Abstract
In order to construct a numerical simulation model that can reflect the bedding structure of real shale samples, CT scanning and digital image processing were utilized to analyze the intricate internal structure of the shale. By integrating this information with RFPA3D finite element software, a 3D non-uniform numerical model that can accurately represent the shale bedding structure was built and simulated for direct tensile tests. The experimental findings demonstrated that shale possesses noticeable anisotropic properties with regard to tensile strength. Two distinct modes of damage were observed in shale specimens subjected to uniaxial tensile loading: tensile damage along the bedding plane and damage occurring perpendicular to the bedding plane. The spatial distribution characteristics of the acoustic emission points better reflect the damage pattern of the specimen, and the acoustic emission counting evolution characteristics are closely related to the damage process of the specimen. These research findings shed light on the fracture damage mechanism of shale formations, thereby contributing to a better understanding of the engineering stability evaluation for rock bodies. Furthermore, they offer a novel perspective for investigating the evolution of damage in rock particles.
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Acknowledgements
This research was funded by the National Natural Science Foundation of China, grant numbers 51964007, 51774101 and 52104080, Guizhou Science and Technology Fund, Grant Number [2020]4Y046, [2019]1075, and [2018]1107.
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Wu, Z., Yang, Y., Zuo, Y. et al. Damage evolution characteristics of 3D reconstructed bedding-containing shale based on CT technology and digital image processing. Acta Geophys. (2023). https://doi.org/10.1007/s11600-023-01228-9
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DOI: https://doi.org/10.1007/s11600-023-01228-9