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Study on the Progressive Failure Characteristics of Longmaxi Shale under Uniaxial Compression Conditions by X-ray Micro-Computed Tomography

Author

Listed:
  • Xiao Li

    (Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China)

  • Yongting Duan

    (Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China)

  • Shouding Li

    (Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China)

  • Runqing Zhou

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

Abstract

To investigate the deformation-failure process of Longmaxi shale under uniaxial compression conditions from the mesoscopic and macroscopic points of view, novel X-ray microComputed Tomography (micro-CT) equipment combined with unique loading apparatus was used. Cylindrical shale samples (4 mm in diameter and 8 mm in height) were produced to perform a series of uniaxial compression tests. CT scanning images at different time points during the loading process were obtained to study the characteristics of the progressive failure. In addition, stereograms were reconstructed and vertical slices were selected to explain the failure mechanism. From the results of the testing the low-density area, local per-peak cracks, numerous post-peak cracks and secondary cracks consecutively appeared in the CT images. Vertical and inclined fissures in the samples could be observed from the stereograms’ surfaces and from internal slices. The cracking indicates that the failure process of shale is progressive and the failure mechanism of shale under uniaxial compression is mainly tension destruction or comprehensive tension-shear destruction.

Suggested Citation

  • Xiao Li & Yongting Duan & Shouding Li & Runqing Zhou, 2017. "Study on the Progressive Failure Characteristics of Longmaxi Shale under Uniaxial Compression Conditions by X-ray Micro-Computed Tomography," Energies, MDPI, vol. 10(3), pages 1-13, March.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:3:p:303-:d:92013
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    References listed on IDEAS

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    1. Tim Boersma & Corey Johnson, 2012. "The Shale Gas Revolution: U.S. and EU Policy and Research Agendas," Review of Policy Research, Policy Studies Organization, vol. 29(4), pages 570-576, July.
    2. Wang, Qiang & Li, Rongrong, 2016. "Natural gas from shale formation: A research profile," Renewable and Sustainable Energy Reviews, Elsevier, vol. 57(C), pages 1-6.
    3. J. David Hughes, 2013. "A reality check on the shale revolution," Nature, Nature, vol. 494(7437), pages 307-308, February.
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    Cited by:

    1. Yang Tang & Seisuke Okubo & Jiang Xu & Shoujian Peng, 2018. "Study on the Progressive Failure Characteristics of Coal in Uniaxial and Triaxial Compression Conditions Using 3D-Digital Image Correlation," Energies, MDPI, vol. 11(5), pages 1-13, May.
    2. Minyue Zhou & Yifei Zhang & Runqing Zhou & Jin Hao & Jijin Yang, 2018. "Mechanical Property Measurements and Fracture Propagation Analysis of Longmaxi Shale by Micro-CT Uniaxial Compression," Energies, MDPI, vol. 11(6), pages 1-18, May.

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