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Investigations of Damage Characteristics in Rock Material Subjected to the Joint Effect of Cyclic Loading and Impact

Author

Listed:
  • Yanlong Chen

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Haoshuai Wu

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Hai Pu

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China
    College of Mining Engineering and Geology, Xinjiang Institute of Engineering, Urumqi 830091, China)

  • Kai Zhang

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Feng Ju

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Yu Wu

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Jiangfeng Liu

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China)

Abstract

Investigation of the damage characteristics of rock material under the combined effect of cyclic load and impact load is extremely crucial for many mining engineering applications. Based on energy dissipation theory, we considered factors such as circulation times, the cyclic stress of a uniaxial cyclic load test, and the impact pressure (strain rate) of a split Hopkinson pressure bar (SHPB) test, studying the damage mechanism of red sandstone under the combined action of a uniaxial cyclic and impact loads. We found that when the load stress is 60%, 70%, and 80% of the uniaxial compressive strength (UCS) of red sandstone, the stress can still promote the development of microcracks and the generation of new cracks in the rock, increasing the inner damage of the rock so that it reduces the rock strength. As the cyclic time increases, the energy dissipation ratio presented a trend of decreasing dramatically and then maintaining basically no change, and the peak strain and the damage variable of the rock both increased first and then tended to remain relatively constant. The damage variable of the rock specimen under the combined action of the uniaxial cyclic loading and impact load had a significant corresponding relationship with the initial damage. As the rock specimen initial damage increases, the damage variable and the peak stress of the rock specimen both decreases almost linearly with initial damage. Meanwhile, the average particle diameter of the rock specimen after breakage gradually increased, showing a positively correlated tendency. The ratio between the fragment quality of the bigger particle diameter in the total rock specimen quality gradually increased. Under the conditions of the same initial damage, a higher impact pressure resulted in smaller rock fragment average particle diameters.

Suggested Citation

  • Yanlong Chen & Haoshuai Wu & Hai Pu & Kai Zhang & Feng Ju & Yu Wu & Jiangfeng Liu, 2020. "Investigations of Damage Characteristics in Rock Material Subjected to the Joint Effect of Cyclic Loading and Impact," Energies, MDPI, vol. 13(9), pages 1-21, May.
  • Handle: RePEc:gam:jeners:v:13:y:2020:i:9:p:2154-:d:352817
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    Citations

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    Cited by:

    1. Haoshuai Wu & Haibo Bai & Yanlong Chen & Hai Pu & Kai Zhang, 2020. "Mechanical Properties and Damage in Lignite under Combined Cyclic Compression and Shear Loading," Sustainability, MDPI, vol. 12(20), pages 1-21, October.
    2. Sergey Zhironkin & Michal Cehlár, 2021. "Coal Mining Sustainable Development: Economics and Technological Outlook," Energies, MDPI, vol. 14(16), pages 1-8, August.

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