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Study on the damage mechanism of granite containing prefabricated non-through joints

  • Research Article - Applied Geophysics
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Abstract

This study conducts uniaxial compression tests on granite samples with prefabricated fissures to investigate the damage mechanism of granite containing non-penetrating joints. These tests combine indoor experiments with three-dimensional discrete element numerical simulations. Stress–strain curves for the rock specimens and the microscopic crack extension mechanism are obtained under varying nodal configurations and by adjusting the inclination angle, penetration, and the number of prefabricated fissures. Results indicated that jointed rocks exhibit a more pronounced plastic deformation capacity than intact rocks when subjected to uniaxial compression. For rock mass strength, the strength of the jointed rock displays a parabolic trend, first decreasing and then increasing, with the increase in joint inclination angle. The minimum value is observed at an inclination angle of 20°–40°. In contrast, the strength of the jointed rock shows a consistent decline with the increasing joint penetration degree and joint count. For rock damage patterns, rock specimens with a nodal inclination angle of 0° primarily experience vertical shear and splitting tensile damage. As the inclination angle increases (0° < α < 90°), the specimens shift towards coplanar shear damage. However, when the joint inclination angle reaches 90°, the mode of failure shifts to a pure form of splitting tensile damage. Specimens with greater penetration lean more towards coplanar shear damage. As the number of nodal joints increases, the rocks transition from shear damage to mixed tensile-shear damage.

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Funding

Funding was provided by Science and Technology Tackling Programme of Henan Province, China (212102310282).

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Authors and Affiliations

  1. College of Geosciences and Engineering, North China University of Water Resources and Electric Power, Zhengzhou, China

    Wenjie Li, Jiangfeng Wang, Hanbing Wu & Chenbin Wang

  2. State Key Laboratory of Shield Machine and Boring Technology, Zhengzhou, China

    Zhenxing Yang

Authors
  1. Wenjie Li
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  2. Jiangfeng Wang
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  3. Zhenxing Yang
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  4. Hanbing Wu
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  5. Chenbin Wang
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Contributions

All authors contributed to the study conception and design. WL completed the writing of the full text, the design of the test, the preparation of the material, the implementation of the test, the analysis of the test data, the numerical simulation and all the modification work. WJ gave a comprehensive guidance to the paper. ZY guided the use of the test instrument. HW assisted Wenjie Li in conducting tests. CW assisted Wenjie Li in conducting tests. The first draft of the manuscript was written by Wenjie Li, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Wenjie Li.

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Conflict of interest

On behalf of all authors, the corresponding author states that there is no conflict of interest.

Additional information

Edited by Prof. Jadwiga Anna Jarzyna (ASSOCIATE EDITOR) / Prof. Gabriela Fernández Viejo (CO-EDITOR-IN-CHIEF).

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Li, W., Wang, J., Yang, Z. et al. Study on the damage mechanism of granite containing prefabricated non-through joints. Acta Geophys. (2024). https://doi.org/10.1007/s11600-024-01301-x

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  • DOI: https://doi.org/10.1007/s11600-024-01301-x

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