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The Influence of Room and Pillar Method Geometry on the Deposit Utilization Rate and Rock Bolt Load

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  • Krzysztof Skrzypkowski

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

Abstract

In this article, a model of ore deposit in form of a lense carried out in the MineScape program, is presented. The lense had a thickness of 30 m, length along the strike 200 m, and the depth buried was for 80 m to 110 m below the surface. In the first layer, counting from the lowest level, a room and pillar method with variable geometry was designed. The width and length dimensions for rooms and pillars were: 4 m, 5 m and 6 m, respectively. For the selected part of the deposit, three variants of the system with variable geometry of rooms and pillars were designed, for which the deposit utilization coefficient was determined. The next stage of the research was to determine the influence of the geometry of the pillars and rooms on the range of the rock destruction zone around room excavations. For this purpose, numerical calculations using the three-dimensional Examine 3D program, based on the boundary element method, were made. The results of numerical tests were used to calculate the load of the rock bolt support, which is currently used in the zinc and lead underground mine “Olkusz-Pomorzany” in Poland. Currently in the mine, the bolt spacing is 1 m × 1 m, and the technology for fixing the bolt rod is based on resin cartridges that completely fill the bolt hole. In order to spread the spacing of the rock bolt support and to apply segmental fixing of the bolt rod, in the laboratory tests, rock bolt supports with increased strength were tested. Based on the results obtained, it was found that the rock bolt can be installed segmentally, using a cement grout, and its spacing can be increased to 2 m.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:24:p:4770-:d:297870
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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.
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    Cited by:

    1. Devendra Joshi & Hamed Gholami & Hitesh Mohapatra & Anis Ali & Dalia Streimikiene & Susanta Kumar Satpathy & Arvind Yadav, 2022. "The Application of Stochastic Mine Production Scheduling in the Presence of Geological Uncertainty," Sustainability, MDPI, vol. 14(16), pages 1-19, August.
    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, 2020. "Comparative Analysis of the Mining Cribs Models Filled with Gangue," Energies, MDPI, vol. 13(20), pages 1-18, October.
    4. 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.
    5. 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.
    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, 2021. "Determination of the Backfilling Time for the Zinc and Lead Ore Deposits with Application of the BackfillCAD Model," Energies, MDPI, vol. 14(11), pages 1-19, May.
    8. Yongkang Yang & Xuecong Xu & Chenlong Wang, 2023. "Study on the Mechanism of Surrounding Rock Deformation and Its Control for Roof Cutting Retained Gob-Side Entry in Close-Distance Coal Seams Co-Mining," Energies, MDPI, vol. 16(11), pages 1-17, May.
    9. Yuanyuan Pu & Derek B. Apel & Stanislaw Prusek & Andrzej Walentek & Tomasz Cichy, 2021. "Back-analysis for initial ground stress field at a diamond mine using machine learning approaches," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 105(1), pages 191-203, January.
    10. Houqiang Yang & Changliang Han & Nong Zhang & Yuantian Sun & Dongjiang Pan & Changlun Sun, 2020. "Long High-Performance Sustainable Bolt Technology for the Deep Coal Roadway Roof: A Case Study," Sustainability, MDPI, vol. 12(4), pages 1-14, February.
    11. 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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