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Study on Stability and Control of Surrounding Rock in the Stopping Space with Fully Mechanized Top Coal Caving under Goaf

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  • Fulian He

    (School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
    Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining & Technology (Beijing), Beijing 100083, China)

  • Bingquan Liu

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

  • Deqiu Wang

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

  • Dongdong Chen

    (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)

  • Liming Song

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

  • Xiang Ma

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

  • Qiucheng Ye

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

  • Zaisheng Jiang

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

  • Fangfang Guo

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

  • Weiguang Wang

    (Jinneng Holding Group, Datong 037000, China)

  • Yiyi Wu

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

Abstract

Under the condition of fully mechanized top coal caving in close-distance coal seams, the surrounding rock of the stopping space easily loses stability during the withdrawal of mining equipment in the working face because the lower coal seam working face is located under the goaf and the overburden rock has a large range of complex interaction. Field investigation, theoretical analysis, laboratory experiment, similar simulation experiment, numerical simulation, and field industrial tests are used to carry out the research on the stability and control of the surrounding rock in the large section stopping space under the goaf in this paper. The research conclusions are as follows. (1) It is determined that the lower coal seam working face can only stop mining under the goaf, and the reasonable stopping position under the goaf should ensure that the key block fracture line of the main roof is behind the support. (2) The interaction law between the main roof’s key blocks of the upper and lower coal seams is analyzed, and the catastrophic conditions for sliding instability and rotary instability of the main roof’s key blocks of the upper and lower coal seams are obtained. (3) “Anchorage with push and pull equipment-Embedded anchorages and trays” integral anchoring technology is developed. The dimensions of the push and pull equipment are determined. (4) Through numerical simulation of the distribution characteristics of the anchor cable pre-stress field, the asymmetric control scheme of “Partition long and short anchor cables + Integral polyurethane mesh + Embedded anchorages and trays for roof protection” is determined. The rock pressure observation shows that the withdrawal of the working face equipment is implemented safely.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:22:p:8498-:d:972186
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    References listed on IDEAS

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    2. 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.
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    Cited by:

    1. 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.

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