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Experimental and Theoretical Study of Failure Characteristics of Rock Containing Single 3D Internal Open-Type Flaws

  • Research Article-Civil Engineering
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Abstract

A 3D internal open-type flaw inside gypsum rock-like specimens is prepared using a volume-loss method. It has three types of flaw inclinations and four types of flaw strike lengths. Uniaxial compression and acoustic emission monitoring tests show a small range of secondary local failures are initially distributed near the internal flaw. The area of these secondary failures remains stable and does not extend to other positions until the uniaxial compression strength status of specimens is reached. To explain the special test results, which have rarely been seen in previous 2D fractured rock studies, the surrounding rock of the internal open-type fracture is simplified as a rectangular board model with fixed boundary conditions on four sides. Theoretical calculations prove that a Destruction Region (secondary tensile failures) occurs in the central parts of the internal free surface as built from the internal flaw and is surrounded by a circular Anti-destruction Region. (The rock is under triaxial compression, and tensile failure cannot develop.) Once rock in the Anti-destruction Region reaches its triaxial compressive strength, the constraining effects on the secondary tensile failures disappear. These theoretical analysis results are consistent with experimental phenomena and provide an important reference for geotechnical engineering under similar conditions.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Numbers 51774020 and 51934003), the Program for Yunnan thousand talents plan high-level innovation and entrepreneurship team, and the Program for innovative research team (in Science and Technology) in University of Yunnan Province. Thanks for the guidance from Prof. Zach Agioutantis in the University of Kentucky, and thanks Ph.D. Congcong Chen for her assistance in laboratory tests. Thanks for the professional English editing from the Charlesworth Group.

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Authors and Affiliations

  1. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Yusong Zhao, Yongtao Gao & Shunchuan Wu

  2. Department of Mining Engineering, University of Kentucky, Lexington, KY, 40506, USA

    Yusong Zhao

  3. Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming, 650093, Yunnan, China

    Shunchuan Wu

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  1. Yusong Zhao
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Correspondence to Yusong Zhao or Shunchuan Wu.

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Zhao, Y., Gao, Y. & Wu, S. Experimental and Theoretical Study of Failure Characteristics of Rock Containing Single 3D Internal Open-Type Flaws. Arab J Sci Eng 46, 5071–5088 (2021). https://doi.org/10.1007/s13369-020-05250-7

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  • DOI: https://doi.org/10.1007/s13369-020-05250-7

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