Failure mechanisms and damage evolution of hard rock joints under high stress: Insights from PFC2D modeling

Meng, Fanyong; Song, Jie; Yue, Zhufeng; Zhou, Hui; Xiaoshan, Wang; Wang, Zaiquan

doi:10.1016/j.enganabound.2021.12.007

Cited by 26 publications

(8 citation statements)

References 67 publications

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“…This study addressed these challenges by utilizing the ABAQUS, employing the method of global embedding of zero-thickness cohesive elements to accurately replicate the shear process of jointed rock mass with various roughness. The observations made in this study during the evolution of subtle fractures in the jointed rock closely resemble those found by Huan et al 58 , Bahaaddini et al 59 , Meng et al 60 , which used discrete element software PFC to observe microcrack propagation during shear. Taking Bahaaddini’s study 59 as an example, in which they investigated the degradation of roughness during shear and its impact on jointed rock shear behavior, in the pre-yielding stage, the model only generated small cracks, and when the shear stress reached the yielding shear stress, tensile cracks appeared at the protrusions.…”

Section: Discussion On the Test And Errorssupporting

confidence: 85%

“…After completing the laboratory tests, numerical simulations can further verify the correctness of the test results. The numerical simulations by Huan et al 58 , Bahaaddini et al 59 , Meng et al 60 , and Han et al 62 show a good consistence with test data. However, the simulated data in this tests show some deviations from the displacement-stress curve obtained in the lab tests.…”

Section: Discussion On the Test And Errorsmentioning

confidence: 74%

“…Meng er al. 60 simulated the failure mechanisms and damage evolution of hard rock joints using software, revealing that rougher joints produced more cracks under higher normal stress. In the rapid growth stage of shear under high normal stress, cracks in rough joints expand faster.…”

Section: Relative Workmentioning

confidence: 99%

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Shear damage mechanisms of jointed rock mass: a macroscopic and mesoscopic study

Wang,

Liu,

Jiang

et al. 2024

Sci Rep

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The joints are existing throughout the underground rock mass. It is of great significance to investigate the shear performance of the rock mass to maintain the stability of the underground structure. In this study, we conducted orthogonal tests to determine the proportion of rock-like materials, and used JRC curves to make specimen molds and then prepare the specimens. We conducted straight shear tests and uniaxial compression tests to determine the various mechanical parameters of the rock-like materials. Next, we carried out the compression and shear tests to investigate the shear characteristics of the specimens, and study the damage pattern and shear strength of the jointed rock mass under different confining pressures and roughness levels. The mesoscopic displacements in the shear process of joints were analyzed by using ABAQUS. The test results show that the effect of the confining pressure on the shear strength of the joint plane is relatively obvious, and a larger confining pressure indicates a larger shear strength. The effects of different joint plane roughness and shear rated on the shear characteristics of the joint plane are also significant. The mesoscopic displacement difference inside the joint plane with higher roughness is relatively large, and the stress concentration phenomenon is obvious and lasts longer, which leads to the faster destruction of the specimen with higher roughness and the higher destruction degree. Therefore, we suggest that the priority should be given to the reinforcement of jointed rock mass with high roughness during the construction to prevent sudden destabilization and failure.

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Section: Discussion On the Test And Errorssupporting

confidence: 85%

Section: Discussion On the Test And Errorsmentioning

confidence: 74%

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Shear damage mechanisms of jointed rock mass: a macroscopic and mesoscopic study

Wang,

Liu,

Jiang

et al. 2024

Sci Rep

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“…Cheng (2019) investigated the effect of normal stress on the shear strength of coal bulk. Meng et al (2022) analyzed the influence of particle size on shear behavior using PFC modeling. Xiao et al (2021) developed four numerical models of various joint roughnesses using FLAC3D and examined the impact of joint roughness on shear mechanics.…”

Section: Introductionmentioning

confidence: 99%

Influence of normal stress on the shear strength of the structural plane considering the size effect

Huang

Hu²

2023

Front. Earth Sci.

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The shear strength of a structural plane is a critical parameter in the analysis of engineering rock stability. Significant differences exist due to the various normal stresses in the structural plane. Therefore, evaluating the rock deformation to effectively determine the influence of normal stresses at different scales on the shear strength of structural planes is of great significance. This study discusses the effects of normal stress and structural plane size on shear strength through numerical simulations and regression analysis. The results showed that the shear strength of the structural plane increases linearly with increasing normal stress. The shear strength of the structural plane decreases with increasing size, and the corresponding curve is exponential. The characteristic size and shear strength increase linearly with increasing normal stress. This paper presents the concrete form of these relationships, which can be used to calculate and predict the shear strength, which has significance in guiding engineering.

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“…Numerous numerical investigations and experimental investigations have been conducted on rocks with microscopic structural planes and macroscopic structural planes [ 2 , 4 , 6 , 9 ]. Moreover, advanced techniques offer us chances to attain a more practical and even real-time development of microstructure, e.g., acoustic emission (AE) detection [ 10 , 11 ], the scanning electron microscope (SEM) [ 12 ], X-ray micro-computed tomography (CT) [ 13 , 14 ]. As for crack propagation, many scholars have conducted laboratory experiments with natural crack rock and rock-like materials [ 5 , 8 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Failure Behavior of Brittle Heterogeneous Rock under Uniaxial Compression Test

Liu

Guo

et al. 2022

Materials

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Rocks have formed heterogeneous characteristics after experiencing complex natural geological processes. Studying the heterogeneity of rocks is significant for rock mechanics. In this study, a linear parallel bond model with Weibull distribution in two-dimensional particle flow code (PFC2D) is adopted to study the mechanical characteristics and brittle failure mode of granite rock specimens with different heterogeneity. Firstly, we selected several combinations of key micro-parameters of the parallel bond model. Then, we subjected them to a Weibull distribution to satisfy heterogeneity, respectively. Finally, we chose one optimal combination plan after comparing the stress–strain curves of heterogeneous rock specimens. We analyzed the simulated results of heterogeneous rock specimens. The crack distribution of rock specimens under peak stress shows different characteristics: a diagonal shape in rock specimens with low heterogeneity indexes, or a rotated “y” shape in rock specimens with high heterogeneity indexes. As for failure mode, the numerical simulation results show high consistency with the laboratory experiment results. The rock specimen breaks down almost diagonally, and the whole specimen tends to form an x-shaped conjugate shear failure or the well-known “hour-glass” failure mode. With the increase of the homogeneity index of the rock specimen, the shear rupture angle becomes larger and larger. Generally, the crack number increases with time, and when the rock specimen reaches the peak failure point, the number of cracks increases sharply. The development of cracks in numerical rock specimens under compression test is a result of the coalescence of many microscopic cracks. Furthermore, tensile cracks formed initially, followed by shear behavior along the macroscopic crack plane. We also preliminarily study the mechanical characteristics of heterogeneous rock specimens with discontinuous structural planes. The discontinuous structural planes are simulated by the smooth-joint model. We can conclude that the discontinuous structural planes and the microscopic structural planes which contribute to the heterogeneity have a mutual influence on each other.

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Failure mechanisms and damage evolution of hard rock joints under high stress: Insights from PFC2D modeling

Cited by 26 publications

References 67 publications

Shear damage mechanisms of jointed rock mass: a macroscopic and mesoscopic study

Shear damage mechanisms of jointed rock mass: a macroscopic and mesoscopic study

Influence of normal stress on the shear strength of the structural plane considering the size effect

Numerical Simulation of Failure Behavior of Brittle Heterogeneous Rock under Uniaxial Compression Test

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