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Study on acoustic emission and X-ray computed-tomography characteristics of shale samples under uniaxial compression tests

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Abstract

The acoustic-emission (AE) nondestructive monitoring method was used to investigate the deformation–failure of Longmaxi marine shale samples from the Sichuan Basin in uniaxial compression tests. Millions of AE ring counts were recorded by six sensors that were mounted on the surface of cylindrical specimens. The AE ring counts rate and energy rate were applied to study crack development during fracturing. AE locations at different stress stages during the loading process were obtained to study the fracture spatial distribution and the crack-propagation tendency. An X-ray computed tomography (CT) system was used to scan samples after damage. CT images were reconstructed to acquire three-dimensional pictures that show the internal invisible-fault system. The combination of AE method and CT technique helps explain temporal and spatial crack evolution. Variable damage evolution was determined by the number of AE ring counts, which demonstrates the degradation behavior of shale.

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Acknowledgements

This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant number XDB10030302).

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Authors and Affiliations

  1. Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China

    Yuan Li, Lei Xue & Xiaowa Wu

  2. College of Earth Science, University of Chinese Academy of Sciences, Beijing, 100049, China

    Yuan Li & Xiaowa Wu

Authors
  1. Yuan Li
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  2. Lei Xue
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  3. Xiaowa Wu
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Correspondence to Yuan Li or Lei Xue.

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Li, Y., Xue, L. & Wu, X. Study on acoustic emission and X-ray computed-tomography characteristics of shale samples under uniaxial compression tests. Environ Earth Sci 78, 173 (2019). https://doi.org/10.1007/s12665-019-8185-4

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  • DOI: https://doi.org/10.1007/s12665-019-8185-4

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