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Study on the Partial Paste Backfill Mining Method in a Fully Mechanized Top-Coal Caving Face: Case Study from a Coal Mine, China

Author

Listed:
  • Zhaowen Du

    (College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China)

  • Deyou Chen

    (College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China)

  • Xuelong Li

    (College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China)

  • Yong Jian

    (College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China)

  • Weizhao Zhang

    (Shandong Energy Group Northwest Mining Company, Xi’an 710018, China)

  • Dingding Zhang

    (Shandong Energy Group Northwest Mining Company, Xi’an 710018, China)

  • Yongfeng Tian

    (Shandong Energy Group Dispatching Command Center, Jinan 250101, China)

Abstract

Paste backfill mining is an significant part of green coal mining, which can improve resource utilization and extend the service life of mines. It is important for solving the “three under, one above” mining problem and avoiding industrial wastes such as coal gangue and fly ash that occupy farmland and pollute the environment. To address the difficult filling problem of a fully mechanized top-coal caving face (FMT-CCF), a new method of partial paste backfill mining is herein proposed. First, the partial paste backfill mining method and implementation steps of the FMT-CCF are introduced in detail. Then, the mechanistic model of the roof beam in partial paste backfill mining is established. Then, the filling structural factors on the filling effect of the 42105 FMT-CCF are determined. Dependent on the assay of the migration law of overlying stratum after filling, numerical simulation analysis is used to research the feature effect of the main filling structural factors on the filling effect. Finally, the paste filling rate, filling width, and filling strength suitable for the 42105 FMT-CCF are obtained. When the filling rate reaches 100%, a significant alteration takes place, resulting in the efficient decrease of the overlying rock stress arch shell’s height. As the width of the filling body expands from 10 m at each end to 20 m, the stress arch of the overlying rock experiences maximum reduction, specifically decreasing by approximately 14 m. When the strength of the filling body is greater than 0.4 GPa, the filling effect is better. This study has important guidance and reference significance for the partial paste backfill of FMT-CCF in thick seam mining.

Suggested Citation

  • Zhaowen Du & Deyou Chen & Xuelong Li & Yong Jian & Weizhao Zhang & Dingding Zhang & Yongfeng Tian, 2024. "Study on the Partial Paste Backfill Mining Method in a Fully Mechanized Top-Coal Caving Face: Case Study from a Coal Mine, China," Sustainability, MDPI, vol. 16(11), pages 1-24, May.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:11:p:4393-:d:1399686
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    References listed on IDEAS

    as
    1. Guojian Zhang & Zhiyang Wang & Guangli Guo & Wei Wei & Fugang Wang & Leilei Zhong & Yaqiang Gong, 2022. "Study on Regional Strata Movement during Deep Mining of Erdos Coal Field and Its Control," IJERPH, MDPI, vol. 19(22), pages 1-32, November.
    2. Wenhao Cao & Xufeng Wang & Peng Li & Dongsheng Zhang & Chundong Sun & Dongdong Qin, 2018. "Wide Strip Backfill Mining for Surface Subsidence Control and Its Application in Critical Mining Conditions of a Coal Mine," Sustainability, MDPI, vol. 10(3), pages 1-16, March.
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