Experimental and numerical investigation on size effect on crushing behaviors of single calcareous sand particles

Kuang, Dumin; Long, Zhilin; Guo, Ruiqi; Yu, Piao-yi

doi:10.1080/1064119x.2020.1725194

Cited by 33 publications

(8 citation statements)

References 30 publications

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“…Particle carrying capacity can be measured by the maximum loading force [40][41][42]. In this work, the average loading force F ca is selected to represent particle carrying capacity:…”

Section: Stress and Carrying Capacitymentioning

confidence: 99%

“…In order to simulate the size effect of particles, Lim et al [39] proposed a method, in which the original flaws can be produced by deleting 0% to 25% elementary balls randomly. Wang et al [40] and Kuang et al [41,42] reproduced the distribution of single-particle strength based on Lim's method and investigated the relationship between particle strength and coordination number, while in fact, the inner porosity of most granular materials is less than 5%, and the introduction of original flaws by removing elementary balls will result in a statistical deviation of both void ratio and equivalent fragment diameter in DEM simulations. Therefore, the rationality of deleting elementary balls deserves further discussing.…”

Section: Introductionmentioning

confidence: 99%

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DEM Analysis of Single-Particle Crushing Considering the Inhomogeneity of Material Properties

Zhang

Huang

2021

Acta Mech. Solida Sin.

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Crushing characteristics of single particles are the basis of granular material simulation with discrete element method (DEM). To improve the universality and precision of crushable DEM model, inhomogeneous stiffness and strength properties are introduced into the bonded particle method, with which the Weibull distribution and size effect of particle strength can be reproduced without deleting elementary balls. The issues of particle strength and carrying capacity under complex contact conditions are investigated in this work by symmetric loading tests, asymmetric loading tests, and ball–ball loading tests. Results of numerical experiments indicate that particle carrying capacity is significantly influenced by coordination numbers, the symmetry of contact points, as well as the relative size of its neighbors. Contact conditions also show impact on single-particle crushing categories and the origin position of inner particle cracks. The existing stress indexes and assumptions of particle crushing criterion are proved to be inappropriate for general loading cases. Both the inherent inhomogeneity and contact conditions of particles should be taken into consideration in the simulation of granular materials.

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“…Particle carrying capacity can be measured by the maximum loading force [40][41][42]. In this work, the average loading force F ca is selected to represent particle carrying capacity:…”

Section: Stress and Carrying Capacitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

DEM Analysis of Single-Particle Crushing Considering the Inhomogeneity of Material Properties

Zhang

Huang

2021

Acta Mech. Solida Sin.

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“…The shear characteristics of calcareous sand have been extensively studied; it has been observed that particle gradation (Hassanlourad et al, 2014;Rezvani et al, 2021), confining pressure (Fahey, 2021), and particle breakage (Jingping et al, 1997;Zhang and Luo, 2020) have an impact on the shear strength of calcareous sand. For particle gradation, significant attention has been paid to the influence of particle size (Bagherzadeh-Khalkhali and Mirghasemi, 2009;Cao et al, 2020;Kuang et al, 2021), uniformity coefficient (Liang et al, 2022), average particle size (Giang et al, 2017;Wang et al, 2017b), fine particle content (Shen et al, 2021), and particle group content (Ata et al, 2018;Shen et al, 2018;Yang et al, 2020;Fan et al, 2021) on the shear strength of calcareous sand. Chen et al (2022) carried out triaxial shear tests to study the effect of gradation on the particle breakage and mechanical properties of coral sand.…”

Section: Introductionmentioning

confidence: 99%

Study on shear characteristics of calcareous sand with different particle size distribution

Zhang

Luo

et al. 2023

Front. Earth Sci.

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For the island and reef project formed by filling calcareous sand, the problems of wide particle size distribution (PSD) and complex mechanical properties have to be faced. Therefore, in order to provide basic mechanical parameters for the construction of the island and reef project, triaxial shear tests were carried out on calcareous sands with five different typical PSDs. The results showed that as particle gradation became narrower, the axial strain corresponding to the strain-softening point all showed a decreasing trend and their differences gradually decreased; the confining pressure has a significant impact on the volumetric deformation modulus of calcareous sand with a wide PSD. The cohesion of calcareous sand showed a positive correlation with non-uniformity and curvature coefficients, while the variation of an internal friction angle showed a parabolic law; the internal friction angle also changes in the parabola with the change of fine particle contents. Furthermore, by establishing the PFC3D discrete element model, it was found that the numerical simulation results were in good agreement with the test results, which verifies the feasibility of the numerical simulation and the rationality of the mesoscopic parameter calibration. It was discovered that the wider the particle gradation range, the greater the axial strain corresponding to the critical coordination number; the sample with a narrow gradation interval was more likely to present a rotating displacement field to form a penetrating shear band. This study can provide design parameters for stability analysis of high and steep slopes in calcareous sand sites.

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“…Another limitation in the existing DEM simulations is that the realistic particle shapes were over-simplified as analytical shapes, spheres [36], clumps [37] and polyhedra [38]. These simplifications seem to be acceptable for quartz sand, but apparently not for calcareous sand [39,40]. The more complex idealisation of particle shapes requires more computation efforts due to the complicated contact algorithm.…”

Section: Introductionmentioning

confidence: 99%

An Efficient Parallel Framework for the Discrete Element Method Using GPU

2022

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The discrete element method (DEM), a discontinuum-based method to simulate the interaction between neighbouring particles of granular materials, suffers from intensive computational workload caused by massive particle numbers, irregular particle shapes, and complicated interaction modes from the meso-scale representation of the macro information. To promote the efficiency of the DEM and enlarge the modelling scales with a higher realism of the particle shapes, parallel computing on the graphics processing unit (GPU) is developed in this paper. The potential data race between the computing cores in the parallelisation is tackled by establishing the contact pair list with a hybrid technique. All the computations in the DEM are made on the GPU cores. Three benchmark cases, a triaxial test of a sand specimen, cone penetration test and granular flow due to a dam break, are used to evaluate the performance of the GPU parallel strategy. Acceleration of the GPU parallel simulations over the conventional CPU sequential counterparts is quantified in terms of speedup. The average speedups with the GPU parallelisation are 84, 73, and 60 for the benchmark cases.

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Experimental and numerical investigation on size effect on crushing behaviors of single calcareous sand particles

Cited by 33 publications

References 30 publications

DEM Analysis of Single-Particle Crushing Considering the Inhomogeneity of Material Properties

DEM Analysis of Single-Particle Crushing Considering the Inhomogeneity of Material Properties

Study on shear characteristics of calcareous sand with different particle size distribution

An Efficient Parallel Framework for the Discrete Element Method Using GPU

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