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Floor Heave Mechanism of Gob-Side Entry Retaining with Fully-Mechanized Backfilling Mining

Author

Listed:
  • Peng Gong

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining & Technology, Xuzhou 221116, China)

  • Zhanguo Ma

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining & Technology, Xuzhou 221116, China)

  • Xiaoyan Ni

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining & Technology, Xuzhou 221116, China)

  • Ray Ruichong Zhang

    (Department of Mechanical Engineering, Colorado School of Mines, Golden, CO 80401, USA)

Abstract

Serious floor heave in gob-side entry retaining (GER) with fully-mechanized gangue backfilling mining affects the transportation and ventilation safety of the mine. A theoretical mechanical model for the floor of gob-backfilled GER was established. The effects of the mechanical properties of floor strata, the granular compaction of backfilling area (BFA), the vertical support of roadside support body (RSB), and the stress concentration of the solid coal on the floor heave of the gob-backfilled GER were studied. The results show that the floor heave increases with the increase of the coal seam buried depth, and decreases with the increase of the floor rock elastic modulus. The development depth of the plastic zone decreases with the increase of the c and φ value of the floor rock, and increases with the increase of the stress concentration factor of the solid coal. The development depth of the plastic zone in the test mine reached 2.68 m. The field test and monitoring results indicate that the comprehensive control scheme of adjusting backfilling pressure, deep grouting reinforcement, shallow opening stress relief slots, and surface pouring can effectively control the floor heave. The roof-floor displacement is reduced by 73.8% compared to that with the original support scheme. The roadway section meets the design and application requirements when the deformation stabilizes, demonstrating the rationality of the mechanical model. The research results overcome the technical bottleneck of floor heave control of fully-mechanized backfilling GER, providing a reliable basis for the design of a floor heave control scheme.

Suggested Citation

  • Peng Gong & Zhanguo Ma & Xiaoyan Ni & Ray Ruichong Zhang, 2017. "Floor Heave Mechanism of Gob-Side Entry Retaining with Fully-Mechanized Backfilling Mining," Energies, MDPI, vol. 10(12), pages 1-19, December.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:12:p:2085-:d:122249
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    References listed on IDEAS

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    1. Yiyu Lu & Shaojie Zuo & Zhaolong Ge & Songqiang Xiao & Yugang Cheng, 2016. "Experimental Study of Crack Initiation and Extension Induced by Hydraulic Fracturing in a Tree-Type Borehole Array," Energies, MDPI, vol. 9(7), pages 1-15, June.
    2. Yiyu Lu & Yugang Cheng & Zhaolong Ge & Liang Cheng & Shaojie Zuo & Jianyu Zhong, 2016. "Determination of Fracture Initiation Locations during Cross-Measure Drilling for Hydraulic Fracturing of Coal Seams," Energies, MDPI, vol. 9(5), pages 1-13, May.
    3. Xiaowei Feng & Nong Zhang & Lianyuan Gong & Fei Xue & Xigui Zheng, 2015. "Application of a Backfilling Method in Coal Mining to Realise an Ecologically Sensitive “Black Gold” Industry," Energies, MDPI, vol. 8(5), pages 1-12, April.
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    Cited by:

    1. Zhiyi Zhang & Hideki Shimada, 2018. "Numerical Study on the Effectiveness of Grouting Reinforcement on the Large Heaving Floor of the Deep Retained Goaf-Side Gateroad: A Case Study in China," Energies, MDPI, vol. 11(4), pages 1-15, April.
    2. Wenqiang Mu & Lianchong Li & Zhongping Guo & Zhaowen Du & Sixu Wang, 2019. "Novel Segmented Roadside Plugging-Filling Mining Method and Overlying Rock Mechanical Mechanism Analyses," Energies, MDPI, vol. 12(11), pages 1-20, May.
    3. Huaidong Liu & Changyou Liu & Ya’nan Dong, 2022. "Theoretical Study on the Mechanism of Asymmetrical Large Deformation of Heading Roadway Facing Mining," Sustainability, MDPI, vol. 14(22), pages 1-22, November.
    4. Zhibiao Guo & Haohao Wang & Zimin Ma & Pengfei Wang & Xiaohui Kuai & Xianzhe Zhang, 2021. "Research on the Transmission of Stresses by Roof Cutting near Gob Rocks," Energies, MDPI, vol. 14(5), pages 1-24, February.
    5. Piotr Małkowski & Łukasz Ostrowski & Jerzy Stasica, 2022. "Modeling of Floor Heave in Underground Roadways in Dry and Waterlogged Conditions," Energies, MDPI, vol. 15(12), pages 1-27, June.
    6. Xingyu Zhang & Liang Chen & Yubing Gao & Jinzhu Hu & Jun Yang & Manchao He, 2019. "Study of An Innovative Approach of Roof Presplitting for Gob-Side Entry Retaining in Longwall Coal Mining," Energies, MDPI, vol. 12(17), pages 1-16, August.
    7. Housheng Jia & Luyao Wang & Kai Fan & Bo Peng & Kun Pan, 2019. "Control Technology of Soft Rock Floor in Mining Roadway with Coal Pillar Protection: A case study," Energies, MDPI, vol. 12(15), pages 1-21, August.
    8. Piotr Małkowski & Łukasz Ostrowski & Łukasz Bednarek, 2020. "The Effect of Selected Factors on Floor Upheaval in Roadways—In Situ Testing," Energies, MDPI, vol. 13(21), pages 1-23, October.
    9. Qiang Zhang & Jixiong Zhang & Zhongya Wu & Yang Chen, 2019. "Overview of Solid Backfilling Technology Based on Coal-Waste Underground Separation in China," Sustainability, MDPI, vol. 11(7), pages 1-20, April.
    10. Xingping Lai & Huicong Xu & Pengfei Shan & Yanlei Kang & Zeyang Wang & Xuan Wu, 2020. "Research on Mechanism and Control of Floor Heave of Mining-Influenced Roadway in Top Coal Caving Working Face," Energies, MDPI, vol. 13(2), pages 1-14, January.

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