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Numerical Damping Calibration Study of Particle Element Method-Based Dynamic Relaxation Approach for Modeling Longwall Top-Coal Caving

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  • Hongbin Li

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
    College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

  • Dongyin Li

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

  • Weiyu Zhang

    (Zhaozhuang Coal Industry Co., Ltd., Jinneng Holding Group, Changzhi 046600, China)

  • Huamin Li

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

  • Shen Wang

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
    Postdoctoral Station of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

  • Hao Wang

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

  • Xiaokai Xu

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

  • Zhenfeng Li

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

Abstract

When using the explicit dynamic relaxation approach (DRA) to model the quasi-static rock breakage, fragmentation, and flow problems, especially the top-coal caving question, introducing numerical damping into the solution equation is inevitable for reducing the vibration frequency and impact speed of mesh nodes, which is significantly affect the fidelity of the computation results. Although the DRA has been widely adopted to simulate top-coal caving, the reasonable value and calibration method of numerical damping are still open issues. In this study, the calibration process of reasonable numerical damping for modeling top-coal caving is investigated by comparing with the experimental results, in which several geometry parameters of the drawing funnel are selected as the calibration indexes. The result shows that the most reasonable numerical damping value is 0.07 for the numerical modeling of interval top-coal caving in extra-thick coal seams. Finally, the correlation between the numerical damping and the physical top-coal drawing process is discussed. The numerical damping indirectly reflects the fragmentation in multi scale of coal mass and friction interaction between coal particles during the caving process, which reduces the vibration intensity of the top-coal caving system and dissipates the kinetic energy.

Suggested Citation

  • Hongbin Li & Dongyin Li & Weiyu Zhang & Huamin Li & Shen Wang & Hao Wang & Xiaokai Xu & Zhenfeng Li, 2021. "Numerical Damping Calibration Study of Particle Element Method-Based Dynamic Relaxation Approach for Modeling Longwall Top-Coal Caving," Energies, MDPI, vol. 14(9), pages 1-17, April.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:9:p:2348-:d:540320
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    References listed on IDEAS

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    1. Qunlei Zhang & Ruifu Yuan & Shen Wang & Dongyin Li & Huamin Li & Xuhe Zhang, 2020. "Optimizing Simulation and Analysis of Automated Top-Coal Drawing Technique in Extra-Thick Coal Seams," Energies, MDPI, vol. 13(1), pages 1-20, January.
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