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Mechanical Characteristics of Superhigh-Water Content Material Concretion and Its Application in Longwall Backfilling

Author

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  • Xufeng Wang

    (School of Mines, China University of Mining & Technology, Xuzhou 221116, China
    The Jiangsu Laboratory of Mining-Induced Seismicity Monitoring, China University of Mining & Technology, Xuzhou 221116, China
    Key Laboratory of Deep Coal Resource Mining, China University of Mining & Technology, Xuzhou 221116, China)

  • Dongdong Qin

    (School of Mines, China University of Mining & Technology, Xuzhou 221116, China)

  • Dongsheng Zhang

    (School of Mines, China University of Mining & Technology, Xuzhou 221116, China
    State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Xuzhou 221116, China)

  • Chundong Sun

    (Jizhong Energy Handan Mining Industry Group, Handan 056002, China)

  • Chengguo Zhang

    (School of Mining Engineering, University of New South Wales, Sydney, NSW 2052, Australia)

  • Mengtang Xu

    (School of Mines, Guizhou Institute of Technology, Guiyang 550003, China)

  • Bo Li

    (School of Mines, China University of Mining & Technology, Xuzhou 221116, China)

Abstract

Superhigh-water content material (SCM) has been widely utilized for goaf backfilling, grouting, and fire prevention and extinguishing. In this paper, the engineering mechanical characteristics of superhigh-water content material concretion (SCMC) were studied for two types of backfilling technologies in longwall mining—open-type and pocket-type backfilling. The mechanical properties and responses of the SCMC were assessed under different cementation states, varying loading conditions and at different scales. The results indicate that: (1) the compressive and tensile strengths of SCMC specimens in different cementation states increase as the curing time increases—the SCMC formed by a mixture of SCM and gangues has higher strength than that of pure SCM; (2) the SCMC is under different loading and confinement conditions when different backfilling technologies is applied; however the strength of SCMC increases with curing time and decreases with water volume percentage; and (3) large-size specimens of pure SCMC enter into an accelerated creep state at a leveled load of 1.4 MPa. The effects of SCM backfilling on subsidence control has been verified by field applications. The results presented in this paper can provide data support for the optimization of backfill mining technology using SCM, as well as for the design of hydraulic supports parameters at longwall faces.

Suggested Citation

  • Xufeng Wang & Dongdong Qin & Dongsheng Zhang & Chundong Sun & Chengguo Zhang & Mengtang Xu & Bo Li, 2017. "Mechanical Characteristics of Superhigh-Water Content Material Concretion and Its Application in Longwall Backfilling," Energies, MDPI, vol. 10(10), pages 1-15, October.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:10:p:1592-:d:114912
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    Cited by:

    1. Dacian Paul Marian & Ilie Onica & Ramona-Rafila Marian & Dacian-Andrei Floarea, 2020. "Finite Element Analysis of the State of Stresses on the Structures of Buildings Influenced by Underground Mining of Hard Coal Seams in the Jiu Valley Basin (Romania)," Sustainability, MDPI, vol. 12(4), pages 1-25, February.
    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.
    3. Yujun Xu & Liqiang Ma & Ichhuy NGO & Jiangtao Zhai, 2022. "Continuous Extraction and Continuous Backfill Mining Method Using Carbon Dioxide Mineralized Filling Body to Preserve Shallow Water in Northwest China," Energies, MDPI, vol. 15(10), pages 1-24, May.

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