Size effect on contact behavior in DEM simple shear tests

Li, Yao; Li, Jiaping; Zhu, Tantan; Han, Kuan

doi:10.1038/s41598-021-99473-9

Cited by 6 publications

(5 citation statements)

References 26 publications

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“…In geotechnical engineering, the particle size has a significant influence on ground behavior. It was assumed to exhibit the same behavior in the DEM simulations 22 . Therefore, the effect of the discrete element particle size ratio (change in porosity) on the ballast stiffness was evaluated.…”

Section: Ballasted Track Analysis Modelmentioning

confidence: 99%

Simplified DEM-based Modelling and Simulation of the Track ballast

Lee,

Song,

Lim

et al. 2023

Preprint

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This study proposes a rational method for modelling ballast in tracks based on the Discrete Element Method (DEM) approach. To simulate a ballast consisting of a group of gravels, it is effective to use the discrete element method. The ballast comprises randomly arranged gravels of unspecified shapes, and requires multiple steps and a separate house code for implementing the ballast. In this study, a simplified ballast analysis model using the Parallel Bond Method (PBM) is proposed and verified through comparison with design standards. Additionally, case studies are conducted to investigate the effect of particle size distribution and micromechanical parameters on the simulation results.

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Section: Ballasted Track Analysis Modelmentioning

confidence: 99%

Simplified DEM-based Modelling and Simulation of the Track ballast

Lee,

Song,

Lim

et al. 2023

Preprint

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show abstract

“…In geotechnical engineering, the particle size has a significant influence on ground behavior. It was assumed to exhibit the same behavior in the DEM simulations [24]. A gravel ballast is formed by the interlocking of countless gravels.…”

Section: Verification Of Track Stiffnessmentioning

confidence: 99%

Simplified DEM-Based Modelling and Simulation of the Track Ballast

Kwon,

Song,

Lim

et al. 2023

Buildings

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This study proposes a rational method for modelling ballast in tracks based on the discrete element method (DEM) approach. To simulate a ballast consisting of a group of gravels, it is essential to use the discrete element method. The ballast comprises randomly arranged gravels of unspecified shapes, and requires multiple steps and a separate house code for implementing the ballast. In this study, a simplified ballast analysis model using the parallel bond method (PBM) is proposed and verified through comparison with design standards. Additionally, case studies are conducted to investigate the effect of particle size distribution and micromechanical parameters on the simulation results.

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“…In equation (10), an amplitude parameter is obtained according to any one of the two planes that can be used to describe the transverse isotropy of natural soil, and the amplitude parameter value can be obtained by equation (12). In equation (10), if θ (k) 1 � π/2 in equation ( 6) and α (k) = 0 in equation ( 8), then a 1 = a 3 . Equation (10) has degenerated into the transversely isotropic form.…”

Section: Definition Of Amplitude Parameters Of Orthogonal Planesmentioning

confidence: 99%

“…In equation (10), if θ (k) 1 � π/2 in equation ( 6) and α (k) = 0 in equation ( 8), then a 1 = a 3 . Equation (10) has degenerated into the transversely isotropic form.…”

Section: Definition Of Amplitude Parameters Of Orthogonal Planesmentioning

confidence: 99%

“…Fabric tensor is a great connection tool for granular materials, and quantitative description is helpful in revealing the in uence of microscopic fabric on macroscopic mechanical properties [10]. Since Oda et al [11][12][13] put forward the de nition of fabric tensors, the study on the mechanical properties of granular materials has gone from macroscopic to microscopic, and several constitutive models and strength criteria based on fabric tensors have been established.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

3D Mechanical Characters and Their Fabric Evolutions of Granular Materials by DEM Simulation

Yangyang

2022

Mathematical Problems in Engineering

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To quantitatively describe the influence of the contact characteristics of granular materials on their mechanical response, the true-triaxial tests with different particle shapes are simulated by the discrete element method (DEM), and the connection between the evolutions of particle contact fabric and the anisotropic mechanical responses is studied. The contact normal vector of the particle in 3D space is described by two independent angles, by which the contact fabric tensor is defined. The amplitude parameters in three orthogonal directions are defined by the invariants of the plane fabric tensor, which are scalars and describe the degree of anisotropy of the contact fabric in each plane. The expression of orthotropic fabric tensor is derived from the amplitude parameters, with the change of geometric space of contact normal vector, which is reduced to the different tensor of transverse isotropic naturally. The fabric tensor can be directly applied to the constitutive equation to describe the effects of the particle contact on the mechanical response. For verifying the rationality of contact characteristics described by fabric tensor, four particle shapes are clumped by PFC3D. The mechanical properties of specimens with different particles are simulated under the true-triaxial loading path, and the data of contact normal vector is extracted in real time. The simulation results showed that the particle shapes have a significant effect on the 3D stress-strain relationship and strength, which showed apparent anisotropy, and the invariants of fabric tensor can be used to describe the evolution of particle contact in the loading process.

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Size effect on contact behavior in DEM simple shear tests

Cited by 6 publications

References 26 publications

Simplified DEM-based Modelling and Simulation of the Track ballast

Simplified DEM-based Modelling and Simulation of the Track ballast

Simplified DEM-Based Modelling and Simulation of the Track Ballast

3D Mechanical Characters and Their Fabric Evolutions of Granular Materials by DEM Simulation

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