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Vertical Stress and Deformation Characteristics of Roadside Backfilling Body in Gob-Side Entry for Thick Coal Seams with Different Pre-Split Angles

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  • Yuqi Ren

    (College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    Shanxi Province Research Center of Green Mining Engineering Technology, Shanxi 030024, China)

  • Guorui Feng

    (College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    Shanxi Province Research Center of Green Mining Engineering Technology, Shanxi 030024, China)

  • Pengfei Wang

    (College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    Shanxi Province Research Center of Green Mining Engineering Technology, Shanxi 030024, China)

  • Jun Guo

    (College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    Shanxi Province Research Center of Green Mining Engineering Technology, Shanxi 030024, China)

  • Yi Luo

    (College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    Shanxi Province Research Center of Green Mining Engineering Technology, Shanxi 030024, China
    Department of Mining Engineering, West Virginia University, Morgantown, WV 26506, USA)

  • Ruipeng Qian

    (College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    Shanxi Province Research Center of Green Mining Engineering Technology, Shanxi 030024, China)

  • Qiang Sun

    (College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    Shanxi Province Research Center of Green Mining Engineering Technology, Shanxi 030024, China)

  • Songyu Li

    (College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    Shanxi Province Research Center of Green Mining Engineering Technology, Shanxi 030024, China)

  • Yonggan Yan

    (College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    Shanxi Province Research Center of Green Mining Engineering Technology, Shanxi 030024, China)

Abstract

Retained gob-side entry (RGE) is a significant improvement for fully-mechanized longwall mining. The environment of surrounding rock directly affects its stability. Roadside backfilling body (RBB), a man-made structure in RGE plays the most important role in successful application of the technology. In the field, however, the vertical deformation of RBB is large during the panel extraction, which leads to malfunction of the RGE. In order to solve the problem, roof pre-split is employed. According to geological conditions as well as the physical modeling of roof behavior and deformation of surrounding rock, the support resistance of RBB is calculated. The environment of surrounding rock, vertical stress and vertical deformation of the RBB in the RGE with different roof pre-split angles are analyzed using FLAC 3D software. With the increase of roof pre-split angle, the vertical stresses both in the coal wall and RBB are minimum, and the vertical deformation of RBB also decreases from 110.51 mm to 6.1 mm. Therefore, based on the results of numerical modeling and field observation, roof pre-split angle of 90° is more beneficial to the maintenance of the RGE.

Suggested Citation

  • Yuqi Ren & Guorui Feng & Pengfei Wang & Jun Guo & Yi Luo & Ruipeng Qian & Qiang Sun & Songyu Li & Yonggan Yan, 2019. "Vertical Stress and Deformation Characteristics of Roadside Backfilling Body in Gob-Side Entry for Thick Coal Seams with Different Pre-Split Angles," Energies, MDPI, vol. 12(7), pages 1-16, April.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:7:p:1316-:d:220404
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    References listed on IDEAS

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    1. Guorui Feng & Pengfei Wang & Yoginder P. Chugh, 2018. "A New Gob-Side Entry Layout for Longwall Top Coal Caving," Energies, MDPI, vol. 11(5), pages 1-24, May.
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    Cited by:

    1. Zhengzheng Xie & Nong Zhang & Fanfei Meng & Changliang Han & Yanpei An & Ruojun Zhu, 2019. "Deformation Field Evolution and Failure Mechanisms of Coal–Rock Combination Based on the Digital Speckle Correlation Method," Energies, MDPI, vol. 12(13), pages 1-14, June.
    2. Xiaohong Niu & Guorui Feng & Qin Liu & Yanna Han & Ruipeng Qian, 2022. "Numerical investigation on mechanism and fluid flow behavior of goaf water inrush: a case study of Dongyu coal mine," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 113(3), pages 1783-1802, September.

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