Investigation into Macro- and Microcrack Propagation Mechanism of Red Sandstone under Different Confining Pressures Using 3D Numerical Simulation and CT Verification

Zhang, Wen; Chen, Yanyu; Guo, Jianchun; Wu, Saisai; Yan, Cheng-yuan

doi:10.1155/2021/2871687

Cited by 3 publications

(1 citation statement)

References 32 publications

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“…However, the combination of experi-ments and numerical simulations provides a promising approach for studying microscale fracture propagation and its mechanical mechanisms. By conducting experiments to obtain mechanical properties, mineral distribution, and microstrains during the process of fracture propagation, and subsequently performing targeted numerical simulations, a better understanding of the mechanical mechanisms governing microscale fracture propagation can be achieved [36,116,117].…”

Section: Microscale Fracture Simulation In Shalementioning

confidence: 99%

Research Progress on the Microfracture of Shale: Experimental Methods, Microfracture Propagation, Simulations, and Perspectives

Zhang,

Cui,

Chen

et al. 2024

Applied Sciences

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The fracture network generated by hydraulic fracturing in unconventional shale reservoirs contains numerous microfractures that are connected to macroscopic fractures. These microfractures serve as crucial pathways for shale gas to flow out from micro- and nano-scale pores, playing a critical role in enhancing shale gas recovery. Currently, more attention is being given by academia and industry to the evolution of macroscopic fracture networks, while the understanding of the microfracture mechanisms and evolution is relatively limited. A significant number of microfractures are generated during the hydraulic fracturing process of shale. These microfractures subsequently propagate, merge, and interconnect to form macroscopic fractures. Therefore, studying the fracture process of rock masses from a microscale perspective holds important theoretical significance and engineering value. Based on the authors’ research experience and literature review, this paper provides a brief overview of current progress in shale microfracture research from five aspects: in situ observation experiments of microfractures in shale, formation and evolution processes of discontinuous microfractures, the impact of inhomogeneity on microfracture propagation, measurement methods for microscale mechanical parameters and deformation quantities in shale, and numerical simulation of shale microfractures. This paper also summarizes the main challenges and future research prospects in shale microfracture studies, including: (1) quantitative characterization of in situ observation experimental data on shale microfractures; (2) formation and evolution laws of macroscopic, mesoscopic, and microscopic multi-scale discontinuous fractures; (3) more in-depth and microscale characterization of shale heterogeneity and its deformation and fracture mechanisms; (4) acquisition of shale micro-mechanical parameters; (5) refinement and accuracy improvement of the numerical simulation of microfractures in shale. Addressing these research questions will not only contribute to the further development of microfracture theory in rocks but also provide insights for hydraulic fracturing in shale gas extraction.

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Section: Microscale Fracture Simulation In Shalementioning

confidence: 99%

Research Progress on the Microfracture of Shale: Experimental Methods, Microfracture Propagation, Simulations, and Perspectives

Zhang,

Cui,

Chen

et al. 2024

Applied Sciences

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Study on macro–micro mechanical behavior of rock like samples with hole and cracks

Huang,

Qiao,

Chang

et al. 2023

Comp. Part. Mech.

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Sandstone Modeling under Axial Compression and Axisymmetric Lateral Pressure

Kolesnikov

Gavrilov

2022

Symmetry

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The problems of the mechanical state of rocks and other brittle materials are studied from different sides in a large number of publications, the flow of which does not weaken with time, which is explained by the relevance and complexity of these problems. Quantitative values of strength and other characteristics of such materials can be obtained experimentally or using numerical and analytical models. This work is aimed at developing an analytical model for analyzing the state of brittle material on the example of sandstone under axial compression and axisymmetric proportional lateral pressure. The research uses methods of modeling mechanical systems based on the basic ideas of fracture mechanics. For axial compression with proportional lateral pressure, the equation of the load–strain curve is obtained, and the functions of residual life and damage are justified; effective stresses and effective modulus of elasticity are determined; a calculation algorithm and examples of its application are given. The results of the simulation are consistent with the experimental data known from the literature. The results obtained to a certain extent clarify the understanding of the mechanism of rock damage and destruction under axial compression with lateral pressure.

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Investigation into Macro- and Microcrack Propagation Mechanism of Red Sandstone under Different Confining Pressures Using 3D Numerical Simulation and CT Verification

Cited by 3 publications

References 32 publications

Research Progress on the Microfracture of Shale: Experimental Methods, Microfracture Propagation, Simulations, and Perspectives

Research Progress on the Microfracture of Shale: Experimental Methods, Microfracture Propagation, Simulations, and Perspectives

Study on macro–micro mechanical behavior of rock like samples with hole and cracks

Sandstone Modeling under Axial Compression and Axisymmetric Lateral Pressure

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