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Characteristics and Formation Mechanism of Surface Residual Deformation above Longwall Abandoned Goaf

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  • Erhu Bai

    (Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi’an University of Science and Technology, Xi’an 710054, China
    School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
    State Key Laboratory of Coal Resources in Western China, Xi’an University of Science and Technology, Xi’an 710054, China
    State Collaborative Innovative Centre of Coal Work Safety and Clean-Efficiency Utilization, Jiaozuo 454003, China)

  • Xueyi Li

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

  • Wenbing Guo

    (Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi’an University of Science and Technology, Xi’an 710054, China
    School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
    State Key Laboratory of Coal Resources in Western China, Xi’an University of Science and Technology, Xi’an 710054, China
    State Collaborative Innovative Centre of Coal Work Safety and Clean-Efficiency Utilization, Jiaozuo 454003, China)

  • Yi Tan

    (Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi’an University of Science and Technology, Xi’an 710054, China
    School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
    State Key Laboratory of Coal Resources in Western China, Xi’an University of Science and Technology, Xi’an 710054, China
    State Collaborative Innovative Centre of Coal Work Safety and Clean-Efficiency Utilization, Jiaozuo 454003, China)

  • Mingjie Guo

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

  • Peng Wen

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

  • Zhibao Ma

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

Abstract

With the rapid development of social economy in China, the contradiction between the wide distribution of abandoned goaf and the shortage of land for engineering construction is becoming increasingly prominent. The effective utilization of coal mining subsidence areas has become an effective measure to alleviate the poverty of construction land in mining areas and promote the green transformation of mining cities. The key to the scientific utilization of abandoned goaf is the prevention and control of surface residual deformation, which depends on the formation mechanism of surface residual deformation. Based on the regularity of mining-induced surface movement and deformation under different mining sizes, it is concluded that the full mining degree of working face is the primary condition for entering the surface recession period. The trapezoidal and periodic forward movement characteristics of mining-induced overburden destruction are analyzed. The regularity of upward transmission of mining-induced fissures with overburden destruction is clarified. The influencing factors of surface residual deformation are equivalent to the influencing factors of overburden structure and caved zone. The deformation characteristics of broken rock in the caved zone under different conditions (particle size, gradation, and water content) are analyzed. It is concluded that the surface residual subsidence near the boundary of the goaf is more significant than that in the middle of the goaf. It is revealed that the overburden structure at the boundary of the goaf and the re-compaction of the caved zone is the mechanism of surface residual deformation. The characteristics of surface residual deformation in abandoned goaf have been verified by field measurement, and it is pointed out that the surface residual deformation in abandoned goaf has long-term characteristics, which provides a theoretical basis for accurate prediction of surface residual deformation and rational utilization of abandoned goaf.

Suggested Citation

  • Erhu Bai & Xueyi Li & Wenbing Guo & Yi Tan & Mingjie Guo & Peng Wen & Zhibao Ma, 2022. "Characteristics and Formation Mechanism of Surface Residual Deformation above Longwall Abandoned Goaf," Sustainability, MDPI, vol. 14(23), pages 1-16, November.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:23:p:15985-:d:989020
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    References listed on IDEAS

    as
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