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Numerical Study on Strength and Failure Behavior of Rock with Composite Defects under Uniaxial Compression

Author

Listed:
  • Xiaofei Wang

    (School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China)

  • Zhiguo Xia

    (School of Mining Engineering, University of Science and Technology Liaoning, Anshan 114051, China)

  • Peng Li

    (State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China)

  • Hongning Liu

    (Shandong Jinzhou Mining Group Limited Corporation, Weihai 264500, China)

Abstract

The cracks and holes in underground engineering are the critical factors that cause the instability of the surrounding rock. It is helpful to control the stability of surrounding rock to study the samples with combined defects of cracks and holes. In this study, PFC 2D is used to analyze the numerical models. Seven combined models of single circular hole and double cracks with different angles are established, and the fracture angle varies from 0° to 90° with an interval of 15°. First, uniaxial compression experiments and numerical simulations are carried out in the 0° defect combination model, and the microscopic parameters of PFC 2D are determined. Then, the numerical simulations of seven defect models under uniaxial compression are carried out, and the crack development law and acoustic emission characteristics of different defect combination models are studied. The failure modes, mechanical behavior, and stress states are studied. The displacement vector distributions of different defect combination models are analyzed; it is found that there are three main types of macro cracks in the defect combination samples. The results show that the combined defects reduce the strength of the model. Meanwhile, the distributions of the stress and displacement are changed by the cracks with different angles in the defective models.

Suggested Citation

  • Xiaofei Wang & Zhiguo Xia & Peng Li & Hongning Liu, 2021. "Numerical Study on Strength and Failure Behavior of Rock with Composite Defects under Uniaxial Compression," Energies, MDPI, vol. 14(15), pages 1-16, July.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:15:p:4418-:d:599166
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    Citations

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    Cited by:

    1. Xiaowei Guo & Xigui Zheng & Peng Li & Rui Lian & Cancan Liu & Niaz Muhammad Shahani & Cong Wang & Boyang Li & Wenjie Xu & Guowei Lai, 2021. "Full-Stress Anchoring Technology and Application of Bolts in the Coal Roadway," Energies, MDPI, vol. 14(22), pages 1-24, November.
    2. Yulong Chen & Junwen Zhang & Jianhang Chen & Xuejie Deng, 2022. "Special Issue: Rock Burst Disasters in Coal Mines," Energies, MDPI, vol. 15(13), pages 1-6, July.

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