grading-Dependent Behavior of Granular Materials: From Discrete to Continuous Modeling

Liu

Dano

et al. 2015

J. Eng. Mech.

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International audienceThe aim of this paper is to investigate the effect of soil grading on the stress-strain and the critical-state behavior of granular materials from idealized spheres to natural soils as well as from discrete to continuous modeling. The three-dimensional discrete-element method has been applied to study the mechanical behavior of idealized granular materials. The results conﬁrm that the critical-state line (CSL) shifts down-ward as grading broadens with an increase of the coefﬁcient of uniformity Cu. An exponential relationship between the critical-state parameters and the coefﬁcient of uniformity Cu can then be established. Furthermore, experimental investigations on an artiﬁcial material (glass beads) and a natural material (Hostun sand) were carried out. The experimental results conﬁrm the grading dependency of the critical-state behavior, and a similar relationship between CSL and Cu, for both glass beads and natural sand, extending previous literature results for high Cu values up to 20. Moreover, the experimental results show that the CSL tends to stabilize when the coefﬁcient of uniformity Cu becomes higher than 10. Based on all test results, a simple elastoplastic model accounting for the inﬂuence of the grain size distribution (GSD) on the mechanical behavior of granular materials has been developed within the framework of critical-state soil mechanics. Comparisons between experimental results and simulations show that the model can accurately reproduce the mechanical behavior of granular materials with different GSDs

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“…Micromechanical investigations have shown that fabric is the fundamental reason for the anisotropy of the mechanical behaviors of soils . A fabric tensor is essential for constitutive modeling of anisotropic soils . It quantifies the internal structure formed in soils, such as the spatial distribution of particles, voids, or contact normals.…”

Section: Fabric Tensormentioning

confidence: 99%

Anisotropic UH model for soils based on a simple transformed stress method

Yao

Tian

Gao

2016

Num Anal Meth Geomechanics

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A simple method, called anisotropic transformed stress (ATS) method, is proposed to develop failure criteria and constitutive models for anisotropic soils. In this method, stress components in different directions are modified differently in order to reflect the effect of anisotropy. It includes two steps of mapping of stress. First, a modified stress tensor is introduced which is a symmetric multiplication of stress tensor and fabric tensor. In the modified stress space, anisotropic soils can be treated to be isotropic. Second, a transformed stress tensor is derived from the modified stress tensor for the convenience of developing anisotropic constitutive models to account for the effect of intermediate principal stress. By replacing the ordinary stress tensor with the transformed stress tensor directly, the Unified Hardening (UH) model is extended to model the anisotropic deformation of soils. Anisotropic Lade's criterion is adopted for shear yield and shear failure in the model. The form of the original model formulations remain unchanged and the model parameters are independent of the loading direction. Good agreement between the experimental results and predictions of the anisotropic UH model is observed.

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Effects of soil fabric on behaviors of granular soils: Microscopic modeling

Cited by 49 publications

References 42 publications

Constitutive modelling of granular materials using a contact normal-based fabric tensor

Constitutive modelling of granular materials using a contact normal-based fabric tensor

Grading-Dependent Behavior of Granular Materials: From Discrete to Continuous Modeling

Anisotropic UH model for soils based on a simple transformed stress method

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