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Energy Evolution Characteristics of Water-Saturated and Dry Anisotropic Coal under True Triaxial Stresses

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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)

  • Enyuan Wang

    (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)

  • 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

During deep underground coal mining, water-injection-related engineering methods are generally carried out to reduce the hazards of coal dynamic disasters. The energy evolution characteristics of coal can better describe the deformation and failure processes, as it is more consistent with the in situ behavior of underground mining-induced coal. In this study, experimental efforts have been paid to the energy evolution characteristics of water-saturated and dry anisotropic coal under true triaxial stresses. The effects of water saturation, intermediate stress, and anisotropic weak planes of coal on the true triaxial energy evolution were systematically evaluated. The results show that the overall energy is weakened due to the water adsorption for water-saturated coal samples. The water-weakening effect on the overall energy of water-saturated coal is more pronounced when perpendicular to the bedding plane direction than in the other two cleat directions. The accumulation elastic energy anisotropy index of dry and water-saturated coal samples is higher than 100.00%. Both accumulation and residual elastic energy of dry and water-saturated coal samples show an increasing-then-decreasing trend with intermediate stress increase. The results obtained in this study help understand the in situ behavior of coal during deep underground mining and control coal dynamic disasters.

Suggested Citation

  • Yubing Liu & Enyuan Wang & Dong Zhao & Li Zhang, 2023. "Energy Evolution Characteristics of Water-Saturated and Dry Anisotropic Coal under True Triaxial Stresses," Sustainability, MDPI, vol. 15(2), pages 1-16, January.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:2:p:1431-:d:1032898
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    References listed on IDEAS

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    1. Qiangui Zhang & Xiangyu Fan & Yongchang Liang & Minghui Li & Guangzhi Li & Tianshou Ma & Wen Nie, 2017. "Mechanical Behavior and Permeability Evolution of Reconstituted Coal Samples under Various Unloading Confining Pressures—Implications for Wellbore Stability Analysis," Energies, MDPI, vol. 10(3), pages 1-19, March.
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