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Dynamic Tensile Strength of Dry and Saturated Hard Coal under Impact Loading

Author

Listed:
  • Xianlei Zhu

    (School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China)

  • Qing Li

    (School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China)

  • Guihua Wei

    (School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China)

  • Shizheng Fang

    (School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China)

Abstract

To evaluate the influence of water content on the hard coal dynamic behavior, the dynamic tensile properties of saturated coal Brazilian disk (BD) samples were studied using a split Hopkinson pressure bar system, and dry samples were also tested as a control group. In the range of impact speeds studied, the tensile strength of the saturated coal is lower than that of the dry specimen. A synchronized triggering high-speed camera was used to monitor the deformation and failure process of dry and saturated coal samples, allowing analysis of the failure stages and mechanism of dynamic BD test, the broken mode was classified into three types, which can be classified into unilateral tensile failure, bilateral or multilateral tensile failure, and shear failure. Finally, fragments smaller than 5 mm in diameter were statistically analyzed. There is less debris in range of 0–5.0 mm for the saturated coal sample than for the dry coal. This study provides some information about the dynamic response of the hard coal for the relevant practical engineering.

Suggested Citation

  • Xianlei Zhu & Qing Li & Guihua Wei & Shizheng Fang, 2020. "Dynamic Tensile Strength of Dry and Saturated Hard Coal under Impact Loading," Energies, MDPI, vol. 13(5), pages 1-14, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:5:p:1273-:d:330530
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    References listed on IDEAS

    as
    1. Kaiwen Xia & Sheng Huang & Ajay Kumar Jha, 2010. "Dynamic Tensile Test of Coal, Shale and Sandstone Using Split Hopkinson Pressure Bar: A Tool for Blast and Impact Assessment," International Journal of Geotechnical Earthquake Engineering (IJGEE), IGI Global, vol. 1(2), pages 24-37, July.
    2. Tianshou Ma & Nian Peng & Zhu Zhu & Qianbing Zhang & Chunhe Yang & Jian Zhao, 2018. "Brazilian Tensile Strength of Anisotropic Rocks: Review and New Insights," Energies, MDPI, vol. 11(2), pages 1-25, January.
    3. Perera, M.S.A. & Ranjith, P.G. & Peter, M., 2011. "Effects of saturation medium and pressure on strength parameters of Latrobe Valley brown coal: Carbon dioxide, water and nitrogen saturations," Energy, Elsevier, vol. 36(12), pages 6941-6947.
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