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Adjustment of the Yielding System of Mechanical Rock Bolts for Room and Pillar Mining Method in Stratified Rock Mass

Author

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  • Krzysztof Skrzypkowski

    (Faculty of Mining and Geoengineering, AGH University of Science and Technology, Mickiewicza 30 av., 30-059 Cracow, Poland)

  • Waldemar Korzeniowski

    (Faculty of Mining and Geoengineering, AGH University of Science and Technology, Mickiewicza 30 av., 30-059 Cracow, Poland)

  • Krzysztof Zagórski

    (Faculty of Mechanical Engineering and Robotics, AGH University of Science and Technology, Mickiewicza 30 av., 30-059 Cracow, Poland)

  • Anna Zagórska

    (Institute of Geological Sciences, Polish Academy of Sciences, Senacka 1, 31-002 Cracow, Poland)

Abstract

The article presents a novel yielding mechanism, especially designed for the rock bolt support. Mechanical rock bolts with an expansion head and equipped with one, two, four and six dome bearing plates were tested in the laboratory conditions. Furthermore, in the Phase2D numerical program, five room and pillar widths were modeled. The main aim of numerical modeling was to determine the maximal range of the rock damage area and the total displacements in the expanded room. The models were made for a room and pillar method with a roof sag for copper ore deposits in the Legnica-Głogów Copper District in Poland. Additionally, in the article a load model of the rock bolt support as a result of a geomechanical seismic event is presented. Based on the results of laboratory tests (load–displacement characteristics), the strain energy of the bolt support equipped with the yielding device in the form of dome bearing plates was determined and compared with the impact energy caused by predicted falling rock layers. Based on the laboratory tests, numerical modeling and mathematical dynamic model of rock bolt support, the dependence of the drop height and the corresponding impact energy for the expanded room was determined.

Suggested Citation

  • Krzysztof Skrzypkowski & Waldemar Korzeniowski & Krzysztof Zagórski & Anna Zagórska, 2020. "Adjustment of the Yielding System of Mechanical Rock Bolts for Room and Pillar Mining Method in Stratified Rock Mass," Energies, MDPI, vol. 13(8), pages 1-23, April.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:8:p:2082-:d:348542
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    References listed on IDEAS

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    1. Krzysztof Skrzypkowski & Waldemar Korzeniowski & Krzysztof Zagórski & Anna Zagórska, 2019. "Flexibility and Load-Bearing Capacity of Roof Bolting as Functions of Mounting Depth and Hole Diameter," Energies, MDPI, vol. 12(19), pages 1-23, September.
    2. Krzysztof Skrzypkowski & Waldemar Korzeniowski & Krzysztof Zagórski & Anna Zagórska, 2020. "Modified Rock Bolt Support for Mining Method with Controlled Roof Bending," Energies, MDPI, vol. 13(8), pages 1-20, April.
    3. Manchao He & Yubing Gao & Jun Yang & Weili Gong, 2017. "An Innovative Approach for Gob-Side Entry Retaining in Thick Coal Seam Longwall Mining," Energies, MDPI, vol. 10(11), pages 1-22, November.
    4. Krzysztof Skrzypkowski, 2019. "The Influence of Room and Pillar Method Geometry on the Deposit Utilization Rate and Rock Bolt Load," Energies, MDPI, vol. 12(24), pages 1-15, December.
    Full references (including those not matched with items on IDEAS)

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    Cited by:

    1. Krzysztof Skrzypkowski & Krzysztof Zagórski & Anna Zagórska & Fhatuwani Sengani, 2022. "Access to Deposits as a Stage of Mining Works," Energies, MDPI, vol. 15(22), pages 1-16, November.
    2. Paulina Gackowiec & Marta Podobińska-Staniec & Edyta Brzychczy & Christopher Kühlbach & Toyga Özver, 2020. "Review of Key Performance Indicators for Process Monitoring in the Mining Industry," Energies, MDPI, vol. 13(19), pages 1-20, October.
    3. Krzysztof Skrzypkowski, 2021. "An Experimental Investigation into the Stress-Strain Characteristic under Static and Quasi-Static Loading for Partially Embedded Rock Bolts," Energies, MDPI, vol. 14(5), pages 1-17, March.
    4. Krzysztof Lalik & Ireneusz Dominik & Paweł Gut & Krzysztof Skrzypkowski & Waldemar Korzeniowski & Krzysztof Zagórski, 2021. "Non-Destructive Acoustical Rock Bolt Testing System with Intelligent Filtering in Salt Mine ‘Wieliczka’," Energies, MDPI, vol. 14(17), pages 1-16, September.
    5. Artur Kozłowski & Łukasz Bołoz, 2021. "Design and Research on Power Systems and Algorithms for Controlling Electric Underground Mining Machines Powered by Batteries," Energies, MDPI, vol. 14(13), pages 1-21, July.
    6. Krzysztof Skrzypkowski, 2020. "Case Studies of Rock Bolt Support Loads and Rock Mass Monitoring for the Room and Pillar Method in the Legnica-Głogów Copper District in Poland," Energies, MDPI, vol. 13(11), pages 1-20, June.
    7. Krzysztof Skrzypkowski, 2020. "Decreasing Mining Losses for the Room and Pillar Method by Replacing the Inter-Room Pillars by the Construction of Wooden Cribs Filled with Waste Rocks," Energies, MDPI, vol. 13(14), pages 1-20, July.

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