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Study on Mechanical Characteristics and Failure Modes of Coal–Mudstone Combined Body with Prefabricated Crack

Author

Listed:
  • Huayong Lv

    (School of Architecture and Engineering, Shangqiu Normal University, Shangqiu 476000, China
    These authors contributed equally to this work.)

  • Defeng Wang

    (Institute of Mining and Special Civil Engineering, Technical University Bergakademie Freiberg, 09599 Freiberg, Germany)

  • Zhanbo Cheng

    (School of Engineering, University of Warwick, Coventry CV4 7AL, UK)

  • Yaning Zhang

    (China Coal Research Institute, Beijing 100013, China
    These authors contributed equally to this work.)

  • Tao Zhou

    (School of Foreign Languages, Shangqiu Normal University, Shangqiu 476000, China)

Abstract

There are normally pre-existing cracks that can be observed in the coal seam and immediate roof that influences the stability of the rib spalling and the movement law of overlying strata. In this study, comprehensive research methods (e.g., theory analysis, experimental tests and numerical simulations) were adopted to reveal the mechanical characteristics, acoustic emission behaviors and failure modes of a coal–mudstone combined body with a single prefabricated non-penetrating crack. The results show that the influence of the crack angle on the elastic modulus of the coal–mudstone combined body samples was limited. With the increase in the crack angle, the unconfined compressive strength of samples decreased first and then increased in a V-shaped trend. In addition, the minimum unconfined compressive strength could be observed at a crack angle of 45°. Moreover, the number of acoustic emissions significantly increased with the process of continuous loading. In addition, the stress reduction zone could be observed in both ends of the prefabricated cracks at the initial stage of loading. The high- and low-stress zones were transformed with the process of continuous loading. Under an unconfined compression test, the failure models of the coal body part in the samples were mainly caused by shear failure, and only a few cracks occurred in the upper tip of the prefabricated cracks of the mudstone part. Therefore, airfoil cracks could be observed in the samples due to the strength difference of the coal mass and mudstone.

Suggested Citation

  • Huayong Lv & Defeng Wang & Zhanbo Cheng & Yaning Zhang & Tao Zhou, 2022. "Study on Mechanical Characteristics and Failure Modes of Coal–Mudstone Combined Body with Prefabricated Crack," Mathematics, MDPI, vol. 10(2), pages 1-18, January.
    • Handle: RePEc:gam:jmathe:v:10:y:2022:i:2:p:177-:d:719557
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    References listed on IDEAS

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    1. Yu Xiong & Dezhong Kong & Zhanbo Cheng & Zhijie Wen & Zhenqian Ma & Guiyi Wu & Yong Liu, 2021. "Instability Control of Roadway Surrounding Rock in Close-Distance Coal Seam Groups under Repeated Mining," Energies, MDPI, vol. 14(16), pages 1-19, August.
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    Cited by:

    1. Feiyue Wang & Xin Xie & Zhongwei Pei & Longjun Dong, 2022. "Anomalous Areas Detection in Rocks Using Time-Difference Adjoint Tomography," Mathematics, MDPI, vol. 10(7), pages 1-20, March.
    2. Renhui Cheng & Chao Zhang & Fuhuai Fan & Chenye Duan & Zhiheng Chen, 2023. "Research on Hole Collapse Monitoring Technology of Coal Seam Gas Extraction Boreholes," Sustainability, MDPI, vol. 15(13), pages 1-13, June.
    3. Yuqi Shang & Dezhong Kong & Shijiang Pu & Yu Xiong & Qiang Li & Zhanbo Cheng, 2022. "Study on Failure Characteristics and Control Technology of Roadway Surrounding Rock under Repeated Mining in Close-Distance Coal Seam," Mathematics, MDPI, vol. 10(13), pages 1-18, June.

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