Experimental investigation of shear strength of sands with inherent fabric anisotropy

Tong, Zhaoxia; Fu, Pengcheng; Zhou, Shengjun; Dafalias, Yannis F.

doi:10.1007/s11440-014-0303-6

Cited by 93 publications

(43 citation statements)

References 37 publications

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“…However, 2D and 3D particles share many common microscopic mechanisms, particularly those related to particle interactions, which govern macroscopic behavior of granular materials in 2D and 3D alike. The fact that ''A-class predictions'' made using DEM [11] have been validated in later experimental observations [32] on actual sand samples provides strong confidence in 2D DEM's capabilities in qualitatively capturing behaviors of sand.…”

Section: Introductionmentioning

confidence: 73%

DEM study of fabric features governing undrained post-liquefaction shear deformation of sand

et al. 2016

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In an effort to study undrained post-liquefaction shear deformation of sand, the discrete element method (DEM) is adopted to conduct undrained cyclic biaxial compression simulations on granular assemblies consisting of 2D circular particles. The simulations are able to successfully reproduce the generation and eventual saturation of shear strain through the series of liquefaction states that the material experiences during cyclic loading after the initial liquefaction. DEM simulations with different deviatoric stress amplitudes and initial mean effective stresses on samples with different void ratios and loading histories are carried out to investigate the relationship between various mechanics-or fabric-related variables and postliquefaction shear strain development. It is found that wellknown metrics such as deviatoric stress amplitude, initial mean effective stress, void ratio, contact normal fabric anisotropy intensity, and coordination number, are not adequately correlated to the observed shear strain development and, therefore, could not possibly be used for its prediction. A new fabric entity, namely the Mean Neighboring Particle Distance (MNPD), is introduced to reflect the space arrangement of particles. It is found that the MNPD has an extremely strong and definitive relationship with the post-liquefaction shear strain development, showing MNPD's potential role as a parameter governing post-liquefaction behavior of sand.

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Section: Introductionmentioning

confidence: 73%

DEM study of fabric features governing undrained post-liquefaction shear deformation of sand

et al. 2016

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“…In previous work, direct shear tests have been applied by a number of researchers to study the mechanical behavior of granular soils. Tong, Fu, Zhou, & Dafalias (2014) studied the influence of initial anisotropy and particle shape on the shear strength of various sands using modified direct shear apparatus. For wellgraded sand-gravel mixtures, Hamidi, Azini, and Masoudi (2012) studied the impact of gradation on the volume change and the shear strength of various mixtures.…”

Section: Introductionmentioning

confidence: 99%

An insight into the mechanical behavior of binary granular soils

2015

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“…The notion that granular materials consisting of largely spherical particles do not exhibit significant strength anisotropy has been further challenged by some recent laboratory experiments . Figure shows the variation of peak shear strength with respect to the direction of shearing relative to the bedding plane for two materials tested by Tong et al .…”

Section: Introductionmentioning

confidence: 99%

“…Figure shows the variation of peak shear strength with respect to the direction of shearing relative to the bedding plane for two materials tested by Tong et al . . In that work, ‘strength’ is embodied in the peak friction angle.…”

Section: Introductionmentioning

confidence: 99%

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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Experimental investigation of shear strength of sands with inherent fabric anisotropy

Cited by 93 publications

References 37 publications

DEM study of fabric features governing undrained post-liquefaction shear deformation of sand

DEM study of fabric features governing undrained post-liquefaction shear deformation of sand

An insight into the mechanical behavior of binary granular soils

Strength anisotropy of granular material consisting of perfectly round particles

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