Particle flow modeling for direct shear behavior of rough joints

Xia, Chengjie; Zhou, Shi‐Ping; Du, Shasha; Song, Yanbin

doi:10.1201/b17395-78

Cited by 7 publications

(5 citation statements)

References 3 publications

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“…Some studies have examined the roughness of jointed rock mass by using a DEM model. For example, Xia et al [25] carried out a numerical simulation of shear experiments on nonbolted rock using the discrete element software PFC…”

Section: Introductionmentioning

confidence: 99%

Macro-Micro Failure Mechanisms and Damage Modeling of a Bolted Rock Joint

Wang

Zhang

Jiang

et al. 2017

Advances in Materials Science and Engineering

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The anchoring mechanism of a bolted joint subjected to a shear load was investigated using a bilinear constitutive model via the inner-embedded FISH language of particle flow code based on the discrete element method. The influences of the anchoring system on the macro-/micromechanical response were studied by varying the inclination angle of the bolt. The results indicate a clear relationship between the mechanical response of a bolted rock joint and the mechanical properties of the anchoring angle. By optimizing the anchorage angle, the peak strength can be increased by nearly 50% relative to that at an anchorage angle of 90 ∘ . The optimal anchorage angle ranges from 45 ∘ to 75 ∘ . The damage mechanism at the optimal anchorage angle joint is revealed from a macroscopic mechanical perspective. The concentration of the contact force between disks will appear in the joint and around the bolt, resulting in crack initiation. These cracks are mainly tensile cracks, which are consistent with the formation mechanism for compression-induced tensile cracks. Therefore, the macroscopic peak shear stress in the joint and the microscopic damage to the anchoring system should be considered when determining the optimal anchoring angle to reinforce a jointed rock mass.

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Section: Introductionmentioning

confidence: 99%

Macro-Micro Failure Mechanisms and Damage Modeling of a Bolted Rock Joint

Wang

Zhang

Jiang

et al. 2017

Advances in Materials Science and Engineering

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“…They found that the roughness and shear parameters of the joint surface decreased following an increase in the number of shear cycles. Xia et al (2012) conducted cyclic shear tests on joint surfaces under different normal stresses and found that as the normal stress increased, the peak shear strength of the same route in the same cycle increased. In addition, the shear strength of the rock joint surface decreased as the cyclic shearing times increased.…”

Section: Introductionmentioning

confidence: 99%

Calculating the shear strength of a rock mass joint surface considering cyclic shear deterioration

Wang²,

Bai

et al. 2022

Front. Earth Sci.

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The dynamic response of rock mass is largely restricted by its joint surface. Previous studies have shown that the degradation of joint surface can not be ignored when calculating the shear strength of structural plane under cyclic load. Although several studies have attempted to calculate the cyclic shear strength of a rock mass joint surface, an established and reliable method for calculating the cyclic shear strength of rock mass discontinuities is still lacking, thus necessitating further research. In this study, the deterioration effect of the shear strength of the joint surface under cyclic shearing was first analysed using cyclic shearing tests. The influence of vibration degradation in rock mass on the structural surface, undulant angle equation of the joint surface, and calculation method for the basic friction angle under a cyclic shearing load are proposed. Furthermore, the calculation method for the shear strength of the structural surface under the action of cyclic shearing is established. The proposed method is further validated through case analysis. The influence of the cutting and filling (produced during the shearing process) on the shear strength of the joint surface cannot be disregarded. The improved model proposed in this study is in good agreement with the experimental results; however, when the improved proposed method is used to estimate the cyclic shear strength of the joint surface where the normal stress is too large, calculation results may contain certain errors.

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“…For the gray sandstone, tensile failure is dominant and local shear failure occurs at a high impact velocity. As the shear failure mechanism of structural plane is more complex, numerical simulation as a scientific research method can effectively reflect the micro-and macromechanical properties of rock [17,18]. Huang et al [19] analyzed the failure mechanism of multiple cracks in rock by using RFPA software and combined it with existing research results and discussed the influence of spatial arrangement geometric characteristics, mechanical parameters, loading mode, and nonuniform factors of prefabricated cracks in rock on the stress field distribution, acoustic emission distribution, penetrative mode of rock bridge area, and breakthrough criterion in the evolution process.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Shear Failure Mechanism of Rock Mass with Intermittent Joints

Ren

Liu

2021

Advances in Civil Engineering

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There are a large number of discontinuous weak planes distributed in the natural rock mass, which makes the sliding failure of rock mass along the intermittent structural plane very complex. To investigate the shear failure mechanism of rock mass with intermittent joints and study the influence of different joint heights on the shear failure mode of the rock mass, direct shear tests were carried out by presetting a series of jointed rock specimens with different undulating heights. During the shear loading, digital image correlation (DIC) technology was employed to monitor the surface strain field of the specimens in real time. The results show that the fluctuation height has a significant effect on the evolution of shear strain. With the increase of shear load, the maximum shear strain of the jointed specimens with different undulating heights first increases slowly and then increases rapidly. When the undulating height is 5 mm, the failure of the specimen is dominated by the rock sliding along prefabricated joints. When the undulating height is larger than 10 mm, the shear fracture of the rock becomes dominant. With the increase of the undulating height, more penetrating cracks perpendicular to the preexisting joints appear between the serrated surfaces, and the shear fracture phenomenon is more obvious.

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Particle flow modeling for direct shear behavior of rough joints

Cited by 7 publications

References 3 publications

Macro-Micro Failure Mechanisms and Damage Modeling of a Bolted Rock Joint

Macro-Micro Failure Mechanisms and Damage Modeling of a Bolted Rock Joint

Calculating the shear strength of a rock mass joint surface considering cyclic shear deterioration

Experimental Investigation on Shear Failure Mechanism of Rock Mass with Intermittent Joints

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