Progressive Fracture Behavior and Acoustic Emission Release of CJBs Affected by Joint Distance Ratio

Wang, Yongyi; Gong, Bin; Zhang, Yongjun; Yang, Xiaoyu; Tang, Chun’an

doi:10.3390/math10214149

Cited by 19 publications

(11 citation statements)

References 36 publications

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“…The numerical simulations of the layered shale samples under uniaxial and triaxial compression were carried out using the RFPA method 33‐35 based on the statistical strength theory, damage mechanics and continuum theory. By introducing the heterogeneity coefficient to characterize the heterogeneity of rock material, it can simulate the redistribution of the stress field and the induced creation and evolution of microfractures 36‐38 . It has been applied to numerically reproduce the gradual failure process of rock material by many researchers 39‐41 .…”

Section: Methodsmentioning

confidence: 99%

Investigation of the anisotropic mechanical response of layered shales

Gao,

Gong,

Liang

et al. 2023

Energy Science & Engineering

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Layered shales exist widely and are often encountered during shale gas development. However, the mechanical response of layered shales is significantly affected by the existence of beddings, resulting in the obvious anisotropy characteristics regarding deformation, strength and failure mode. To clarify the underlying mechanisms of shale anisotropy that control the safety of engineering projects, the numerical simulation and theoretical analysis were conducted. The results show that with the growth of confining pressure, the compressive resistance of shales gradually increases, the shear fractures govern the instability and the anisotropy index decreases. Furthermore, several strength criteria for layered rock masses were summarized, and the modified Jaeger strength criterion was proposed by introducing the anisotropic parameter . It can effectively reflect the failure modes and strength features of layered shales under triaxial conditions with a higher accuracy. Besides, the variation of cohesion and internal friction angle of layered shale samples was comprehensively analysed under the triaxial conditions. Clearly, as the inclination angle of bedding planes increases, the cohesion of layered shales first decreases, but then increases under triaxial compression, showing the ‘U’‐shaped changing trend. Additionally, the internal friction angle of layered shales gradually increases with the increase in the inclination of bedding planes.

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Section: Methodsmentioning

confidence: 99%

Investigation of the anisotropic mechanical response of layered shales

Gao,

Gong,

Liang

et al. 2023

Energy Science & Engineering

Self Cite

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show abstract

“…The numerical simulations of the layered shale samples under uniaxial and triaxial compression were carried out using the RFPA method (Chen et al 2022a;Gong et al, 2019a;Wang et al, 2021) based on based on the statistical strength theory, damage mechanics and continuum theory. By introducing the heterogeneity coefficient to characterize the heterogeneity of rock material, it can simulate the redistribution of stress field and the induced creation and evolution of microfractures (Gong et al, 2022a;Wang et al, 2022c;Yu et al, 2022). It has been applied to numerically reproduce the gradual failure process of rock material by many researchers (Chen et al, 2022b;Gong et al 2019b;Gong et al 2022b).…”

Section: Theoretical Principlesmentioning

confidence: 99%

Anisotropic mechanical response of layered shales: Insights from numerical simulations

Gao

Gong

Liang

et al. 2023

Preprint

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Layered shales exist widely in nature and are often encountered during infrastructure construction. However, the mechanical response of layered shales is significantly affected by the existence of beddings, resulting in the obvious anisotropy characteristics in terms of deformation, strength, and failure mode. To clarify the underlying mechanisms of shale anisotropy that control the safety of engineering projects, the combined numerical simulation and theoretical analysis were conducted. The results show that with the growth of confining pressure, the compressive resistance of shales gradually increases, the shear fractures govern the sample instability, and the anisotropy index continues to decrease. Furthermore, several strength criteria for layered rock masses were summarized, and the modified Jaeger strength criterion was proposed by introducing the anisotropic parameter Rcθ. It can effectively reflect the failure modes and strength features of layered shales under triaxial conditions with the higher accuracy. Besides, the variation of cohesion and internal friction angle of layered shale samples was comprehensively analysed under the triaxial conditions. Clearly, as the inclination angle of bedding planes rises, the cohesion of layered shales first decreases, but then increases under triaxial compression, showing the ‘U’-shaped changing trend. Additionally, the internal friction angle of layered shales grows up gradually with the inclination of bedding planes increasing.

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“…Some scholars have studied fault activation through indoor experiments, Ohno et al [22] conducted injection tests and repeated packer tests on siliceous mudstone faults, which can effectively evaluate the sensitivity of fault hydraulic fracturing to fault activation. Chen and Gong et al [23][24][25] used acoustic emission technology to unite RFPA software to simulate and analyze the failure process of deep rock joints, and revealed the failure mechanism of deep jointed rock mass during excavation. Mngadi and Nguyen et al [26,27] carried out friction experiments of different groups on rocks from deep mining in high-stress areas, and described the propagation process of the fracture along the underground brittle shear zone, which is of great significance to the study of rockburst.…”

Section: Introductionmentioning

confidence: 99%

Research on Fault Activation and Its Influencing Factors on the Barrier Effect of Rock Mass Movement Induced by Mining

Guo

Luo

Wang³

2023

Applied Sciences

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For the study of the driving forces behind fault activation and its influencing factors on the barrier effect of rock mass movement under the influence of mining, the discrete element numerical simulation software 3DEC was used for the analysis of the impact on the distance to mining area from fault, the buried depth of the upper boundary of the fault, the dip angle of fault, the size of the mining area and the thickness of the fault zone respectively. The results show that the mining areas are closer to the fault as distances decrease, the burial depth of the upper boundary of the fault increases, and the size of the mining area increases, the fault is easier to activate, and fault activation has a stronger barrier impact on displacement field and stress field propagation. When the fault is cut into the goaf, the difference of rock displacement in both directions of the fault increases when the dip of the fault increases, and the fault is more susceptible to instability and activation. The barrier strength grows with the increase of the thickness of the fault fracture zone. The results of this study have important implications for the guard against and control of deep mining-related fault activation disasters.

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Progressive Fracture Behavior and Acoustic Emission Release of CJBs Affected by Joint Distance Ratio

Cited by 19 publications

References 36 publications

Investigation of the anisotropic mechanical response of layered shales

Investigation of the anisotropic mechanical response of layered shales

Anisotropic mechanical response of layered shales: Insights from numerical simulations

Research on Fault Activation and Its Influencing Factors on the Barrier Effect of Rock Mass Movement Induced by Mining

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