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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

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  • Krzysztof Skrzypkowski

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

Abstract

The article presents methods of securing mining excavations using wooden cribs. For the underground room and pillar method used to excavate zinc and lead ore body in the Olkusz-Pomorzany mine in Poland, model tests for the replacement of rock pillars by wooden cribs are presented. In the first stage of research, the results of laboratory strength tests carried out on models of four-point, six-point and eight-point cribs made of wooden beech beams at a 1:28 scale arranged horizontally were determined. For the first time, a concave round notch connection was used to connect the beams of the wooden cribs. The maximal capacity of cribs consisting only of beams and filled with waste rocks taken from underground mining excavations was determined. In addition, the vertical deformations of the cribs at maximal loading force and their specific deformations are presented. Additionally, on the basis of load-displacement characteristics, the range in variability of the stiffness of empty cribs and those filled with waste rocks was calculated as a function of their compressibility. In the second stage of research, the room and pillar method was designed in the Phase2 numerical program. The aim of the study was to determine the stresses in the inter-room pillars. Based on the results of laboratory and numerical tests, a factor of safety was determined, indicating that it is possible to reduce mining losses while maintaining the safe exploitation conditions of the ore body.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:14:p:3564-:d:382929
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    References listed on IDEAS

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    1. Hengjie Luan & Yujing Jiang & Huili Lin & Guofeng Li, 2018. "Development of a New Gob-Side Entry-Retaining Approach and Its Application," Sustainability, MDPI, vol. 10(2), pages 1-15, February.
    2. 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.
    3. 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.
    4. Kashi Vishwanath Jessu & Anthony J. S. Spearing & Mostafa Sharifzadeh, 2018. "A Parametric Study of Blast Damage on Hard Rock Pillar Strength," Energies, MDPI, vol. 11(7), pages 1-18, July.
    5. Yang Yu & Shen-en Chen & Ka-zhong Deng & Hong-dong Fan, 2017. "Long-Term Stability Evaluation and Pillar Design Criterion for Room-and-Pillar Mines," Energies, MDPI, vol. 10(10), pages 1-13, October.
    6. 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.
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    Cited by:

    1. Karolina Adach-Pawelus & Daniel Pawelus, 2021. "Application of Hydraulic Backfill for Rockburst Prevention in the Mining Field with Remnant in the Polish Underground Copper Mines," Energies, MDPI, vol. 14(13), pages 1-17, June.
    2. Krzysztof Skrzypkowski, 2020. "Comparative Analysis of the Mining Cribs Models Filled with Gangue," Energies, MDPI, vol. 13(20), pages 1-18, October.
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    5. 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.

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