The signature of shear-induced anisotropy in granular media

Guo, Ning; Zhao, Jidong

doi:10.1016/j.compgeo.2012.07.002

Cited by 441 publications

(183 citation statements)

References 48 publications

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“…DEM simulations can capture the features of soil behaviour described by the critical state framework: researchers including Ng (2009), Yan & Dong (2011), Guo & Zhao (2013) and Huang et al (2014b) have confirmed that DEM simulations can give a critical state locus, while Hanley et al (2015) and Ciantia et al (2015) have confirmed that DEM simulations of crushable particles can generate a normal compression line. Although DEM has been widely adopted 3 by the soil mechanics community since its inception (O'Sullivan, 2014), energy is not routinely tracked in DEM simulations of quasi-static monotonic tests.…”

Section: Introductionmentioning

confidence: 93%

Energy dissipation in soil samples during drained triaxial shearing

2018

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The discrete element method was used to simulate drained triaxial compression of large-scale, polydisperse numerical samples at a range of void ratios while tracing all relevant energy components.The frictional dissipation and boundary work are almost equal regardless of sample density. The volumetric work reaches a steady value at large strain. However, the distortional work increases continually as sample deformation continues post-critical state. There is a preferential orientation for frictional dissipation at around 45° to the major principal stress direction. This matches the orientation at which there is the largest number of sliding contacts. The work equations, which are fundamental in most commonly used constitutive models, are linear when plotted against deviatoric strain. The Modified Cam Clay work equation substantially over-predicts the frictional dissipation for dense samples. An alternative, thermodynamically-consistent work equation gives a much better description of frictional dissipation and is therefore recommended to ensure accuracy in modelling.

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Section: Introductionmentioning

confidence: 93%

Energy dissipation in soil samples during drained triaxial shearing

2018

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“…DEM respects the discrete nature of granular media and models the material system as an assembly of interacted individual particles. Based often on rather simple contact law at microscopic level, DEM has been demonstrated to be capable of capturing many salient macroscopic features of granular media and meanwhile providing interesting insights into the evolution of the associated internal micro-structures [6,7,8,9].…”

Section: Introductionmentioning

confidence: 99%

A hierarchical model for cross-scale simulation of granular media

Guo¹,

Zhao²

2013

AIP Conference Proceedings

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Abstract. This paper presents a multiscale modeling framework for granular media based on a hierarchical cross-scale approach. The overall material is treated as a continuum on the macroscale and the corresponding boundary value problem is solved by ¿nite element method (FEM). At each Gauss point of the FEM mesh, a discrete element assembly is embedded from which the material behavior is obtained for the global FEM computation. It is demonstrated that this technique may capture the salient macroscopic behavior of granular media in a natural manner, and meanwhile helps to bypass the conventional phenomenological nature of continuum modeling approaches. Moreover, the framework provides us with rich information on the particle level which can be closely correlated to the macroscopic material response and hence helps to shed lights on the cross-scaling understanding of granular media. Speci¿c linkages between the microscopic origins and mechanisms and the macroscopic responses can be conveniently developed. As a demonstrative example, the strain localization of granular sand in biaxial compression test is investigated by the multiscale approach to showcase the above features.

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“…However, the prevailing purely phenomenological approaches have largely failed to attain this goal. Active attempts have recently been diverted to identify the key microstructures and micromechanisms that act as difference makers for the varied macroscopic responses under different loading conditions to be used in modern constitutive modeling [8,[14][15][16][17][18][19][20][21][22][23]. The signature of the microstructure of granular media under cyclic loads has been and still is an issue of particular interest.…”

Section: Signatures Of Fabric and Fabric Evolutionmentioning

confidence: 99%

Micro origins for macro behavior in granular media

et al. 2016

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We report the latest advances in understanding, characterization and modeling of key micro mechanisms and origins underpinning the interesting and complex macroscopic behavior of granular matter. Included in this Topical Collection are novel theories, innovative experimental tools and new numerical approaches, focusing primarily on three subtopics governing important multiscale properties of granular media: (a) the jamming transition from fluid-to solid-like behavior, critical state flow and wave propagation, (b) the signature of fabric and its evolution for granular media under general loading conditions, and (c) mechanisms like rotation, breakage, failure and aggregation. The significance of these contributions and exploratory future directions pertaining to cross-scale understanding of granular matter are discussed.

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The signature of shear-induced anisotropy in granular media

Cited by 441 publications

References 48 publications

Energy dissipation in soil samples during drained triaxial shearing

Energy dissipation in soil samples during drained triaxial shearing

A hierarchical model for cross-scale simulation of granular media

Micro origins for macro behavior in granular media

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