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Numerical Simulation of the Impact of Unmined Longwall Panel on the Working Stability of a Longwall Using UDEC 2D—A Case Study

Author

Listed:
  • Sylwester Rajwa

    (Department of Extraction Technologies, Rockburst and Risk Assessment, Central Mining Institute, Plac Gwarków 1, 40-166 Katowice, Poland)

  • Tomasz Janoszek

    (Department of Extraction Technologies, Rockburst and Risk Assessment, Central Mining Institute, Plac Gwarków 1, 40-166 Katowice, Poland)

  • Janina Świątek

    (Department of Extraction Technologies, Rockburst and Risk Assessment, Central Mining Institute, Plac Gwarków 1, 40-166 Katowice, Poland)

  • Andrzej Walentek

    (Department of Extraction Technologies, Rockburst and Risk Assessment, Central Mining Institute, Plac Gwarków 1, 40-166 Katowice, Poland)

  • Dominik Bałaga

    (KOMAG Institute of Mining Technology, Division of Machines and Devices, Pszczyńska 37, 44-100 Gliwice, Poland)

Abstract

The main goal of the paper is numerical simulation for investigation of damage causes in the working of a longwall located under the unmined longwall panel. The paper presents the results of model-based research on the stability of the roof of a longwall working in a zone subject to cave-in mining, taking into account the influence of mining conditions in the form of an unmined coal seam located 115 m above the exploited seam. It presents the geometry of the rock mass under study, the discretization area of the solution, and gives an overview of the assumptions used to build the numerical model. The authors discuss the results of numerical simulations of the influence of mining phenomena on the formation of roof falls in the longwall. Based on the results of numerical simulations, the process of identifying the size of roof falls in a longwall working (loss of stability) was carried out through their appropriate classification. The case presented and analyzed in this paper occurred in one of Poland’s coal mines.

Suggested Citation

  • Sylwester Rajwa & Tomasz Janoszek & Janina Świątek & Andrzej Walentek & Dominik Bałaga, 2022. "Numerical Simulation of the Impact of Unmined Longwall Panel on the Working Stability of a Longwall Using UDEC 2D—A Case Study," Energies, MDPI, vol. 15(5), pages 1-19, February.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:5:p:1803-:d:761172
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    References listed on IDEAS

    as
    1. Janina Świątek & Tomasz Janoszek & Tomasz Cichy & Kazimierz Stoiński, 2021. "Computational Fluid Dynamics Simulations for Investigation of the Damage Causes in Safety Elements of Powered Roof Supports—A Case Study," Energies, MDPI, vol. 14(4), pages 1-20, February.
    2. Xinshuai Shi & Hongwen Jing & Zhenlong Zhao & Yuan Gao & Yuanchao Zhang & Ruodi Bu, 2020. "Physical Experiment and Numerical Modeling on the Failure Mechanism of Gob-Side Entry Driven in Thick Coal Seam," Energies, MDPI, vol. 13(20), pages 1-24, October.
    3. Jun Yang & Hongyu Wang & Yajun Wang & Binhui Liu & Shilin Hou & Yu Cheng, 2019. "Stability Analysis of the Entry in a New Mining Approach Influenced by Roof Fracture Position," Sustainability, MDPI, vol. 11(22), pages 1-16, November.
    4. Takashi Sasaoka & Pisith Mao & Hideki Shimada & Akihiro Hamanaka & Jiro Oya, 2020. "Numerical Analysis of Longwall Gate-Entry Stability under Weak Geological Condition: A Case Study of an Indonesian Coal Mine," Energies, MDPI, vol. 13(18), pages 1-15, September.
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    Cited by:

    1. Yulong Chen & Junwen Zhang & Jianhang Chen & Xuejie Deng, 2022. "Special Issue: Rock Burst Disasters in Coal Mines," Energies, MDPI, vol. 15(13), pages 1-6, July.

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