A Study of the Failure Mechanism of Planar Non-Persistent Open Joints Using PFC2D

Ghazvinian, A.; Sarfarazi, Vahab; Schubert, Wulf; Blümel, Manfred

doi:10.1007/s00603-012-0233-2

Cited by 75 publications

(63 citation statements)

References 15 publications

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“…If the results of these simulated tests do not accurately represent the macro-properties of the rock material, the micro-parameters are adjusted until satisfactory results are obtained. It is beyond the scope of this paper to give a detailed calibration procedure of the numerical experiments, and further information can be found in other papers (Wang et al 2003;Potyondy and Cundall 2004;Cho et al 2007;Yoon 2007;Tang et al 2009;Ghazvinian et al 2012). …”

Section: Original Papermentioning

confidence: 97%

“…Because the micro-parameters of the real rock material are not known directly from laboratory tests, a calibration process (i.e., upscaling) that makes the assembly of bonded particles reproduce the macro-properties of the real rock material, such as uniaxial compressive strength (UCS), tensile strength, Young's modulus, internal friction angle and cohesion, should be carried out. In this process, the numerical uniaxial/biaxial compressive test and the Brazilian test are recommended as the test experiments (Potyondy and Cundall 2004;Cho et al 2007;Ghazvinian et al 2012). If the results of these simulated tests do not accurately represent the macro-properties of the rock material, the micro-parameters are adjusted until satisfactory results are obtained.…”

Section: Original Papermentioning

confidence: 99%

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Step-path failure of rock slopes with intermittent joints

et al. 2014

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Step-path failure is a typical instable mode of rock slopes with intermittent joints. To gain deeper insight into the step-path failure mechanism, six rock slopes with different intermittent joints are studied using the 2D Particle Flow Code (PFC). Three different step-path failure modes, i.e., shear, tensile, and mixed tensile-shear failure, are observed by focusing on the crack initiation, propagation, and coalescence in the rock bridges. The cracks develop progressively in the rock bridges, which induce the intermittent joints to coalesce one by one from bottom to top under the action of gravity. The tensile cracks that often appear in the main body and at the crown are nearly vertical to the step-path failure surface. The step-path failure in a rock slope with intermittent joints can be divided into four stages in terms of both stress and crack development in the rock bridges, i.e., elastic deformation, failure of rock bridges at a lower position, progressive failure of rock bridges upward, and final block slide. Therefore, reinforcement is suggested to be applied to the lower part of the slopes. Three equations for calculating the factors of safety are derived with respect to the three failure modes, in which the degree of joint coalescence is considered.

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Section: Original Papermentioning

confidence: 97%

Section: Original Papermentioning

confidence: 99%

Step-path failure of rock slopes with intermittent joints

et al. 2014

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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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“…They analyzed the stress and displacement distribution associated with the crack coalescence process. Ghazvinian et al [24,25] simulated the shear behavior of rock-like material specimens containing two edge planar and non-coplanar non-persistent joints under direct shear test by PFC 2D . Bewick et al [26,27] studied the macro-mechanical properties and meso-mechanism rock materials under direct shear using PFC 2D simulation.…”

Section: Introductionmentioning

confidence: 99%

Particle flow study on strength and meso-mechanism of Brazilian splitting test for jointed rock mass

Yang

Huang

2014

Acta Mech Sin

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A discrete element method (DEM) called particle flow code (PFC 2D ) was used to construct a model for Brazilian disc splitting test in the present study. Based on the experimental results of intact Brazilian disc of rock-like material, a set of micro-parameters in PFC 2D that reflected the macro-mechanical behavior of rock-like materials were obtained. And then PFC 2D was used to simulate Brazilian splitting test for jointed rock mass specimens and specimen containing a central straight notch. The effect of joint angle and notch angle on the tensile strength and failure mode of jointed rock specimens was detailed analyzed. In order to reveal the meso-mechanical mechanism of crack coalescence, displacement trend lines were applied to analyze the displacement evolution during the crack initiation and propagation. The investigated conclusions can be described as follows.(1) The tensile strength of jointed rock mass disc specimen is dependent to the joint angle. As the joint angle increases, the tensile strength of jointed rock specimen takes on a nonlinear variance. (2) The tensile strength of jointed rock mass disc specimen containing a central straight notch distributes as a function of both joint angle and notch angle. (3) Three major failure modes, i.e., pure tensile failure, shear failure and mixed tension and shear failure mode are observed in jointed rock mass disc specimens under Brazilian test. (4) The notch angle and joint angle play important roles on crack initiation and propagation characteristics of jointed rock mass disc specimen containing a central straight notch under Brazilian test.

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A Study of the Failure Mechanism of Planar Non-Persistent Open Joints Using PFC2D

Cited by 75 publications

References 15 publications

Step-path failure of rock slopes with intermittent joints

Step-path failure of rock slopes with intermittent joints

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

Particle flow study on strength and meso-mechanism of Brazilian splitting test for jointed rock mass

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