Stress-chain based micromechanics of sand with grain shape effect

Maeda, Kenichi; Sakai, Hirotaka; Kondo, Akimasa; Yamaguchi, Tomoyo; Fukuma, Masatoshi; Nukudani, Emi

doi:10.1007/s10035-010-0208-5

Cited by 73 publications

(28 citation statements)

References 26 publications

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“…Thornton, 2000;Sitharam & Vinod, 2008;Salot et al, 2009), although in some studies (e.g. Wood & Maeda, 2008;Maeda et al, 2010) the critical state coordination number was shown to increase with stress, in contrast to the observation here, which suggests a unique value independent of stress level. However, none of the aforementioned studies considered particle crushing.…”

Section: Coordination Numbercontrasting

confidence: 98%

Micro mechanics of drained and undrained shearing of compacted and overconsolidated crushable sand

Bono

McDowell

2017

Géotechnique

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A numerical crushable soil sample has been created using the authors' previously published model and subjected to a range of stress paths. Compacted sand simulations are performed using conventional triaxial stress paths, constant mean stress and constant-volume conditions and a critical state line is established. Overconsolidated samples have been created by crushing the soil down the isotropic normal compression line, unloading and shearing at constant radial stress, constant mean stress or constant volume, and a critical state line is again established. The critical state line is unique at high stresses for the simulated compacted and overconsolidated sands and is parallel to the isotropic normal compression line, in agreement with available data and a previously published theory. The critical state line at low stress levels is non-unique and a function of the particle size distribution, in agreement with available data. Constant-volume tests exhibit the well-known phenomena of phase transformation points and peak strengths are observed for 'drained' soils on the dense side of critical. The numerical soil produces a state boundary surface that compares well to available data.

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Section: Coordination Numbercontrasting

confidence: 98%

Micro mechanics of drained and undrained shearing of compacted and overconsolidated crushable sand

Bono

McDowell

2017

Géotechnique

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“…The top and bottom boundaries moved vertically as loading platens under straincontrolled conditions to simulate the confining pressure p. The loading speed was slow enough (10 mm/s) to ensure the test was conducted under quasi-static conditions. Different methods can be used to model irregularlyshaped grains [3,12,17,25,26]. In our method, each granular assembly was prepared by putting clusters of spheres of a random radius according to the grain distribution curve by Fig.…”

Section: Discrete Modelmentioning

confidence: 99%

“…To resemble the real grain shape (roughness), two main approaches are usually used: 1) contact moments between rigid spheres or disks are assumed ( [5,16,18,21,28,44]) or 2) clusters of combined discrete elements that form irregularly-shaped grains are introduced [12,25,26,29,35,48].…”

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confidence: 99%

Effect of grain roughness on strength, volume changes, elastic and dissipated energies during quasi-static homogeneous triaxial compression using DEM

2012

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A quasi-static homogeneous drained triaxial compression test on cohesionless sand under constant lateral pressure was simulated using a three-dimensional DEM model. Grain roughness was modelled by means of symmetric clusters composed of rigid spheres imitating irregular particle shapes. The effect of grain roughness on shear strength, dilatancy, kinetic, elastic and dissipated energies was numerically analyzed. Some numerical results were compared with available experimental results.

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“…However, some important issues still remain unclear such as the effect of the particle-level properties (shape and friction) on the structure and the mechanical responses of jammed granular packings [25][26][27][28][29][30]. In this work, we aim to elucidate the role of the particle shape on the rigidity of a granular solid within the framework of effective medium theories based on the Hertzian-Mindlin contact law via the coordination number Z [12,17,31].…”

Section: Introductionmentioning

confidence: 99%

Probing the effect of particle shape on the rigidity of jammed granular solids with sound speed measurements

2015

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We describe a precise phase velocity measurement of longitudinal sound waves in granular solids under stress. We observe an important difference of the phase velocity between the packings of glass beads and sand particles, which is likely due to the interlocking effect caused by the particle shape. This effect can be captured by the contact coordination number using the effective medium theory. We also investigate the change of this coordination number in dry and wet granular packings, caused by cyclic loading or nonlinear sound transmission. These acoustic measurements show that the particle-level properties such as shape and friction significantly influence the response of jammed granular solids to external driving.

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Stress-chain based micromechanics of sand with grain shape effect

Cited by 73 publications

References 26 publications

Micro mechanics of drained and undrained shearing of compacted and overconsolidated crushable sand

Micro mechanics of drained and undrained shearing of compacted and overconsolidated crushable sand

Effect of grain roughness on strength, volume changes, elastic and dissipated energies during quasi-static homogeneous triaxial compression using DEM

Probing the effect of particle shape on the rigidity of jammed granular solids with sound speed measurements

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