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Comparison of Energy Evolution Characteristics of Intact and Fractured Coal under True Triaxial Progressive Stress Loading

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  • Yubing Liu

    (School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
    Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology, Ministry of Education, Xuzhou 221116, China)

  • Dong Zhao

    (School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
    Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology, Ministry of Education, Xuzhou 221116, China)

  • Shan Yin

    (School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
    Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology, Ministry of Education, Xuzhou 221116, China)

  • Li Zhang

    (School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
    Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology, Ministry of Education, Xuzhou 221116, China)

Abstract

The underground coal mining process is closely associated with frequent energy storage and consumption of coal mass with natural and induced fractures. Exploring the energy evolution characteristics of intact and fractured coal samples could be helpful for dynamic disaster control. In this study, laboratory true triaxial tests on the energy evolution characteristics of intact and fractured coal samples have been carried out and systematically discussed. The results show that the brittleness and peak strength are weakened due to the presence of macro-fractures in coal. The mean peak strength and brittleness for fractured coal are 29.00% and 74.59% lower than the intact coal samples. For both intact and fractured coal, the energy evolution curves are closely related to the deformation stages under true triaxial stresses. When subjected to the same intermediate stress, intact coal stores more elastic strain energy compared to fractured coal. Additionally, the rate of dissipative energy variation is two–three times lower in fractured coal samples compared to intact coal samples.

Suggested Citation

  • Yubing Liu & Dong Zhao & Shan Yin & Li Zhang, 2023. "Comparison of Energy Evolution Characteristics of Intact and Fractured Coal under True Triaxial Progressive Stress Loading," Sustainability, MDPI, vol. 15(20), pages 1-13, October.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:20:p:14796-:d:1258371
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    References listed on IDEAS

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    1. Geng, Weile & Huang, Gun & Guo, Shengli & Jiang, Changbao & Dong, Ziwen & Wang, Wensong, 2022. "Influence of long-term CH4 and CO2 treatment on the pore structure and mechanical strength characteristics of Baijiao coal," Energy, Elsevier, vol. 242(C).
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