Effects of particle shape on triaxial compression behaviours of realistic ballast particles based on M-A-V-L particle shape evaluation system

Zhao, Lianheng; Deng, Min; Zhang, Shuaihao; Huang, Dongliang; Qiao, Nan; Gong, Jian

doi:10.1007/s10035-022-01288-6

Cited by 7 publications

(3 citation statements)

References 36 publications

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“…This indicator takes into account both the first and second scale particle shape parameters, providing a comprehensive characterization of particle shape. Its reliability has also been verified in previous studies [ 23 ]. The equation of shape coefficient M is shown in Eq ( 1 ): Here, A is the particle surface area and V is the particle volume.…”

Section: Test Schemessupporting

confidence: 72%

“…Previous methods for characterizing the shape of real particles have focused on overall shape, angular features, and surface texture, using multiple shape indicators [ 22 ]. However, these methods do not facilitate establishing a quantitative relationship between particle shape and its physical and mechanical properties [ 23 ]. To address this, this paper proposes the use of a dimensionless indicator M [ 24 ] to characterize the three-dimensional particle shape.…”

Section: Test Schemesmentioning

confidence: 99%

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Spatio-temporal evolution laws of storage coefficient of coal mine underground reservoir and contact network of crushed rock

Qin,

Cao,

Wei

et al. 2023

PLoS ONE

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Spatio-temporal evolution laws of storage coefficient and contact network of crushed rock are of great significance for the construction and utilization of underground reservoirs in coal mines. Based on discrete element method and irregular rigid block model, spatio-temporal evolution laws of storage coefficient and contact network of crushed rock under different overburden stresses are investigated and the following main conclusions are obtained: (1) The average storage coefficient and the storage coefficient at different vertical heights of the crushed rock packing system decrease exponentially as the overburden stress increases. When the overburden stress ranges from 0 to 20 MPa, the average storage coefficient decreases by 48.947%. (2) The average void radius and throat radius of water storage space decrease exponentially as the overburden stress increases. The increase in overburden stress leads to the transformation of large voids into smaller voids, causing a gradual decrease in void connectivity and a tendency towards irregular void shapes. (3) With the increase of overburden stress, the number of strong contacts in the packing system of crushed rock increases and gradually expands from the top to the bottom. The average contact force of crushed rock increases exponentially, while the coordination number increases linearly. (4) As the overburden stress increases, the majority of contact directions are concentrated within the ±30° range in the loading direction. This increase results in an enhancement of the anisotropy of the packing system structure of crushed rock.

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Section: Test Schemessupporting

confidence: 72%

Section: Test Schemesmentioning

confidence: 99%

Spatio-temporal evolution laws of storage coefficient of coal mine underground reservoir and contact network of crushed rock

Qin,

Cao,

Wei

et al. 2023

PLoS ONE

View full text Add to dashboard Cite

show abstract

“…Particle shape plays a crucial role in determining the void distribution law of a particle packing system [25]. To investigate how different shapes of crushed rocks affect the spatial structural characteristics of underground reservoir water storage space in coal mines, it is essential to quantitatively characterize the shape of the crushed rock.…”

Section: Shape Indicators Of Crushed Rockmentioning

confidence: 99%

Spatial Structure Characteristics of Underground Reservoir Water Storage Space in Coal Mines Considering Shape Characteristics of Crushed Rock

Qin,

Cao,

Wei

et al. 2023

Processes

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In order to investigate the impact of a crushed rock shape on the storage coefficient of underground reservoirs in coal mines, statistical analysis of the shape characteristics of crushed rocks was conducted, which was followed by numerical packing tests using the rigid block model. These tests aimed to investigate the spatial structure characteristics of underground reservoir water storage space in coal mines under the influence of different shapes of crushed rock. The results demonstrated the following: (1) Crushed rock exhibits a lognormal distribution in its shape characteristic parameters at different scales with a predominant discoid shape. The shape coefficient M can be utilized as a comprehensive indicator to characterize the shape characteristics of crushed rock. (2) The average storage coefficient of crushed rock increases exponentially as the shape coefficient M increases. There is a 50.1% increase in the storage coefficient from M = 1 to 3.5. (3) The spatial structure of the water storage space exhibits self-similarity, and both the void fractal dimension and the void boundary fractal dimension increase with an increase in the shape coefficient M. (4) When comparing the non-spherical particle system with the spherical particle system, it is observed that the spherical particle system has smaller water storage space, lower connectivity among voids, and more irregular void space. In the non-spherical particle system, the water storage space becomes larger as the shape of crushed rock becomes more irregular, resulting in more irregular void space. However, there is no significant effect on void connectivity.

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An Efficient SPH Framework for Modeling Binary Granular Mixtures and Implications for Granular Flows

Zhang,

Wu,

et al. 2024

Num Anal Meth Geomechanics

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A two‐way coupling numerical framework based on smoothed particle hydrodynamics (SPH) is developed in this study to model binary granular mixtures consisting of coarse and fine grains. The framework employs updated Lagrangian SPH to simulate fine grains, with particle configurations updated at each time step, and total Lagrangian SPH to efficiently model coarse grains without updated particle configurations. A Riemann solver is utilized to introduce numerical dissipation in fine grains and facilitate their coupling with coarse grains. To enhance computational efficiency, a multiple time‐stepping scheme is initially applied to manage the time integration coupling between coarse and fine grains. Several numerical experiments, including granular column collapse, low‐speed impact craters, and granular flow impacting blocks, are conducted to validate the stability and accuracy of the proposed algorithm. Subsequently, two more complex scenarios involving a soil–rock mixture slope considering irregular coarse particle shapes, and bouldery debris flows on natural terrain, are simulated to showcase the potential engineering applications. Finally, a detailed analysis is performed to evaluate the computational efficiency advantages of the present approach. The findings of this study are consistent with previous experimental and numerical results, and the implementation of a multiple time‐stepping scheme can improve computational efficiency by up to 600%, thereby providing significant advantages for large‐scale engineering simulations.

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Effects of particle shape on triaxial compression behaviours of realistic ballast particles based on M-A-V-L particle shape evaluation system

Cited by 7 publications

References 36 publications

Spatio-temporal evolution laws of storage coefficient of coal mine underground reservoir and contact network of crushed rock

Spatio-temporal evolution laws of storage coefficient of coal mine underground reservoir and contact network of crushed rock

Spatial Structure Characteristics of Underground Reservoir Water Storage Space in Coal Mines Considering Shape Characteristics of Crushed Rock

An Efficient SPH Framework for Modeling Binary Granular Mixtures and Implications for Granular Flows

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