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Research into Impact of Leaving Waste Rocks in the Mined-Out Space on the Geomechanical State of the Rock Mass Surrounding the Longwall Face

Author

Listed:
  • Adam Smoliński

    (Central Mining Institute, Plac Gwarków 1, 40-166 Katowice, Poland)

  • Dmyto Malashkevych

    (Department of Mining Engineering and Education, Dnipro University of Technology, 49005 Dnipro, Ukraine)

  • Mykhailo Petlovanyi

    (Department of Mining Engineering and Education, Dnipro University of Technology, 49005 Dnipro, Ukraine)

  • Kanay Rysbekov

    (Mining and Metallurgical Institute Named after O.A. Baikonurov, Satbayev University, Almaty 50013, Kazakhstan)

  • Vasyl Lozynskyi

    (Department of Mining Engineering and Education, Dnipro University of Technology, 49005 Dnipro, Ukraine)

  • Kateryna Sai

    (Department of Mining Engineering and Education, Dnipro University of Technology, 49005 Dnipro, Ukraine)

Abstract

Backfilling technology is not always used by mining enterprises, which is conditioned by technological and economic factors, such as the need for high mining rates and costs for the technological processes of transporting backfill materials from the daylight surface to the mined-out space. This concerns the underground mining of hard coal, which is a strategic energy resource, in the mines of Ukraine. This paper aims to study the effect of leaving the waste bottom rocks in the mined-out space of the longwall face without their drawing to the earth’s surface on the geomechanical state of the rocks surrounding the longwall face. The geomechanical assessment of the stress state of the rock mass surrounding the longwall face, when leaving the waste rocks from the seam bottom rocks in the mined-out space, is performed by the finite element method using the Ansys software package. A geomechanical model has been developed and substantiated, which adequately reflects the mining-geological conditions for seam mining within the extraction site, the actual structure and properties of the coal-bearing rock stratum, the parameters of the longwall face and the modified powered support for the processes of leaving the rocks in the mined-out space. The values and patterns have been determined of the decrease in the stress intensity concentrations in the coal-bearing roof mass in the frontal bearing pressure zone and destressing zone with an increase in the ratio of the rock pack thickness to the extracting seam thickness. The relative indicators of the load on the powered support section and the lowering of its roof have been determined by the ratio of the thickness of the rock pack formed in the mined-out space to the extracting seam thickness. The proposed mining method is of significant commercial and research interest for owners of coal mines developing thin coal seams because environmental costs for placing waste on the surface are reduced, and the energy potential of coal is increased due to the separation of waste rocks from coal in underground conditions. The need for a cycle of beneficiation of mined mass is eliminated and the geomechanical conditions of coal mining processes are improved.

Suggested Citation

  • Adam Smoliński & Dmyto Malashkevych & Mykhailo Petlovanyi & Kanay Rysbekov & Vasyl Lozynskyi & Kateryna Sai, 2022. "Research into Impact of Leaving Waste Rocks in the Mined-Out Space on the Geomechanical State of the Rock Mass Surrounding the Longwall Face," Energies, MDPI, vol. 15(24), pages 1-16, December.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:24:p:9522-:d:1004336
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    References listed on IDEAS

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    Cited by:

    1. Ming Li & Yueguan Yan & Huayang Dai & Zhaojiang Zhang, 2023. "Study on Rock and Surface Subsidence Laws of Super-High Water Material Backfilling and Mining Technology: A Case Study in Hengjian Coal Mine," Sustainability, MDPI, vol. 15(11), pages 1-22, May.
    2. Chuming Pang & Yongkui Shi & Yang Liu, 2023. "Research on Sustainable Development of Mining Goaf Management Based on Economic Models," Sustainability, MDPI, vol. 15(20), pages 1-21, October.
    3. Yujiang Zhang & Yining Wang & Bingyuan Cui & Guorui Feng & Shuai Zhang & Chunwang Zhang & Zhengjun Zhang, 2023. "A Disturbed Voussoir Beam Structure Mechanical Model and Its Application in Feasibility Determination of Upward Mining," Energies, MDPI, vol. 16(20), pages 1-18, October.
    4. Yuqing Wang & Yongkui Shi & Jian Hao, 2023. "Safety Evaluation and Simulation Research of Filling Mining Mine—A Case Study of Jisuo Coal Mine," Sustainability, MDPI, vol. 15(13), pages 1-23, June.
    5. Bao Shi & Pengfei Wang, 2023. "Research on Stability Control of Shields at Working Face with Large Dip Angle," Energies, MDPI, vol. 16(15), pages 1-19, August.

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