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Deformation Mechanism and Stability Control of Roadway Surrounding Rock with Compound Roof: Research and Applications

Author

Listed:
  • Yang Yu

    (College of Civil Engineering, Xuzhou University of Technology, Xuzhou 221111, China)

  • Xiangyu Wang

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

  • Jianbiao Bai

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

  • Lianying Zhang

    (College of Civil Engineering, Xuzhou University of Technology, Xuzhou 221111, China)

  • Hongchun Xia

    (College of Civil Engineering, Xuzhou University of Technology, Xuzhou 221111, China)

Abstract

In view of problems with roadways with a compound roof, such as the occurrence of instability in the roof strata, ease of separation of the layer caving, difficulty of maintenance, and poor safety, we established a mechanical calculation model of a roadway with compound roof using the elastic mechanics theory, taking the stability control of a roadway with compound roof at a coal mine in Guizhou Province, China as the research background, and based on the actual characteristics of the coal seam and the roof and floor slate. Expressions of the separation layer and instability limit load of compound roof were derived, and the calculation and verification were carried out in combination with the actual conditions. By means of numerical simulation, the distribution and evolution laws of stress, displacement and plastic zone of roadways with a compound roof were studied, and the deformation characteristics and instability mechanism of roadways with a compound roof were revealed: (1) in early stage deformation of roadway, the amount is large, the speed is fast, and the scale is wide; (2) compound roofs are vulnerable to abscission and instability, the bearing capacity of the two sides is low due to softness and cracking, the shear failure of side angles and vertex angles weakens the strength of surrounding rock, and the self-bearing capacity of surrounding rock is low; (3) the bolt and anchor bear relatively large tensile force, and the support structure is easy to be broken up. On this basis, the stability control principle of a roadway with compound roof tunnel was put forward: fast and timely support; high-strength bolt strong support; improving the stability of the roof and the bearing capacity of the two sides; restraining the shear failure of the key bearing parts such as the side angles and the bottom angles, and targeted stability control technology for roadways with a compound roof was developed. The field industrial test showed that the deformation of this roadway with a compound roof was effectively controlled and the overall stability of the roadway was effectively improved. The results of this study could provide useful reference for a roadway with a compound roof under similar conditions.

Suggested Citation

  • Yang Yu & Xiangyu Wang & Jianbiao Bai & Lianying Zhang & Hongchun Xia, 2020. "Deformation Mechanism and Stability Control of Roadway Surrounding Rock with Compound Roof: Research and Applications," Energies, MDPI, vol. 13(6), pages 1-19, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:6:p:1350-:d:332498
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    References listed on IDEAS

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    1. Yunpeng Cao & Xinran Lv & Guodong Han & Junqi Luan & Shuying Li, 2019. "Research on Gas-Path Fault-Diagnosis Method of Marine Gas Turbine Based on Exergy Loss and Probabilistic Neural Network," Energies, MDPI, vol. 12(24), pages 1-17, December.
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    4. Xingen Ma & Manchao He & Jiong Wang & Yubing Gao & Daoyong Zhu & Yuxing Liu, 2018. "Mine Strata Pressure Characteristics and Mechanisms in Gob-Side Entry Retention by Roof Cutting under Medium-Thick Coal Seam and Compound Roof Conditions," Energies, MDPI, vol. 11(10), pages 1-25, September.
    5. Deyuan Fan & Xuesheng Liu & Yunliang Tan & Shilin Song & Qingheng Gu & Lei Yan & Qiang Xu, 2019. "Roof Cutting Parameters Design for Gob-Side Entry in Deep Coal Mine: A Case Study," Energies, MDPI, vol. 12(10), pages 1-25, May.
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    Cited by:

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    2. Yang Yu & Jianbiao Bai & Xiangyu Wang & Lianying Zhang, 2020. "Control of the Surrounding Rock of a Goaf-Side Entry Driving Heading Mining Face," Sustainability, MDPI, vol. 12(7), pages 1-16, March.
    3. Dingchao Chen & Xiangyu Wang & Feiteng Zhang & Menglong Li & Xiangqian Zhao & Guanjun Li & Yang Yu & Guanghui Wang & Jiaxin Zhao & Xiangdong Wang, 2022. "Research on Directional Controllability of Cracking in Hydraulic Fracturing of Hard Overburden Based on Local Stress Field Intervention," Energies, MDPI, vol. 15(12), pages 1-21, June.

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