Fabric evolution of granular materials along imposed stress paths

Shi, J. L.; Guo, Peijun

doi:10.1007/s11440-018-0665-2

Cited by 45 publications

(15 citation statements)

References 31 publications

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“…It is noted that in some DEM simulations under high pressures [44,61,66], the value of M F for triaxial extension may be even greater than that for triaxial compression. These observations suggest that the shape parameter for M F might be different from that for the critical state stress ratio M [93].…”

Section: Effect Of Shear Mode On the Critical Statementioning

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: Effect Of Shear Mode On the Critical Statementioning

confidence: 99%

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

Yang

et al. 2019

Acta Geotech.

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“…The strong contact ratio is proposed and defined as the ratio of the number of strong contacts to the number of all contacts (sand–sand, sand–rubber, rubber–rubber, and overall contacts). According to Radjai et al [ 51 ] as well as Shi and Guo [ 52 ], the contacts can be divided into strong contacts and weak contacts by the average normal contact force, which is the average value of the normal contact force of all contacts.…”

Section: Resultsmentioning

confidence: 99%

Discrete Element Modelling of the Mechanical Behavior of Sand–Rubber Mixtures under True Triaxial Tests

Liu

Liao

et al. 2020

Materials

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Sand–rubber mixtures (SRMs) consisting of stiff sand particles and soft rubber particles are typical binary mixture materials that possess a variety of complicated properties. The complexity of the properties of sand–rubber mixtures is increased when complex stress path is involved. This study investigates the mechanical behavior of sand–rubber mixtures under generalized loading conditions using the discrete element method. A series of numerical true triaxial shear tests were conducted on pure sand and sand–rubber mixtures. The effect of rubber content and loading path on both of the macroscopic and microscopic performances of sand–rubber mixtures was investigated, and the associated microscale mechanism was also discussed. Numerical simulations show that the relationship between the peak friction angle ϕp and the intermediate principal stress ratio b is influenced by the addition of rubber particles, and a suggested explanation of this phenomenon is that the rubber particles mainly affect the inherent stability of the strong network. Particle-scale observations, including the coordinate number, the proportion of strong contacts, and the fabric anisotropy, are also presented in this study. Microscopic results confirm the explanation above, and explore the force transmission characteristics of sand–rubber mixtures under generalized loading conditions. This research can provide a reference for the constitutive model development of sand–rubber mixtures.

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“…To quantify the microstructure, a second-order fabric tensor [9,11,13,19,20,[25][26][27][28][29][30][31][32] is usually employed, whose deviatoric part has been generally used to describe fabric anisotropy of granular soils.…”

Section: Introductionmentioning

confidence: 99%

Evolution of fabric anisotropy of granular soils: x-ray tomography measurements and theoretical modelling

Zhao

Pinzón

Wiebicke

et al. 2021

Computers and Geotechnics

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Fabric evolution of granular materials along imposed stress paths

Cited by 45 publications

References 31 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

Discrete Element Modelling of the Mechanical Behavior of Sand–Rubber Mixtures under True Triaxial Tests

Evolution of fabric anisotropy of granular soils: x-ray tomography measurements and theoretical modelling

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