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Mechanical anisotropy associated with beddings in shale under Brazilian test conditions:Insights from acoustic emission statistics

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Journal of rock Mechanics and Geotechnical Engineering 2024年第11期16卷 4462-4479页

作者： Yongfa Zhang Yinlin Ji Yu Zhao Qinglin Deng Chaolin Wang College of Civil Engineering Guizhou UniversityGuiyang550025China Helmholtz Centre Potsdam GFZ German Research Centre for GeosciencesPotsdam14473Germany State Key Laboratory of Coal Mine Disaster Dynamics and Control School of Resource and Safety EngineeringChongqing UniversityChongqing400044China

A comprehensive understanding of shale’s bedding anisotropy is crucial for shale-related engineering activities,such as hydraulic fracturing,drilling and underground *** this study,seven Brazilian tests were conducted on shale samples at different bedding orientations with respect to the loading direction(0°,45°and 90°)and the disc end face(0°,45°and 90°).An acoustic emission(AE)system was employed to capture the evolution of damage and the temporal-spatial distribution of microcracks under splitting-tensile *** results show that the Brazilian tensile strength decreases with increasing bedding inclination with respect to the disc end face,while it increases with the angle between bedding and loading *** the bedding inclination with respect to the end face facilitates the reduction in b value and enhances the shale’s resistance to microcrack growth during the loading *** between the bedding orientation and the end face suppresses the growth of mixed tensile-shear microcracks,while reducing the bedding angle relative to the loading direction is beneficial for creating mixed tensile-shear and tensile *** observed microscopic failure characteristics are attributed to the competing effects of bedding activation and breakage of shale matrix at different bedding *** temporal-spatial distribution of microcracks,characterized by AE statistics including the correlation dimension and spatial correlation length,illustrates that the fractal evolution of microcracks is independent of bedding anisotropy,whereas the spatial distribution shows a stronger *** evolution features of correlation dimension and spatial correlation length could be potentially used as precursors for shale splitting *** findings may be useful for predicting rock mass instability and analyzing the causes of catastrophic rupture.

关键词： Bedding anisotropy Acoustic emission(AE) Shale Brazilian test rock failure mechanism Splitting-tensile cracks

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