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Experimental Study on Uniaxial Compression Mechanics and Failure Characteristics of Non-Through Fractured Rock

Author

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  • Weijian Yu

    (Hunan Province Key Laboratory of Coal Resources Clean-Utilization and Mine Environment Protection, Hunan University of Science and Technology, Xiangtan 411201, China
    School of Resource & Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
    Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines, Hunan University of Science and Technology, Xiangtan 411201, China)

  • Hanxiao Guo

    (School of Resource & Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, China)

  • Ke Li

    (School of Resource & Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, China)

  • Bao Pan

    (School of Resource & Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, China)

Abstract

The stability of damaged rock mass is a critical problem in the control of surrounding rock in underground engineering. As the main macroscopic defect of rock surrounding engineering, it is of great significance to study its propagation mechanism and the experimental characteristics of rock mechanics. Surface-fractured rock mass is a typical representative of three-dimensional fracture. To reveal the failure mechanism of surface-fractured rock mass, a three-dimensional mechanical failure model of a surface-fractured rock specimen was established, including the initiation, crack propagation, and cooperative deformation of the rock micro-element. Taking the depth of the surface horizontal fissure as a variable, standard rock specimens with surface horizontal fissures of different depths were prepared, and an experimental study of surface-fractured rock specimens was carried out. The RMT rock mechanics test system was used to perform uniaxial compression tests on standard specimens containing fractured rock specimens of different depths. The complete stress–strain curves of samples with different fracture depths were obtained, and the influence of different fracture depths on rock strength and deformation characteristics was analyzed. The crack initiation, propagation, and failure modes of the specimens under uniaxial compression were analyzed based on high-speed camera technology. Through the combination of 3D image processing and acoustic emission monitoring, differences between failure before and after the peak in both asymmetrically damaged rock specimens and symmetrically damaged rock specimens were found. The mechanism of weak strength and weak stability of asymmetrically damaged rock specimens after the peak was explained theoretically. The research results showed that the existence of the horizontal joint plane directly led to a significant reduction in the strength of the jointed rock sample, and the fracture depth played an important role in controlling the failure mode of the jointed rock specimens. The uniaxial compression of rock specimens with horizontal non-penetrating surface fissures produced three-dimensional failure modes, and the depth of surface fissures changed the failure mode of the specimens under uniaxial compression. As the crack depth increased, the failure mode of the specimen changed from tensile failure to shear failure. The surface crack sample showed regional asymmetric failure and poor structural stability.

Suggested Citation

  • Weijian Yu & Hanxiao Guo & Ke Li & Bao Pan, 2023. "Experimental Study on Uniaxial Compression Mechanics and Failure Characteristics of Non-Through Fractured Rock," Sustainability, MDPI, vol. 15(6), pages 1-15, March.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:6:p:4968-:d:1093849
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    References listed on IDEAS

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    1. Huadan Fan & Yuefeng Lu & Yulong Hu & Jun Fang & Chengzhe Lv & Changqing Xu & Xinyi Feng & Yanru Liu, 2022. "A Landslide Susceptibility Evaluation of Highway Disasters Based on the Frequency Ratio Coupling Model," Sustainability, MDPI, vol. 14(13), pages 1-17, June.
    2. Zhigang Yuan & Jintao Zhao & Shuqing Li & Zehua Jiang & Fei Huang, 2022. "A Unified Solution for Surrounding Rock of Roadway Considering Seepage, Dilatancy, Strain-Softening and Intermediate Principal Stress," Sustainability, MDPI, vol. 14(13), pages 1-18, July.
    3. Hai Wu & Qian Jia & Weijun Wang & Nong Zhang & Yiming Zhao, 2021. "Experimental Test on Nonuniform Deformation in the Tilted Strata of a Deep Coal Mine," Sustainability, MDPI, vol. 13(23), pages 1-14, November.
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