Investigating the effects of Fourier-based particle shape on the shear behaviors of rockfill material via DEM

Nie, Zhihong; Zhu, Yangui; Wang, Xiang; Gong, Jian

doi:10.1007/s10035-019-0875-9

Cited by 41 publications

(13 citation statements)

References 59 publications

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“…Finally, a f t also increases with μ s (see Fig. 9), showing that the stability of force chains is built upon an increasing mobilization of friction forces (in fact, a f t ∝ | f t | / f n [24,50]). In contrast, the evolution of anisotropy with α is more complex as it also depends on μ s .…”

Section: B Texture and Anisotropymentioning

confidence: 87%

“…Our numerical samples were composed of N p = 10000 particles placed in a rectangular box bounded by frictionless walls, with density ρ and with diameters (i.e., circumscribed circles) d varying between d min = 0.8d max and d max , with a uniform distribution of particle volume fractions (i.e., each size class occupies the same volume in the sample), where d max is the maximum diameter. A set of 11 different packings was prepared, each composed of particles having the same number of sides: one packing of disks and 10 packings with n s ∈ [50,30,20,10,8,7,6,5,4,3]. In other words, the angularity of the particles, defined as α = 2π/n s , varied from 0 (disks) to 2π/3 (triangles).…”

Section: B Packing Construction and Biaxial Testsmentioning

confidence: 99%

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Combined effects of contact friction and particle shape on strength properties and microstructure of sheared granular media

et al. 2020

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We present a systematic numerical investigation concerning the combined effects of sliding friction and particle shape (i.e., angularity) parameters on the shear strength and microstructure of granular packings. Sliding friction at contacts varied from 0 (frictionless particles) to 0.7, and the particles were irregular polygons with an increasing number of sides, ranging from triangles to disks. We find that the effect of local friction on shear strength follows the same trend for all shapes. Strength first increases with local friction and then saturates at a shape-dependent value. In contrast, the effect of angularity varies, depending on the level of sliding friction. For low friction values (i.e., under 0.3), the strength first increases with angularity and then declines for the most angular shapes. For high friction values, strength systematically increases with angularity. At the microscale, we focus on the connectivity and texture of the contact and force networks. In general terms, increasing local friction causes these networks to be less connected and more anisotropic. In contrast, increasing particle angularity may change the network topology in different directions, directly affecting the macroscopic shear strength. These analyses and data constitute a first step toward understanding the joint effect of local variables such as friction and grain shape on the macroscopic rheology of granular systems.

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Section: B Texture and Anisotropymentioning

confidence: 87%

Section: B Packing Construction and Biaxial Testsmentioning

confidence: 99%

Combined effects of contact friction and particle shape on strength properties and microstructure of sheared granular media

et al. 2020

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“…e shape of rockfill particle is usually irregular and stochastic. In recent years, significant efforts have been made to model realistic particle shape of rockfill particles by DEM [28][29][30]. To consider the effect of particle shape, convex polygonal particles from circles are generated to reflect the complex geometric features of rockfill particles in this paper (see Figure 2), which is similar to the method adopted by Zhou et al [29].…”

Section: Discrete Modeling Of Field Rockfillmentioning

confidence: 99%

Discrete Simulation of Vibratory Roller Compaction of Field Rockfills

Cheng-xue

2021

Shock and Vibration

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Vibratory roller compaction is a well-known method in improving the mechanical properties of field rockfills. However, the meso mechanism of rockfill densification under vibratory roller compaction has not been understood clearly. This paper presents a discrete numerical method to simulate the vibratory roller compaction of field rockfills. Firstly, rockfill particles were modeled by irregular and stochastic clusters, which can be breakable. In addition, the segregation of field rockfills was replicated in a practical manner. Then, a new model of the vibratory roller was presented, in which the frame inertia was considered. Finally, the developed method was applied to simulate the vibratory roller compaction of field rockfills in the Shui Buya Project. Results show that (1) the numerical simulations of vibratory roller compaction of field rockfills agree well with the field experiments; thus, the feasibility and rationality of the developed simulation method are verified; (2) the dynamic response of field rockfills under vibratory roller compaction can be predicted by the presented numerical method with calibrated model and parameters; (3) the new roller model with frame inertia considered is much more accurate than the roller models in early studies. Thus, the developed discrete numerical method can be further adopted to explore the meso mechanism of rockfill densification under vibratory roller compaction in the future.

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“…Consequently, the DEM can introduce cohesive forces, such as van der Waals force (Sakai et al, 2012) and liquid bridge force (Dhenge et al, 2013;Tsunazawa et al, 2016;Chan and Washino, 2018;Schmelzle and Nirschl, 2018;Sun and Sakai, 2018;Sakai et al, 2019). Very recently, modeling of the particle shape has been extensively studied in the DEM (Zhou et al, 2011;Govender et al, 2019;Kafashan et al, 2019;Nie et al, 2019;Shrestha et al, 2019;Yang et al, 2019). In contrast, the continuum media have been simulated using the SPH and the MPS methods, which have been consistently employed in the computation of free surface fluid flows, such as droplet impingement (Xiong et al, 2010(Xiong et al, , 2011, free surface fluid flow through porous media (Sun et al, 2019), discharge of highly viscous fluid flow (Sun et al, 2012), and wave migration (Shibata et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Recent Progress on Mesh-free Particle Methods for Simulations of Multi-phase Flows: A Review

Sakai

Mori

Sun

et al. 2020

KONA

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The discrete element method (DEM) and the moving particle semi-implicit (MPS) method are the most popular mesh-free particle methods in the discontinuum and continuum. This paper describes a state-of-the-art modeling on multi-phase flows using these mesh-free particle methods. Herein, a combinational model of the signed distance function (SDF) and immersed boundary method (IBM) is introduced for an arbitrary-shaped wall boundary in the DEM simulation. Practically, this model uses a simple operation to create the wall boundary. Although the SDF is a scalar field for the wall boundary of the DEM, it is useful for the wall boundary of the CFD through combination with the IBM. Validation tests are carried out to demonstrate the adequacy of the SDF/IBM wall boundary model. Regarding the mesh-free particle method for continuum, the phase change problem is one of the challenging topics, as the solid state is usually modeled by extremely high viscous fluid in the phase change simulation. The phase change simulation is shown to be efficiently performed through an implicit algorithm and a heat flux model in the MPS method. The adequacy of these models is verified by the numerical examples.

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Investigating the effects of Fourier-based particle shape on the shear behaviors of rockfill material via DEM

Cited by 41 publications

References 59 publications

Combined effects of contact friction and particle shape on strength properties and microstructure of sheared granular media

Combined effects of contact friction and particle shape on strength properties and microstructure of sheared granular media

Discrete Simulation of Vibratory Roller Compaction of Field Rockfills

Recent Progress on Mesh-free Particle Methods for Simulations of Multi-phase Flows: A Review

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