Discrete element simulation of rock cutting

Rojek, Jerzy; Oñate, Eugenio; Labra, Carlos; Kargl, Hubert

doi:10.1016/j.ijrmms.2011.06.003

Cited by 201 publications

(116 citation statements)

References 26 publications

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“…The disc-shaped particles are considered as rigid bodies and their translational motions and rotational motions are governed by the standard equations of rigid body dynamics: are damping force and damping moment respectively, which are introduced to dissipate kinetic energy and gain a quasi-static state of equilibrium of the particles and are expressed as [34]:…”

Section: Numerical Simulation Modelmentioning

confidence: 99%

“…m p and J p are mass and moment of inertia of particle p respectively. F d p and M d p are damping force and damping moment respectively, which are introduced to dissipate kinetic energy and gain a quasi-static state of equilibrium of the particles and are expressed as [34]:…”

Section: Numerical Simulation Modelmentioning

confidence: 99%

“…∆t should not exceed the critical time step ∆t c to remain numerical stability as introduced in [34]. The forces and moments are transmitted through the contacts between particles or the contacts between particles and plates.…”

Section: Numerical Simulation Modelmentioning

confidence: 99%

“…Young's modulus and Poisson's ratio discussed here are the apparent ones. By using dimensionless analysis similar to [28,34], the dimensionless micro parameters are k s /k n , k m /(k n R), ε s 0 /ε n 0 , ε s max /ε n 0 , ϕ, ϕ f , w, b, and the dimensionless macro parameters are…”

Section: Dimensionless Parameters In Net-bpmmentioning

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: Numerical Simulation Modelmentioning

confidence: 99%

Section: Numerical Simulation Modelmentioning

confidence: 99%

Section: Dimensionless Parameters In Net-bpmmentioning

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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“…A computer simulation of a roadheader mining process can be performed with various modelling methods. One of the research directions in this field is to use the finite elements and discrete elements method, as well as neural networks for the purpose of rock mining process modelling (Huang et al, 2013;Jaime et al, 2010;Jamie, 2011;Kui-Dong et al, 2012;Rojek et al, 2010;Shenghua, 2004;Xiang & Duan, 2014;Xueyi et al, 2012). An alternative approach is to analyse breakout graphics.…”

Section: Introductionmentioning

confidence: 99%

New Computer Simulation Procedure of Heading Face Mining Process with Transverse Cutting Heads for Roadheader Automation

Dolipski

Cheluszka

Sobota

et al. 2017

Archives of Mining Sciences

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The key working process carried out by roadheaders is rock mining. For this reason, the mathematical modelling of the mining process is underlying the prediction of a dynamic load on the main components of a roadheader, the prediction of power demand for rock cutting with given properties or the prediction of energy consumption of this process. The theoretical and experimental investigations conducted point out -especially in relation to the technical parameters of roadheaders used these days in underground mining and their operating conditions -that the mathematical models of the process employed to date have many limitations, and in many cases the results obtained using such models deviate largely from the reality. This is due to the fact that certain factors strongly influencing cutting process progress have not been considered at the modelling stage, or have been approached in an oversimplified fashion.The article presents a new model of a rock cutting process using conical picks of cutting heads of boom-type roadheaders. An important novelty with respect to the models applied to date is, firstly, that the actual shape of cuts has been modelled with such shape resulting from the geometry of the currently used conical picks, and, secondly, variations in the depth of cuts in the cutting path of individual picks have been considered with such variations resulting from the picks' kinematics during the advancement of transverse cutting heads parallel to the floor surface. The work presents examples of simulation results for mining with a roadheader's transverse head equipped with 80 conical picks and compares them with the outcomes obtained using the existing model. Keywords: roadheader, mining, cutting process modelling, computer simulation Urabianie skał jest zasadniczym procesem roboczym realizowanym przez kombajny górnicze. Modelowanie matematyczne tego procesu stanowi dlatego podstawę predykcji obciążenia dynamicznego głównych podzespołów kombajnu, prognozowania zapotrzebowania mocy do urabiania skał o określonych własnościach oraz jego energochłonności. Prowadzone badania teoretyczne i doświadczalne wskazują, w szczególności w odniesieniu do parametrów technicznych obecnie stosowanych w górnictwie podziemnym kombajnów chodnikowych oraz warunków ich eksploatacji, że wykorzystywane dotychczas

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Discrete element modeling of indentation tests to investigate mechanisms of CO₂‐related chemomechanical rock alteration

2016

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During CO2 injection into geological formations, petrophysical and geomechanical properties of host formations can be altered due to mineral dissolution and precipitation. Field and laboratory results have shown that sandstone and siltstone can be altered by CO2‐water mixtures, but few quantitative studies have been performed to fully investigate underlying mechanisms. Based on the hypothesis that CO2‐water mixtures alter the integrity of rock structure by attacking cements rather than grains, we attempt to explain the degradation of cementation due to long‐term contact with CO2 and water and mechanisms for changes in rock mechanical properties. Many sandstones, including calcite‐cemented quartzitic sandstone, chlorite‐cemented quartzitic sandstone, and hematite‐cemented quartzitic sandstone, contain interparticle cements that are more readily affected by CO2‐water mixtures than grains. A model that couples the discrete element method and the bonded‐particle model is used to perform simulations of indentation tests on synthetic rocks with crystal and random packings. The model is verified against the analytical cavity expansion model and validated against laboratory indentation tests on Entrada sandstone with and without CO2 alteration. Sensitivity analysis is performed for cementation microscopic parameters including stiffness, size, axial, and shear strength. The simulation results indicate that the CO2‐related degradation of mechanical properties in bleached Entrada sandstone can be attributed to the reduction of cement size rather than cement strength. Our study indicates that it is possible to describe the CO2‐related rock alteration through particle‐scale mechanisms.

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Discrete element simulation of rock cutting

Cited by 201 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

New Computer Simulation Procedure of Heading Face Mining Process with Transverse Cutting Heads for Roadheader Automation

Discrete element modeling of indentation tests to investigate mechanisms of CO₂‐related chemomechanical rock alteration

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Discrete element simulation of rock cutting

Cited by 201 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

New Computer Simulation Procedure of Heading Face Mining Process with Transverse Cutting Heads for Roadheader Automation

Discrete element modeling of indentation tests to investigate mechanisms of CO2‐related chemomechanical rock alteration

Contact Info

Product

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Discrete element modeling of indentation tests to investigate mechanisms of CO₂‐related chemomechanical rock alteration