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The Influence of the Backfilling Roadway Driving Sequence on the Rockburst Risk of a Coal Pillar Based on an Energy Density Criterion

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  • Yi Xue

    (State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an 710048, China
    Institute of Geotechnical Engineering, Shaanxi Provincial Key Laboratory of Loess Mechanics and Engineering, Xi’an University of Technology, Xi’an 710048, China)

  • Zhengzheng Cao

    (School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

  • Feng Du

    (School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

  • Lin Zhu

    (State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an 710048, China
    Institute of Geotechnical Engineering, Shaanxi Provincial Key Laboratory of Loess Mechanics and Engineering, Xi’an University of Technology, Xi’an 710048, China)

Abstract

The rockburst hazard has always been an important issue affecting the safety production of coal mines in China. The unreasonable sequencing of roadway driving can lead to the dynamic instability of coal pillars, which subsequently causes rockburst accidents in roadway backfilling mining engineering and poses a serious threat to the safety of the mines. Roadway backfilling mining technology is an effective approach with which to mine corner residual coal resources under buildings, railways, and rivers. An energy density criterion is established and programmed with FISH language using numerical analysis software for the rockburst risk evaluation of coal pillars. On this basis, a numerical simulation model is established based on four scheme types, namely, the sequential mining, one-roadway interval mining, two-roadway interval mining, and three-roadway interval mining schemes. The influence of the backfilling roadway driving sequence on coal pillar stability is investigated, and the change law of vertical stress and energy density factor of coal pillars in different driving sequences in roadway backfilling mining technology are analyzed. According to the research results, the maximum energy density factor value of 21,172 J/m 4 for coal pillars in one-roadway interval mining is the lowest among the different schemes. Therefore, the one-roadway interval mining scheme is the optimal choice in roadway backfilling mining technology. The results can be treated as an important basis for the prevention and treatment of coal pillar instability and rockburst in roadway backfilling mining technology.

Suggested Citation

  • Yi Xue & Zhengzheng Cao & Feng Du & Lin Zhu, 2018. "The Influence of the Backfilling Roadway Driving Sequence on the Rockburst Risk of a Coal Pillar Based on an Energy Density Criterion," Sustainability, MDPI, vol. 10(8), pages 1-21, July.
    • Handle: RePEc:gam:jsusta:v:10:y:2018:i:8:p:2609-:d:159924
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    References listed on IDEAS

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    1. Gangye Guo & Hongpu Kang & Deyu Qian & Fuqiang Gao & Yang Wang, 2018. "Mechanism for Controlling Floor Heave of Mining Roadways Using Reinforcing Roof and Sidewalls in Underground Coal Mine," Sustainability, MDPI, vol. 10(5), pages 1-15, May.
    2. Meng Li & Jixiong Zhang & Kai Quan & Nan Zhou, 2017. "Innovative Extraction Method for a Coal Seam with a Thick Rock-Parting for Supporting Coal Mine Sustainability," Sustainability, MDPI, vol. 9(11), pages 1-13, October.
    3. Yi Xue & Faning Dang & Zhengzheng Cao & Feng Du & Fei Liu & Jie Ren & Feng Gao, 2018. "Numerical Analysis of Heat and Gas Transfer Characteristics during Heat Injection Processes Based on a Thermo-Hydro-Mechanical Model," Energies, MDPI, vol. 11(7), pages 1-20, July.
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    Cited by:

    1. Heng Zhang & Liang Chen & Shougen Chen & Jianchun Sun & Jiasong Yang, 2018. "The Spatiotemporal Distribution Law of Microseismic Events and Rockburst Characteristics of the Deeply Buried Tunnel Group," Energies, MDPI, vol. 11(12), pages 1-21, November.

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