Discussion of “Description of Inherent and Induced Anisotropy in Granular Media with Particles of High Sphericity” by M. Oboudi, S. Pietruszczak, and A. G. Razaqpur

Wang, Rui; Fu, Pengcheng; Tong, Zhaoxia

doi:10.1061/(asce)gm.1943-5622.0001026

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…ψ is defined as the angle of rotation from the shear plane to the bedding plane, with the rotation direction dictated by the shear direction as shown in Figure and which varies from 0 to 180 degrees as explained by Wang et al . . Figure (a) shows that the amount of peak friction angle variation in the glass beads is, surprisingly, comparable with that in Fujian sand, the grains of which are moderately elongated (Figure (b)).…”

Section: Introductionmentioning

confidence: 54%

Strength anisotropy of granular material consisting of perfectly round particles

Wang

Tong

et al. 2017

Num Anal Meth Geomechanics

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The strength anisotropy of granular materials deposited under gravity has mostly been attributed to elongated particles' tendency to align long axes along the bedding plane direction. However, recent experiments on near‐spherical glass beads, for which preferred particle alignment is inapplicable, have exhibited surprisingly strong strength anisotropy. This study tests the hypothesis that certain amount of fabric anisotropy caused by the anisotropic stress during deposition under gravity can be locked in a circular‐particle deposit. Such locked‐in fabric anisotropy can withstand isotropic consolidation and leads to significant strength anisotropy. 2D discrete element method simulations of direct shear tests on circular‐particle deposits are conducted in this study, allowing for the monitoring of both stress and fabric. Simulations on both monodispersed and polydispersed circular‐particle samples generated under downward gravitational acceleration exhibit clear anisotropy in shear strength, thereby proving the hypothesis. When using contact normal‐based and void‐based fabric tensors to quantify fabric anisotropy in the material, we find that the intensity of anisotropy is discernible but low prior to shearing and is dependent on the consolidation process and the dispersity of the sample. The fact that samples with very low anisotropy intensity measurements still exhibit fairly strong strength anisotropy suggests that current typical contact normal‐based and void‐based second‐order fabric tensor formulations may not be very effective in reflecting the anisotropic peak shear strength of granular materials. Copyright © 2017 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 54%

Strength anisotropy of granular material consisting of perfectly round particles

Wang

Tong

et al. 2017

Num Anal Meth Geomechanics

Self Cite

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“…e peak strength of the rock is the largest when β � 0°or 90°and the smallest when the deposition surface angle is approximately 45°. In contrast, the isotropic criterion is a straight line in the β − q plane [39]; this figure is reproduced from [40]).…”

Section: Rock Triaxial Test Considering Deposition Surfacementioning

confidence: 95%

Formulation of Anisotropic Strength Criterion for Geotechnical Materials

Chen

Wang

Chen

et al. 2020

Advances in Civil Engineering

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A new nonlinear unified strength (NUS) criterion is obtained based on the spatially mobilized plane (SMP) criterion and Mises criterion. New criterion is a series of smooth curves between SMP curved triangle and Mises circle in the π plane and thereby unifies the strength criteria. The new criterion can reflect the effect of the intermediate principal stress and consider the strength nonlinearity of a material. Based on the fabric tensor, the anisotropic parameter A is defined, and the anisotropic equation is proposed and introduced into the NUS criterion to form a nonlinear unified anisotropic strength criterion. The new criterion can be used to predict the strength variation of granular materials and cohesive materials under three-dimensional stress and can present the strength anisotropy of the geomaterials. The validity of the new criterion was checked using rock and soil materials. It is shown that the prediction results for the criterion agree well with the test data.

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Discussion of “Description of Inherent and Induced Anisotropy in Granular Media with Particles of High Sphericity” by M. Oboudi, S. Pietruszczak, and A. G. Razaqpur

Cited by 2 publications

References 9 publications

Strength anisotropy of granular material consisting of perfectly round particles

Strength anisotropy of granular material consisting of perfectly round particles

Formulation of Anisotropic Strength Criterion for Geotechnical Materials

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