Particle Crushing and Deformation Behaviour

Kikumoto, Mamoru; Wood, D. Muir; Russell, Adrian R.

doi:10.3208/sandf.50.547

Cited by 156 publications

(58 citation statements)

References 24 publications

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“…Hence the location of drained CSL is directly associated with the compaction energy level adopted, that is, the position moves towards the smaller void ratios for larger compaction energy levels. Similar observations have been reported for sands prepared with different initial grading (Kikumoto et al, 2010) and by past numerical studies conducted by Wood and Maeda (2008).…”

Section: Stress-strain Behaviour and Associated Breakagesupporting

confidence: 77%

Drained and Undrained Shear Behavior of Compacted Coal Wash

Heitor

Indraratna

Kaliboullah

et al. 2016

J. Geotech. Geoenviron. Eng.

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Coal wash is a granular waste material that is readily available in the vicinity of coal mining operations. While its potential use in structural fills has been recognized in the past, the effects of particle breakage on the geomechanical performance of the material have not been thoroughly investigated. In this paper, an experimental study on a selected coal wash is undertaken to characterize the influence of compaction and particle breakage on its corresponding stress-strain behavior. Particular emphasis is given to the role of compaction energy level and associated breakage incurred during compaction on the drained and undrained shearing behavior. The incidence of particle breakage for undrained and drained shearing was observed to be different, which in turn had a strong influence in the yielding behavior and the critical state. Furthermore, the critical state conditions for coal wash seem to be better described through a three-dimensional surface incorporating the effect of breakage. AbstractCoalwash is a granular waste material that is readily available in the vicinity of coal mining operations. While its potential use in structural fills has been recognised in the past, the effects of particle breakage on the geomechanical performance of the material have not been thoroughly investigated. In this paper, an experimental study on a selected coalwash is undertaken to characterize the influence of compaction and particle breakage on its corresponding stress-strain behaviour.Particular emphasis is given to the role of compaction energy level and associated breakage incurred during compaction on the drained and undrained shearing behaviour. The incidence of particle breakage for undrained and drained shearing was observed to be different, which in turn had a strong influence in the yielding behaviour and the critical state. Furthermore, the critical state conditions for coalwash seem to be better described through a three dimensional surface incorporating the effect of breakage. CE Database subject headings: coalwash; compaction; particle breakage; undrained and drained shear behaviour 23

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Section: Stress-strain Behaviour and Associated Breakagesupporting

confidence: 77%

Drained and Undrained Shear Behavior of Compacted Coal Wash

Heitor

Indraratna

Kaliboullah

et al. 2016

J. Geotech. Geoenviron. Eng.

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“…Crushing models used in DEM are by necessity a significant simplification of reality and affect the position of the critical state line in − log ( ′ ) space (Kikumoto et al, 2010). Every parameter in the model has a clear physical basis.…”

Section: Introductionmentioning

confidence: 99%

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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“…Numerical models of such problems might not be sufficiently accurate if grain fragmentation is ignored. Grain size evolution can be incorporated into continuum constitutive models using suitable formulations (Kikumoto et al, 2010;Zhang et al, 2013), but it can also be modelled using the discrete-element method (DEM).…”

Section: Introductionmentioning

confidence: 99%

An approach to enhance efficiency of DEM modelling of soils with crushable grains

Ciantia¹,

Arroyo²,

Calvetti³

et al. 2015

Géotechnique

181

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In this study oedometric compression tests of hydrocarbon coke, Fontainebleau sand and silica sand are simulated in three dimensions using breakable particles. The method adapts a rigorous breakage criterion for elasto-brittle spheres to represent failure of grains isolated between platens or within granular masses. The breakage criterion allows for the effect of particle bulk and contact properties to be treated separately. A discrete fragmentation multigenerational approach is applied as a spawning procedure. The number of particles quickly increases during the simulation, but is kept manageable by systematic fine exclusion and upscaling. Fine exclusion leads to mass losses between generations, but that loss is accounted for outside the mechanical model. Sensitivity analysis shows that it is enough to keep 53% of the crushed particle mass within the mechanical model to correctly reproduce experimental macroscopic behaviour. Practical upscaling rules are proposed for (a) contact stiffness, (b) breakage criteria and (c) grain size distribution, and validated simulating the same test, reducing by half the initial number of particles. The results are promising as both the mechanical and grading evolution are well captured with two orders of magnitude savings in computing efficiency.

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Particle Crushing and Deformation Behaviour

Cited by 156 publications

References 24 publications

Drained and Undrained Shear Behavior of Compacted Coal Wash

Drained and Undrained Shear Behavior of Compacted Coal Wash

Energy dissipation in soil samples during drained triaxial shearing

An approach to enhance efficiency of DEM modelling of soils with crushable grains

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