Modeling Particle Rolling Behavior by the Modified Eccentric Circle Model of DEM

Chang, Y. L.; Chen, Tsung Hsien; Weng, Meng-Chia

doi:10.1007/s00603-012-0227-0

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…In the cases of both the spherical and polyhedral particle systems, local rotational damping was applied using a rolling coefficient of 0.001, i.e. the angular rotation was damped using the rolling coefficient so that the angular velocity was decreased by the product of the rolling coefficient and angular velocity in every time step, similar to approaches by Chang et al [24], Tu and Andrade [25] and Sandlin [26].…”

Section: Materials Propertiesmentioning

confidence: 99%

Discrete element model study into effects of particle shape on backfill response to cyclic loading behind an integral bridge abutment

et al. 2018

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The discrete element method, implemented in a modular GPU based framework that supports polyhedral shaped particles (Blaze-DEM), was used to investigate effects of particle shape on backfill response behind integral bridge abutments during temperature-induced displacement cycles. The rate and magnitude of horizontal stress build-up were found to be strongly related to particle sphericity. The stress build-up in particles of high sphericity was gradual and related to densification extending relatively far from the abutment. With increasing angularities, densification was localised near the abutment, but larger and more rapid stress build-up occurred, supported by particle reorientation and interlock developing further away.

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Section: Materials Propertiesmentioning

confidence: 99%

Discrete element model study into effects of particle shape on backfill response to cyclic loading behind an integral bridge abutment

et al. 2018

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“…The DEM has been implemented in many programs . Particle Flow Code in 2 Dimensions (PFC 2D ) is one of the widely used programs and has been extensively utilized to investigate the micro‐deformation mechanisms and failure patterns of geomaterials . This study adopted PFC 2D to investigate the behavior of clastic rock.…”

Section: Introductionmentioning

confidence: 99%

Characterization of clastic rock using a biconcave bond model of DEM

Chiu

Weng

Huang

2016

Num Anal Meth Geomechanics

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Summary This paper presents a biconcave bond model to investigate the effect of the cementation between grains on the mechanical behavior of rock. The proposed model considers the shape of the bonds among particles that have a biconcave cement form, based on observations of microscopic rock images. The general equations of the proposed model are based on Dvorkin theory. The accuracy and efficiency of the bond model is improved in three ways. After the biconcave bond model is implemented in the discrete element method software Particle Flow Code in 2 Dimensions, a series of numerical uniaxial compression tests were performed to investigate the relationships between the micro‐ to macro‐parameters. The simulations revealed that the biconcave bond model reflects the effect of micro‐parameters, such as the elastic modulus and Poisson's ratio of the cement, on the macroscopic deformation of cemented granular material. Variations in the bond geometry caused extremely diverse macro‐mechanical behaviors. Experimental results concerning rock demonstrate that the biconcave bond model accurately captures the mechanical behavior of intact rock and supports an innovative method for investigating the relationships between the micro‐ and macro‐parameters of cemented granular material. Copyright © 2016 John Wiley & Sons, Ltd.

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Discrete Element Modeling of Instability Mechanisms of Unbound Permeable Aggregate Base Materials in Triaxial Compression

Xiao

Wang

et al. 2022

Materials

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Unbound permeable aggregate base (UPAB) materials with strong load-transmitting skeleton yet adequate inter-connected pores are desired for use in the sponge-city initiative. However, the micro-scale fabric evolution and instability mechanism of macroscopic strength behavior of such UPAB materials still remain unclear. In this study, virtual monotonic triaxial compression tests were conducted by using the discrete element method (DEM) modeling approach on specimens with different gradations quantified by the parameter of gravel-to-sand ratio (G/S). The realistic aggregate particle shape and inter-particle contact behavior were properly considered in the DEM model. The micromechanical mechanisms of the shearing failure of such UPAB materials and their evolution characteristics with G/S values were disclosed from contact force chains, microstructures, and particle motion. It was found that the proportion of rotating particles in the specimens decreased and the proportion of relative sliding between particles increased as the content of fine particles decreased. The plastic yielding of the specimens originated from the failure of contact force chains and the occurrence of the relative motion between particles, while the final instability was manifested by the large-scale relative motion among particles along the failure plane (i.e., changes in the internal particle topology). By comparing the macroscopic strength, microstructure evolution, and particle motion characteristics of the specimens with different G/S values, it was found that the specimens with G/S value of 1.8 performed the best, and that the G/S value of 1.8 could be regarded as the threshold for separating floating dense and skeletal gap type packing structures. The variation of Euler angles of rotating particles was significantly reduced in the particle size range of 4.75 mm to 9.50 mm, indicating that this size range separates most of the particles from rolling and sliding. Since particle rolling and sliding behavior are directly related to shear strength, this validates the rationality of the parameter G/S for controlling and optimizing gradations from the perspective of particle movement. The findings could provide theoretical basis and technical guidance for the effective design and efficient utilization of UPAB materials.

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Modeling Particle Rolling Behavior by the Modified Eccentric Circle Model of DEM

Cited by 3 publications

References 17 publications

Discrete element model study into effects of particle shape on backfill response to cyclic loading behind an integral bridge abutment

Discrete element model study into effects of particle shape on backfill response to cyclic loading behind an integral bridge abutment

Characterization of clastic rock using a biconcave bond model of DEM

Discrete Element Modeling of Instability Mechanisms of Unbound Permeable Aggregate Base Materials in Triaxial Compression

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