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Mechanical mechanism of rib spalling and sensitivity analysis of gangue parameters to rib spalling in gangue-bearing coal seams

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Abstract

Rib spalling is one of the main factors restricting the safe and efficient production of the fully mechanized mining face in gangue-bearing coal seams, and the gangue has significant influence on the occurrence of rib spalling. In this study, the instability process and mechanical mechanism of rib spalling in gangue-bearing coal seams were studied, and the sensitivity of gangue parameters to rib spalling was analyzed. The simulation test of rib spalling under different gangue parameters was carried out by orthogonal tests. The width and depth of rib spalling were taken as evaluation indexes, and the influence of gangue parameters on the rib spalling was analyzed by variance analysis and significance tests. The results show that the failure process of rib spalling is characterized by the fracturing failure of the lower coal body, shear failure of the gangue layer, and the falling off of the upper coal body caused by the gravity; the gangue parameters (thickness, density, joint inclination, and internal friction angle) have an important influence on the sliding instability of the coal wall. In the sensitivity analysis, the influence of gangue parameters on the width of rib spalling is ordered as gangue density > joint inclination > gangue thickness > internal friction angle; the influence of gangue parameters on the depth of rib spalling is ordered as gangue density > joint inclination > internal friction angle > gangue thickness. Besides, the greater the gangue density, the less damage caused by stress concentration, and the lower the risk of rib spalling.

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The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.

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Funding

This work was supported by the National Natural Science Foundation of China (grant No.52174073, No.51774110, No.U1904128, No.52004082).

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Authors and Affiliations

  1. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, 454000, Henan, China

    Guosheng Li, Zhenhua Li & Feng Du

  2. Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Jiaozuo, 454000, Henan, China

    Zhenhua Li & Feng Du

  3. School of Civil Engineering, Henan Polytechnic University, Jiaozuo, 454003, Henan, China

    Zhengzheng Cao

Authors
  1. Guosheng Li
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  2. Zhenhua Li
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  3. Feng Du
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  4. Zhengzheng Cao
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Contributions

Guosheng Li: conceptualization, methodology, formal analysis, writing—original draft. Zhenhua Li: formal analysis, review and editing. Feng Du: formal analysis. Zhengzheng Cao: formal analysis.

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Correspondence to Zhenhua Li.

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Responsible Editor: Shimin Liu

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Highlights

• This study ananlyzed the structural instability and failure process of gangue-bearing coal seams

• This study ananlyzed the mechanical mechanism of gangue parameters on the rib spalling of gangue-bearing coal seams

• Variance analysis and significance test are used to analyze the sensitivity of gangue parameters to the width and depth of rib spalling

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Li, G., Li, Z., Du, F. et al. Mechanical mechanism of rib spalling and sensitivity analysis of gangue parameters to rib spalling in gangue-bearing coal seams. Environ Sci Pollut Res 30, 38713–38727 (2023). https://doi.org/10.1007/s11356-022-25033-x

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  • DOI: https://doi.org/10.1007/s11356-022-25033-x

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