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The Coupled Influence of Surface and Internal Crack Propagation on Rock Breakages by Indentations in Biaxial States

  • Research Article - Civil Engineering
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Abstract

To investigate the coupled influence of surface and internal crack propagation on rock breakages, indentation tests in biaxial states were conducted to generate various internal cracks and surface cracks that may determine the rock breakages between indenters. Crack observation shows that the increase in the maximum confinement (\(\sigma _{1})\) promotes surface crack propagation when the minimum confinement (\(\sigma _{2})\) is fixed; simultaneously, the initiation and the deflection angle of internal cracks increase. The increase in \(\sigma _{2}\) when \(\sigma _{1}\) is fixed restrains surface crack propagation, but hardly influences internal crack propagation. In addition, the propagation tendency of internal cracks in tests agrees well with previous studies and the tendency of surface crack propagation is validated by a theoretical analysis. Moreover, the following analysis demonstrates that the effective connection by internal cracks and the sufficient incisions by surface cracks significantly determine the chip and the groove formation. Obtained groove volumes indicate that groove volumes are positively related to the surface crack propagation.

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Acknowledgements

The authors would like to express their gratitude to Reviewers and Editors for the hard work and beneficial comments on this study. Thanks Doctor Yu Chen for the suggestions in revision. The authors would like to acknowledge these financial supports: the Doctoral science fund in Hunan Institute of Engineering; the Postdoctoral science foundation in Hunan University of Science and Technology; Project (2016CX016) supported by Innovation Driven Plan of Central South University; and Projects supported by China Postdoctoral Science Foundation (2017M612557).

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Authors and Affiliations

  1. Department of Building Engineering, Hunan Institute of Engineering, Xiangtan, China

    Jie Liu & Jun Wang

  2. School of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan, China

    Jie Liu, Wen Wan & Yanlin Zhao

Authors
  1. Jie Liu
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  2. Jun Wang
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  3. Wen Wan
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  4. Yanlin Zhao
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Correspondence to Jie Liu or Jun Wang.

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Liu, J., Wang, J., Wan, W. et al. The Coupled Influence of Surface and Internal Crack Propagation on Rock Breakages by Indentations in Biaxial States. Arab J Sci Eng 43, 5067–5077 (2018). https://doi.org/10.1007/s13369-017-2930-3

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  • DOI: https://doi.org/10.1007/s13369-017-2930-3

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