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Mechanical Behaviors and Precursory Characteristics of Coal-Burst in Deep Coal Mining for Safety-Sustainable Operations: Insights from Experimental Analysis

Author

Listed:
  • Xiaoran Wang

    (State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology, Xuzhou 221116, China)

  • Jinhua Wang

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

  • Xin Zhou

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

  • Xiaofei Liu

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

  • Shuxin Liu

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

Abstract

Coalburst, a frequent and severe dynamic disaster, poses significant challenges to the safety and sustainable development of coal mines during deep excavation. To investigate the mechanical behaviors and precursory characteristics of coalburst subjected to in situ stress conditions, multiaxial cyclic loading experiments were conducted on cubic coal specimens, and the effects of different confining pressures on the mechanical parameters and energy evolution were analyzed. Acoustic emission (AE) technology was utilized to study the accumulation process of stress-induced damage and identify the source modes of microcracks. Then, nonlinear fractal theory and critical slowing theory were used to investigate the time-varying precursory characteristics of catastrophic failure in coalburst. The results show that as the confining pressure increases, the coal samples exhibit higher levels of elastic strain energy and dissipative energy, indicating an enhancement of plasticity. The AE count and accumulated energy show a strong correlation with cyclic loads. With an increasing number of cycles, the AE Felicity ratio gradually decreases, indicating a progressive increase in irreversible damage. Shear-mode microcracks also become more prominent with applied stress and confining pressures, as supported by varying AF/RA values of AE signals. The AE signals also follow the Hurst statistical law, and increasing applied stress and confining pressure strengthen this statistical pattern with a higher Hurst index. Throughout the cyclic loading process, certain AE varying trends were observed: the autocorrelation coefficient increased, the fractal dimension gradually decreased, and the variance suddenly increased. These trends serve as early, middle, and short–imminent warning signals, respectively, for the catastrophic failure of the loaded coal sample. These research findings contribute to a deeper understanding of coal failure evolution and provide a basis for early detection and warning of coalburst disasters, which are also essential for promoting the safe and sustainable development of deep coal mining operations.

Suggested Citation

  • Xiaoran Wang & Jinhua Wang & Xin Zhou & Xiaofei Liu & Shuxin Liu, 2024. "Mechanical Behaviors and Precursory Characteristics of Coal-Burst in Deep Coal Mining for Safety-Sustainable Operations: Insights from Experimental Analysis," Sustainability, MDPI, vol. 16(5), pages 1-20, March.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:5:p:2103-:d:1350506
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    References listed on IDEAS

    as
    1. Xiangguo Kong & Mengzhao Zhan & Yuchu Cai & Pengfei Ji & Di He & Tianshuo Zhao & Jie Hu & Xi Lin, 2023. "Precursor Signal Identification and Acoustic Emission Characteristics of Coal Fracture Process Subjected to Uniaxial Loading," Sustainability, MDPI, vol. 15(15), pages 1-17, July.
    2. Du, Xuanhong & Xue, Junhua & Shi, Yu & Cao, Chen-Rui & Shu, Chi-Min & Li, Kehan & Ma, Qian & Zhan, Keliang & Chen, Zhiheng & Wang, Shulou, 2023. "Triaxial mechanical behaviour and energy conversion characteristics of deep coal bodies under confining pressure," Energy, Elsevier, vol. 266(C).
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