Exploring the effect of particle shape caused by erosion on the shear behaviour of granular materials via the DEM

Nie, Zhihong; Fang, Chuanfeng; Gong, Jian; Yin, Zhen‐Yu

doi:10.1016/j.ijsolstr.2020.05.004

Cited by 42 publications

(7 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…But the correlation between roundness and vibratory compaction was not strong. e initial porosity was extracted (shown in Figure 16(b)), and it was found that with the increase of roundness, the initial porosity first decreased and then increased, which was consistent with the previous research results related to particle roundness [27]. Figure 16(c) shows the normalized porosity rate ∆n obtained after conversion using equation (7).…”

Section: E Macroresultsupporting

confidence: 85%

Automated Particle Shape Identification and Quantification for DEM Simulation of Rockfill Materials in Subgrade Construction

Bai¹,

et al. 2022

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

Rockfill materials, conducted by impermeable stone, are frequently used in subgrade construction projects. The irregularity and variability of particle shape are demonstrated to affect the mechanical properties of rockfill subgrade, such as void ratio and coordination number. This study first identifies the subgrade rockfill particle contour by machine learning algorithms, including AdaBoost, Cascade, and sliding windows. Then, the shape evaluation indexes of length flatness, edge angle, and roughness are quantified, and the statistical analysis of each index is presented. In addition, the discrete element method (DEM) simulation is implemented on the compaction of rockfill subgrade to explore the impact of roundness on characteristics of particles. Finally, the macroanalysis on the void ratio and cumulative settlement and the microanalysis on particle coordination number, rotation momentum, and displacement are studied. The results illustrate that roundness has a significant effect on the mechanical characteristics of subgrade rockfill materials. With the increase of rolling passes, the porosity of packing decreases, whereas the settlement increases gradually. The change rate starts fast and ends slowly.

show abstract

Section: E Macroresultsupporting

confidence: 85%

Automated Particle Shape Identification and Quantification for DEM Simulation of Rockfill Materials in Subgrade Construction

Bai¹,

et al. 2022

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

show abstract

“…Figure 15A plots the evolution of SCP in all tests. For both sphere and artificial asperity particles, SCP increases sharply at the initiation of loading and then stabilizes, as noted in previous studies for dense granular materials 61 . The SCP value of the tests with artificial asperity particles is significantly greater than that of the test on spheres.…”

Section: Influence Of Small Surface Asperities On Micro Scale Behaviorsupporting

confidence: 82%

“…The artificial asperities create more contacts for each particle, causing the particles to be more constrained. For the spherical particle sample, the coordination number decreases with loading before reaching a stable value, as reported by existing studies 31,61 . However, for the tests on particles with artificial asperities, only the one with S = 1/3 shows a similar trend of Z evolution, while the Z value of the other tests first decreases and then increases until reaching a stable value.…”

Section: Influence Of Small Surface Asperities On Micro Scale Behaviorsupporting

confidence: 79%

See 1 more Smart Citation

Influence of small particle surface asperities on macro and micro mechanical behavior of granular material

Pan

Zhang

Wang

2022

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

The shape of particles can have a great impact on the mechanical behavior of granular material, which is not only limited to general shape measures such as sphericity and roundness, but also applies for small scale measures such as surface asperities. In this study, triaxial tests on 3D printed particles and DEM tests show that small surface asperities on spherical particles can contribute significantly to the peak strength and dilatancy of granular material, which cannot be reflected by simply altering the traditional contact parameters in DEM. Using polydispersed particles with artificially designed surface asperities in the form of bumps for laboratory and DEM triaxial tests, both macro and micro scale behavior of granular material are analyzed to reveal the influence of these small surface asperities. The result shows that surface asperities can change the coordination number, anisotropy, and normal contact force on the micro scale, increasing the interlocking between particles and restricting particle rotation, which leads to the increase of peak strength and dilatancy on the macro scale. Although the commonly adopted approach of introducing rolling resistance to reflect shape influence can help to enhance the simulation of stress‐strain relationship, especially for particles with relatively small artificial asperities, the micro scale influence of rolling resistance and surface asperities are found to be different as the size of the asperities increase.

show abstract

“…Pue et al (2019) assessed the accuracy of the simulated uniaxial compression with DEM material parameters calibration, and explored the relationship between soil properties and parameters of DEM material. Using the DEM, the effect of particle form induced by erosion (Er) on macroscopic and microscopic behavior was investigated by Nie et al (2020) under triaxial compression tests of granular materials. Syed et al (2017) improved and validated DEM robust calibration methodology.…”

Section: Introductionmentioning

confidence: 99%

Discrete element model calibration based on in situ measurements

Keppler

Bablena

Salman

et al. 2021

View full text Add to dashboard Cite

PurposeTransportation of the measurement samples from their original place to the measurement site causes significant changes in their mechanical properties. The possibility of making in situ measurements helps to create more precise discrete element models.Design/methodology/approachThe possibility of using in situ modified vane shear test based measurement for the calibration of discrete element models is demonstrated in this work.FindingsThe advantage of employing the adjusted vane test is that the values of in situ measurements can be used for the calibration.Originality/valueThe procedure we present allows us to perform accurate discrete element calibration using data from on-site measurements that can be performed quickly and easily.

show abstract

Exploring the effect of particle shape caused by erosion on the shear behaviour of granular materials via the DEM

Cited by 42 publications

References 52 publications

Automated Particle Shape Identification and Quantification for DEM Simulation of Rockfill Materials in Subgrade Construction

Automated Particle Shape Identification and Quantification for DEM Simulation of Rockfill Materials in Subgrade Construction

Influence of small particle surface asperities on macro and micro mechanical behavior of granular material

Discrete element model calibration based on in situ measurements

Contact Info

Product

Resources

About