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Influence of the Crack Angle on the Deformation and Failure Characteristics of Sandstone under Stepped Cyclic Uniaxial Compression with a Constant Lower Limit

Author

Listed:
  • Yuanmin Wang

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

  • Yunqiang Wang

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, School of Resources and Safety Engineering, Chongqing University, Chongqing 400044, China)

  • Song Luo

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

  • Hao Liu

    (College of Aerospace Engineering, Chongqing University, Chongqing 400044, China)

  • Guansheng Yi

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

  • Kang Peng

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

Abstract

Engineering rock structures containing joints and fissures are frequently subjected to discontinuous periodic disturbances of varying amplitudes. To attain the quantitative relationship between the crack angle and the mechanical and deformation properties of rock under complex stress paths, uniaxial cyclic loading and unloading tests with increasing stress gradients were conducted on sandstone specimens containing a single crack of different angles. Our results showed that the bearing capacity of the sandstone increased as the crack angle increased. The irreversible strain and elastic moduli of the rock presented a sudden increase when entering the next cycle of the stepped loading. However, the entire loading process can be divided into three stages according to their respective trends. These three stages correspond to the three stages of rock deformation, i.e., the pore crack compaction stage, the elastic deformation to the stable micro-elastic crack development stage, and the unstable crack development stage. In addition, the crack angle of sandstone showed a negative correlation with the irreversible strain, but a positive correlation with the elastic modulus. With the increasing crack angle, the failure mode of the rock changed from the tensile-shear failure to the shear failure, and then to the interlayer dislocation failure.

Suggested Citation

  • Yuanmin Wang & Yunqiang Wang & Song Luo & Hao Liu & Guansheng Yi & Kang Peng, 2023. "Influence of the Crack Angle on the Deformation and Failure Characteristics of Sandstone under Stepped Cyclic Uniaxial Compression with a Constant Lower Limit," Mathematics, MDPI, vol. 11(9), pages 1-19, May.
    • Handle: RePEc:gam:jmathe:v:11:y:2023:i:9:p:2187-:d:1140296
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    References listed on IDEAS

    as
    1. Bing Dai & Guifeng Zhao & Lei Zhang & Yong Liu & Zhijun Zhang & Xinyao Luo & Ying Chen, 2022. "Energy Dissipation of Rock with Different Parallel Flaw Inclinations under Dynamic and Static Combined Loading," Mathematics, MDPI, vol. 10(21), pages 1-22, November.
    2. Baoping Chen & Bin Gong & Shanyong Wang & Chun’an Tang, 2022. "Research on Zonal Disintegration Characteristics and Failure Mechanisms of Deep Tunnel in Jointed Rock Mass with Strength Reduction Method," Mathematics, MDPI, vol. 10(6), pages 1-20, March.
    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.
    Full references (including those not matched with items on IDEAS)

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