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Mechanical behavior and failure analysis of brittle sandstone specimens containing combined flaws under uniaxial compression

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Abstract

Based on the axial stress-axial strain curves, the effect of fissure angle on the strength and deformation behavior of sandstone specimens containing combined flaws is analyzed. The mechanical parameters of sandstone specimens containing combined flaws are all lower than that of intact specimen, but the reduction extent is distinctly related to the fissure angle. The results of sandstone specimens containing combined flaws are obtained by the acoustic emission, which can be used to monitor the crack initiation and propagation. The ultimate failure mode and crack coalescence behavior are evaluated for brittle sandstone specimens containing combined flaws. Nine different crack types are identified on the basis of their geometry and crack coalescence mechanism (tensile crack, hole collapse, far-field crack and surface spalling) for combined flaws. The photographic monitoring was also adopted for uniaxial compression test in order to confirm the sequence of crack coalescence in brittle sandstone specimens containing combined flaws, which recorded the real-time crack coalescence process during entire deformation. According to the monitored results, the effect of crack coalescence process on the strength and deformation behavior is investigated based on a detailed analysis for brittle sandstone specimens containing combined flaws by using digital photogrammetry.

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Authors and Affiliations

  1. State Key Laboratory for Geomechanics and Deep Underground Engineering (China University of Mining and Technology), Xuzhou, 221008, China

    Sheng-qi Yang  (杨圣奇) & Hong-wen Jing  (靖洪文)

  2. Key Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province, Wuhan University, Wuhan, 430072, China

    Sheng-qi Yang  (杨圣奇)

  3. Center for Rock Instability & Seismicity Research, Northeastern University, Shenyang, 110819, China

    Tao Xu  (徐涛)

Authors
  1. Sheng-qi Yang  (杨圣奇)
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  2. Hong-wen Jing  (靖洪文)
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  3. Tao Xu  (徐涛)
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Corresponding author

Correspondence to Sheng-qi Yang  (杨圣奇).

Additional information

Foundation item: Project(2014CB046905, 2013CB36003) supported by the National Basic Research Program of China; Project(NCET-12-0961) supported by the Program for New Century Excellent Talents in University, China; Projects(51179189, 41272344) supported by the National Natural Science Foundation of China; Project(HBKLCIV201201) supported by the Open Research Fund Program of the Key Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province, China

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Yang, Sq., Jing, Hw. & Xu, T. Mechanical behavior and failure analysis of brittle sandstone specimens containing combined flaws under uniaxial compression. J. Cent. South Univ. 21, 2059–2073 (2014). https://doi.org/10.1007/s11771-014-2155-5

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  • DOI: https://doi.org/10.1007/s11771-014-2155-5

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