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

Hongbin Li, Dongyin Li, Weiyu Zhang, Huamin Li, Shen Wang, Hao Wang, Xiaokai Xu and Zhenfeng Li
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Hongbin Li: School of Energy Science and 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
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

Energies, 2021, vol. 14, issue 9, 1-17

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.

Keywords: top-coal caving; numerical damping; dynamic relaxation approach (DRA); particle element method (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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