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Compaction characteristics and energy dissipation of crushed gangue with different particle sizes under mining stress

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Abstract

Compaction properties of the backfill body are the key to reveal the law of roof subsidence and illustrate the mechanism of ground pressure control with gangue backfill mining. A rock mechanic testing machine and a self-designed steel cylinder were applied to conduct compaction experiments of gangue with different particle sizes, axial stresses, loading rates decided by actual mining stress in goaf. The characteristics of stress–strain, fractal dimension and energy dissipation for crushed gangue were analyzed. The stress–strain relationship of crushed gangue in the compaction process increases exponentially and can be divided into void compaction stage, structure adjustment stage and elastoplastic deformation stage. The fractal dimension will increase with the increase of axial stress, and decrease with the increase of loading rate. The energy dissipation in the process of gangue sample compaction depends on the stress–strain characteristics, that is resistance to axial deformation. Based on the experimental results, gangue particle size gradation has a more significant influence on compaction characteristics of gangue more than axial stress and loading rate. The axial strain caused by particle size ranges from 0.19 to 0.51, and the energy dissipation exceeds the range of 5 times, which are far beyond the influence of other factors.

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Acknowledgements

Financial support for this work was provided by the Natural Science Research Project of Anhui Educational Committee (No. 2022AH050839), the National Natural Science Foundation of China (52104155, 52130402), the Scientific Research Foundation for High-level Talents of Anhui University of Science and Technology (2021yjrc11) and the Open Research Grant of Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining (Grant NO. EC2022012).

Funding

Natural Science Research Project of Anhui Educational Committee (2022AH050839); National Natural Science Foundation of China (52104155, 52130402); Scientific Research Foundation for High-level Talents of Anhui University of Science and Technology (2021yjrc11).

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Authors and Affiliations

  1. School of Mining Engineering, Anhui University of Science and Technology, Huainan, 232001, Anhui, China

    Xiang He, Shuxin He, Ke Yang & Zhen Wei

  2. National and Local Joint Engineering Research Center of Precision Coal Mining, Huainan, 232001, Anhui, China

    Ke Yang & Cun Zhang

  3. State Key Laboratory of Mining-induced Response and Disaster Prevention and Control in Deep Coal Mines, Huainan, 232001, China

    Bin Liu

  4. School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, China

    Cun Zhang

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  1. Xiang He
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  2. Shuxin He
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  4. Zhen Wei
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  5. Bin Liu
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Contributions

X.H. and C.Z. performed the parameter design, participated in the test, and drafted the manuscript. K.Y., Z.W., B.L. and S.H. conducted the field measurement and conceived of, designed, and coordinated the study.

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Correspondence to Cun Zhang.

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He, X., He, S., Yang, K. et al. Compaction characteristics and energy dissipation of crushed gangue with different particle sizes under mining stress. Environ Earth Sci 82, 310 (2023). https://doi.org/10.1007/s12665-023-11011-0

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