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Energy Evolution of Coal During Uniaxial Compression under Different Bedding Intersection Angles and its Controlling Effect on the Failure Process

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Abstract

Energy evolution is of great significance for exposing the failure mechanism of coal reservoirs and evaluating the fracturing effect. This study conducted uniaxial compression experiments with bedding intersection angle (θ) as a variable, calculated the energy and analyzed their controlling effects on coal deformation, failure and brittleness. The results show that, with increase in θ, the failure mode of coal changes from tensile fracture to shear failure, and the strength, elastic energy (Ue) and total energy (U) of coal all show a trend of first decreasing and then increasing. Based on the comprehensive criteria of the elastic energy ratio (Ue/U) and stress–strain curve, a new division method of the compression stage is proposed, and the determination of the critical point between stages can avoid the influence of human subjective factors. The transformation of Ue and external loads jointly provides the energy source for the release of dissipated energy (Ud). Ue is the main energy type in the pre-peak stage, and a significant amount of energy is converted into Ud in the failure stage. A new brittleness index was constructed by utilizing the relationship between Ue and Ud. It was found that brittleness is negatively correlated with θ and positively correlated with Ue/U at the peak point. A model of the mechanical strength of coal with structured planes has been constructed and validated by experimental data, which can be used to analyze the effect of structural planes on coal strength. When the hydraulic fracturing direction is parallel or at a low angle to the bedding plane, it is favorable for the formation of extensive fractures.

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All data generated or analyzed during this study are included in this published article.

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Funding

This work was supported by the National Natural Science Foundation of China (42372182, 42130802), a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions, Qian Science Cooperation Project of Prospecting Strategy ([2022]ZD001–001, [2022]ZD001–003), National Natural Science Foundation of Ningxia (2023AAC05062), the Fundamental Research Funds for the Central Universities (2023XSCX002), the Graduate Innovation Program of China University of Mining and Technology (2023WLKXJ002) and the Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX23_2759).

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Authors and Affiliations

  1. Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou, 221008, Jiangsu, China

    Xiaojie Fang, Caifang Wu & Ningning Liu

  2. School of Resources and Geosciences, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China

    Xiaojie Fang, Caifang Wu & Ningning Liu

  3. School of Chemical Engineering, The University of Queensland, St Lucia, Brisbane, QLD, 4072, Australia

    Hewei Zhang

  4. School of Civil and Resource Engineering, The University of Western Australia, Perth, WA, 6012, Australia

    Xiuming Jiang

  5. School of Resources and Environmental Engineering, Inner Mongolia University of Technology, Hohhot, 010051, Inner Mongolia, China

    Geng Li

  6. Coal Geology Bureau of Ningxia Hui Autonomous Region, Yinchuan, 750002, China

    Zhifeng Zhang

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  1. Xiaojie Fang
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Correspondence to Caifang Wu.

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Fang, X., Wu, C., Zhang, H. et al. Energy Evolution of Coal During Uniaxial Compression under Different Bedding Intersection Angles and its Controlling Effect on the Failure Process. Nat Resour Res 33, 813–830 (2024). https://doi.org/10.1007/s11053-024-10309-5

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