A composite particle model for non-spherical particles in DEM simulations

Zhao, Tao; Dai, Feng; Xu, Nuwen; Liu, Y.; Xu, Yongbin

doi:10.1007/s10035-015-0596-7

Cited by 64 publications

(19 citation statements)

References 46 publications

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“…The tests using granular mixture exhibit an intermediate trapping efficiency because the existence of spherical particles can increase the overall mobility of granular flow. The dynamics of particle clumps can match well with the observation in Zhao et al (2015) that the shear resistance of a granular assembly increases with the non-sphericity of the constituent particles.…”

Section: Trapping Efficiencysupporting

confidence: 79%

Discrete element analysis of dry granular flow impact on slit dams

Gong

Zhao

et al. 2020

Landslides

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Slit dam is an open-check barrier structure widely used in mountainous regions to resist the destructive impacts of granular flows. To examine the dynamics of granular flow impact on slit dams, a numerical study by discrete element method (DEM) is presented in this article. The study considers dry granular materials flowing down a flume channel and interacts with slit dams installed at the lower section of the flume. The particle shape is explicitly considered by particle clumps of various aspect ratios. The slit dams are modeled as rigid and smooth rectangular prisms uniformly spaced at in the flume. Four key stages of granular flow impact on the slit dams have been identified, namely, the frontal impact, run up, pile up, and static deposition stages. In the impact process, the kinetic energy of the granular flow is dissipated primarily by interparticle friction and damping. The trapping efficiency of the slit dams decreases exponentially with the relative post spacing, while it increases with the particle clump aspect ratio. The numerical results can provide new insights into the optimization of relative post spacing for slit dam design.

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Section: Trapping Efficiencysupporting

confidence: 79%

Discrete element analysis of dry granular flow impact on slit dams

Gong

Zhao

et al. 2020

Landslides

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“…ratio of maximum to minimum length) and found that the angle of shearing resistance decreases as the particle elongation increases for samples with the same initial density. Zhao et al [14] used a composite (clumped) particle model to create non-spherical particles and demonstrated that particle shape increased resistance to compaction. Kumari and Sitharam [15] studied the effect of particle aspect ratio on the monotonic shear behavior, but their study was limited to granular assemblies with only two aspect ratios but it must be highlighted that the particle grading of these DEM specimens was not unique.…”

Section: Introductionmentioning

confidence: 99%

The influence of particle geometry and the intermediate stress ratio on the shear behavior of granular materials

et al. 2017

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The behavior of granular materials is very complex in nature and depends on particle shape, stress path, fabric, density, particle size distribution, amongst others. This paper presents a study of the effect of particle geometry (aspect ratio) on the mechanical behaviour of granular materials using the Discrete Element Method (DEM). This study discusses 3D DEM simulations of conventional triaxial and true triaxial tests. The numerical experiments employ samples with different particle aspect ratios and a unique particle size distribution (PSD). Test results show that both particle aspect ratio (AR) and intermediate stress ratio (b=(σ2'-σ3')/(σ1'-σ3')) affect the macroand micro-scale responses. At the macro-scale, the shear strength decreases with an increase in both aspect ratio and intermediate stress ratio b values. At the micro-scale level, the fabric evolution is also affected by both AR and b. The results from DEM analyses qualitatively agree with available experimental data. The critical state behaviour and failure states are also discussed. It is observed that the position of the critical state loci in the compression (e-p') space is only slightly affected by aspect ratio (AR) while the critical stress ratio is dependent on both AR and b. It is also demonstrated that the influence of the aspect ratio and the intermediate stress can be captured by micro-scale fabric evolutions that can be well understood within the framework of existing critical state theories. It is also found that for a given stress path, a unique critical state fabric norm is dependent on the particle shape but is independent of critical state void ratio.

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“…It is shown that QH-E lunar soil simulant is of angular shape with sharp corners and a highly irregular surface because of the Raymond mill method used to grind QH-E [24]. In the tri-axial compression tests, the irregular particle shape can increase the shear strength [11,30]. Therefore, the simulated values of peak deviatoric stress, residual stress and axial strain at peak stress are slightly smaller than those of experimental results.…”

Section: Tab 1 -Parameters For Pfc Tri-axial Compression Numerical Smentioning

confidence: 94%

Discrete Element Modeling of Strength Properties and Failure Modes of Qh-E Lunar Soil Simulant at Low Confining Stresses

Li¹,

Zou²,

Wu³

et al. 2018

CEJ

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In this paper, discrete element method (DEM) is used to investigate the strength properties and failure modes of QH-E lunar soil simulant at the low confining stress. The deviator stress-axial strain curves and volumetric strain-axial strain curves are obtained based on DEM simulations, which are basically consistent with the experimental results at the low confining stresses, and the lower confining stress is, the closer to the experimental curves will obtain. Moreover, for a given low confining stress, the effects of porosity and friction coefficient on strength properties of QH-E samples are discussed. The results show that the peak stress, residual stress and axial strain corresponding to the peak stress obviously decrease with the increase of the porosity, while slightly increase with the increase of the friction coefficient. Furthermore, the whole failure processes and failure modes at different low confining stresses are also observed by DEM simulations. The simulated results indicate that the V-type shear zone (double shear bands) is the main failure mode at the low confining stress, and then the V-type shear zone gradually changes to a single shear band (along the horizontal direction about 52 o) with the increase of the confining stress.

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A composite particle model for non-spherical particles in DEM simulations

Cited by 64 publications

References 46 publications

Discrete element analysis of dry granular flow impact on slit dams

Discrete element analysis of dry granular flow impact on slit dams

The influence of particle geometry and the intermediate stress ratio on the shear behavior of granular materials

Discrete Element Modeling of Strength Properties and Failure Modes of Qh-E Lunar Soil Simulant at Low Confining Stresses

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