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Mechanism and Control of Asymmetric Floor Heave in the Gob-Side Coal Roadway under Mining Pressure in Extra-Thick Coal Seams

Author

Listed:
  • Deqiu Wang

    (School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China)

  • Yun Zheng

    (School of Safety Engineering, North China Institute of Science and Technology, Langfang 065201, China)

  • Fulian He

    (School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China)

  • Jiayu Song

    (School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China)

  • Jianlong Zhang

    (School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China)

  • Yanhao Wu

    (School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China)

  • Pengpeng Jia

    (School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China)

  • Xiaohui Wang

    (School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China)

  • Baoping Liu

    (School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China)

  • Feifei Wang

    (School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China)

  • Yajiang Zhang

    (School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China)

  • Kai Tao

    (School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China)

Abstract

Due to their tense mining succession relationship, gob-side roadways may undergo significant deformation under multi-mining pressure. In this article, many methods, such as on-site research, a theoretical analysis, a numerical simulation and an industrial experiment, are used to research the mechanism of asymmetric floor heave in a gob-side coal roadway affected by mining pressure during the mining of extra-thick coal seams. Our main research is as follows: (1) By monitoring the floor deformation in the roadway on site, it is concluded that the roadway floor shows asymmetry, indicating that the floor displacement near the coal pillar side is relatively large. (2) Based on a lateral overburden structure model of the roadway, the calculation formulas of the horizontal vertical stress caused by the roadway excavation and the excavation of the upper working face are derived separately, and the vertical stress coupling curves on both sides of the roadway during the mining of the upper working face are obtained through a numerical simulation. It is concluded that the cause of the asymmetric floor heave in the roadway is an uneven distribution of vertical stress. (3) The numerical simulation shows a symmetrical distribution of the floor displacement curve during the roadway excavation with a max. displacement of 49.5 mm. The floor displacement curve during the mining of the upper working face is asymmetric with a max. displacement of 873 mm at a distance of 1 m from the central axis near the coal pillar side. The range of the plastic zone in the roadway gradually expands with the mining of the upper working face, and the maximum depth of floor failure is 5.5 m. (4) According to the cooperative control principle of “roof + two sides + floor”, an asymmetric floor heave joint control scheme of “floor leveling + anchor cable support + concrete hardening” is proposed. The floor deformation monitoring results indicate that the max. floor heave at the measurement point near the coal pillar in the roadway is 167 mm, and the floor heave is effectively controlled.

Suggested Citation

  • Deqiu Wang & Yun Zheng & Fulian He & Jiayu Song & Jianlong Zhang & Yanhao Wu & Pengpeng Jia & Xiaohui Wang & Baoping Liu & Feifei Wang & Yajiang Zhang & Kai Tao, 2023. "Mechanism and Control of Asymmetric Floor Heave in the Gob-Side Coal Roadway under Mining Pressure in Extra-Thick Coal Seams," Energies, MDPI, vol. 16(13), pages 1-19, June.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:13:p:4948-:d:1179541
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    References listed on IDEAS

    as
    1. Dongdong Chen & Fangfang Guo & Zijian Li & Xiang Ma & Shengrong Xie & Yiyi Wu & Zhiqiang Wang, 2022. "Study on the Influence and Control of Stress Direction Deflection and Partial-Stress Boosting of Main Roadways Surrounding Rock and under the Influence of Multi-Seam Mining," Energies, MDPI, vol. 15(21), pages 1-24, November.
    2. Minfu Liang & Chengjun Hu & Rui Yu & Lixin Wang & Baofu Zhao & Ziyue Xu, 2022. "Optimization of the Process Parameters of Fully Mechanized Top-Coal Caving in Thick-Seam Coal Using BP Neural Networks," Sustainability, MDPI, vol. 14(3), pages 1-17, January.
    3. Shengrong Xie & Hui Li & Dongdong Chen & Shaohua Feng & Xiang Ma & Zaisheng Jiang & Junqi Cui, 2022. "New Technology of Pressure Relief Control in Soft Coal Roadways with Deep, Violent Mining and Large Deformation: A Key Study," Energies, MDPI, vol. 15(23), pages 1-26, December.
    4. 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.
    5. 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.
    6. Fulian He & Bingquan Liu & Deqiu Wang & Dongdong Chen & Yanhao Wu & Liming Song & Xiang Ma & Qiucheng Ye & Zaisheng Jiang & Fangfang Guo & Weiguang Wang & Yiyi Wu, 2022. "Study on Stability and Control of Surrounding Rock in the Stopping Space with Fully Mechanized Top Coal Caving under Goaf," Energies, MDPI, vol. 15(22), pages 1-22, November.
    7. 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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