A Bonded Particle Model Simulation of Shear Strength and Asperity Degradation for Rough Rock Fractures

Asadi, Mohammad Sadegh; Rasouli, Vamegh; Barla, Giovanni Battista

doi:10.1007/s00603-012-0231-4

Cited by 57 publications

(48 citation statements)

References 26 publications

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“…The centroid displacement and rotation angle of particle p can be obtained by using an explicit central difference method to integrate Equations (10) and (11). The algorithm is described as follows:…”

Section: Numerical Simulation Modelmentioning

confidence: 99%

“…Discrete element method (DEM) is proved to be a very effective method in modelling rock-like materials [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. The discontinuous nature of DEM makes DEM very suitable for dealing with the initiation and propagation of micro cracks in rock-like materials.…”

Section: Introductionmentioning

confidence: 99%

“…The discontinuous nature of DEM makes DEM very suitable for dealing with the initiation and propagation of micro cracks in rock-like materials. Within DEMs, the bonded-particle model (BPM) is widely used to simulate the deformation and fracture of rock-like materials [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Since the BPM was first proposed [1], it has been rapidly developed.…”

Section: Introductionmentioning

confidence: 99%

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Bonded-Particle Model with Nonlinear Elastic Tensile Stiffness for Rock-Like Materials

Ouyang

Chen

2017

Applied Sciences

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Abstract:The bonded-particle model (BPM) is a very efficient numerical method in dealing with initiation and propagation of cracks in rocks and can model the fracture processes and most of macro parameters of rocks well. However, typical discrete element method (DEM) underestimates the ratio of the uniaxial compressive strength to the tensile strength (UCS/TS). In this paper, a new DEM method with a nonlinear elastic tensile model embedded in BPM is proposed, which is named as nonlinear elastic tensile bonded particle model (NET-BPM). The relationships between micro parameters in NET-BPM and macro parameters of specimens are investigated by simulating uniaxial compression tests and direct tension tests. The results show that both the shape coefficient of the nonlinear elastic model and the bond width coefficient are important in predicting the value of UCS/TS, whose value ranging from 5 to 45 was obtained in our simulations. It is shown that the NET-BPM model is able to reproduce the nonlinear behavior of hard rocks such as Lac du Bonnet (LDB) granite and the quartzite under tension and the ratio of compressive Young's modulus to tensile Young's modulus higher than 1.0. Furthermore, the stress-strain curves in the simulations of LDB granite and the quartzite with NET-BPM model are in good agreement with the experimental results. NET-BPM is proved to be a very suitable method for modelling the deformation and fracture of rock-like materials.

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Section: Numerical Simulation Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bonded-Particle Model with Nonlinear Elastic Tensile Stiffness for Rock-Like Materials

Ouyang

Chen

2017

Applied Sciences

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“…Some researches have been done by PFC software, and also some papers have been submitted to different journals by Chang et al (2011), He et al (2010, Jackson et al (2008), Liu and Koyi (2012), Poisel et al (2009), Thompson et al (2009), Wang et al (2003, Ghazvinian et al (2012), Asadi et al (2012). This software is used to model the movements and interactions of spherical particles using the Distinct Element Method.…”

Section: Particle Flow Code (Pfc2d)mentioning

confidence: 99%

Measuring Displacement and Contact Forces Among the Particles in Unloading of Slope by PFC2D (Particle Flow Code) / Pomiary przemieszczeń i sił kontaktu pomiędzy cząstkami materialnymi w trakcie wybierania wyrobiska pochyłego przy pomocy programu PFC2D

Behbahani¹,

Moarefvand²,

Ahangari³

et al. 2013

Archives of Mining Sciences

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When instability is observed in the walls of open pit mining, at this time, engineers are faced with a moving mass which is a combination of materials that move on each other and on the main slip surface. Modeling of this movement can have an effective assistance to mining engineers to predict the movement behavior, displacement estimate, and the moving volumes. One of the suitable software which is capable of modeling of sliding behavior is PFC (Particle Flow Code). It is based on Discrete Element Method and released by the Itasca Company. In this paper, the modeling of sliding mass and unloading it in seven stages have been done. During the seven stages of unloading the maximum displacement and maximum contact forces among the particles are obtained. Maximum displacement happened in the fifth stage of the unloading and it is equal to 134.8 meters. Maximum contact forces occurred in the first stage of the unloading after initial equilibrium stage and it is equal to 1917 kN. The model for unloading of sliding mass presented in this paper is just an example and it is not a definite model for unloading of each sliding mass. Unloading of sliding mass depends on the situation of sliding mass and its volume and also mining limitations. Keyword: Unloading, Discrete Element Method (DEM), Sliding Mass, PFC2DW przypadku wystąpienia niestabilności ścian pochyłego wyrobiska odkrywkowego, inżynierowie mają do czynienia z przemieszczającą się masa -będącą kombinacją materiałów przesuwających się względem siebie a także zsuwających się w dół po powierzchni spadu. Modelowanie tego ruchu może znacznie pomóc inżynierom-górnikom w prognozowaniu zachowań terenu w trakcie tego ruchu, do szacowania wielkości przemieszczeń i objętości przemieszczających się mas materiału. Jednym z programów wspomagających modelowanie przemieszczeń tego typu jest oprogramowanie Particle Flow Code PFC, rozprowadzane przez firmę Itasca, wykorzystujące metodę elementów dyskretnych. W pracy tej

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“…and Hazzard, 2008, Wanne and Young, 2008, Park and Song, 2009, Schöpfer et al, 2009, Asadi et al, 2012, Zhang et al, 2012, Yoon et al, 2015. (Simmons andRichter, 1976, Kranz, 1983).…”

mentioning

confidence: 99%

Polygonal Grain-Based Distinct Element Modelling of Mechanical Characteristics and Transverse Isotropy of Rock

Park¹,

Park²,

Ryu³

et al. 2016

Tunnel and Underground Space

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This study presents a methodology to reproduce the mechanical behavior of isotropic or transversely isotropic rock using the polygonal grain-based distinct element model. A numerical technique to monitor the evolution of micro-cracks during the simulation was developed in the present study, which enabled us to examine the contribution of tensile cracking and shear cracking to the progressive process of the failure. The numerical results demonstrated good agreement with general observations from rock specimens in terms of the behavior and the evolution of micro-cracks, suggesting the capability of the model to represent the mechanical behavior of rock. We also carried out a parametric study as a fundamental work to examine the relationships between the microscopic properties of the constituents and the macroscopic behavior of the model. Depending on the micro-properties, the model exhibited a variety of responses to the external load in terms of the strength and deformation characteristics. In addition, a numerical technique to reproduce the transversely isotropic rock was suggested and applied to Asan gneiss from Korea. The behavior of the numerical model was in good agreement with the results obtained in the laboratory-scale experiments of the rock.

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A Bonded Particle Model Simulation of Shear Strength and Asperity Degradation for Rough Rock Fractures

Cited by 57 publications

References 26 publications

Bonded-Particle Model with Nonlinear Elastic Tensile Stiffness for Rock-Like Materials

Bonded-Particle Model with Nonlinear Elastic Tensile Stiffness for Rock-Like Materials

Measuring Displacement and Contact Forces Among the Particles in Unloading of Slope by PFC2D (Particle Flow Code) / Pomiary przemieszczeń i sił kontaktu pomiędzy cząstkami materialnymi w trakcie wybierania wyrobiska pochyłego przy pomocy programu PFC2D

Polygonal Grain-Based Distinct Element Modelling of Mechanical Characteristics and Transverse Isotropy of Rock

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