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Study on the Mechanism of Surrounding Rock Deformation and Its Control for Roof Cutting Retained Gob-Side Entry in Close-Distance Coal Seams Co-Mining

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  • Yongkang Yang

    (Key Laboratory of In-Situ Property-Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
    State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology (Beijing), Beijing 100083, China)

  • Xuecong Xu

    (Key Laboratory of In-Situ Property-Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China)

  • Chenlong Wang

    (Key Laboratory of In-Situ Property-Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China)

Abstract

Sustainable development in coal mining requires a continuous and efficient method of coal extraction. Research shows that gob-side entries retained through roof cutting retained gob-side (RCGE) are vital for improving mining efficiency, enhancing coal recovery rates, and enabling continuous production. However, the mechanism of surrounding rock deformation during close-distance co-mining of coal seams with this technique is not yet clear. For the Jiaokou coal mine in China, due to an unreasonable stagger distance between upper and lower working faces, the gob-side entries retained at the 9102 tailgate and 10102 headgate experience severe rock pressure, leading to significant prop damage and a sharp reduction in the cross-section of the entry. This greatly hampers the reuse of these entries. To investigate this issue, we established a model to study the stress distribution of surrounding rocks at different stagger distances (20 m, 40 m, 60 m, 80 m, and 120 m) through numerical simulation and optimized the support parameters for the retained entries. Our research found that when the subsidence of the roof in the upper coal seam exceeds 0.74 m but is less than 1.33 m, there is sliding instability in the mining body. When the subsidence exceeds 1.33 m, the mining body will rotate and deform, causing significant mining pressure within the retained entry. A stagger distance of 40 m between the upper and lower working faces can reduce pressure on the face during the mining of the lower coal seam. Extensive field measurements of rock pressure revealed that the damage rate of the single column in the gob-side entries of the upper and lower coal seams does not exceed 5% and 1%, respectively. In summary, this study provides a practical method to reduce damage to entries during the mining process, thereby increasing the continuous production capability of the coal mine. This is critical for the sustainable development of coal mining.

Suggested Citation

  • Yongkang Yang & Xuecong Xu & Chenlong Wang, 2023. "Study on the Mechanism of Surrounding Rock Deformation and Its Control for Roof Cutting Retained Gob-Side Entry in Close-Distance Coal Seams Co-Mining," Energies, MDPI, vol. 16(11), pages 1-17, May.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:11:p:4379-:d:1157937
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    References listed on IDEAS

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    1. Krzysztof Skrzypkowski & Waldemar Korzeniowski & Krzysztof Zagórski & Anna Zagórska, 2019. "Flexibility and Load-Bearing Capacity of Roof Bolting as Functions of Mounting Depth and Hole Diameter," Energies, MDPI, vol. 12(19), pages 1-23, September.
    2. Krzysztof Skrzypkowski, 2020. "Case Studies of Rock Bolt Support Loads and Rock Mass Monitoring for the Room and Pillar Method in the Legnica-Głogów Copper District in Poland," Energies, MDPI, vol. 13(11), pages 1-20, June.
    3. Kai Wang & Yanli Huang & Huadong Gao & Wen Zhai & Yongfeng Qiao & Junmeng Li & Shenyang Ouyang & Wei Li, 2020. "Recovery Technology of Bottom Coal in the Gob-Side Entry of Thick Coal Seam Based on Floor Heave Induced by Narrow Coal Pillar," Energies, MDPI, vol. 13(13), pages 1-20, July.
    4. Yongqiang Zhang & Xiangyu Wang & Feiteng Zhang & Menglong Li & Guanghui Wang & Dingchao Chen & Guanjun Li & Xiangqian Zhao, 2023. "Retracement Ground Pressure Appearance and Control of the Working Face under the Overlying Residual Pillar: A Case Study," Energies, MDPI, vol. 16(4), pages 1-21, February.
    5. Krzysztof Skrzypkowski, 2019. "The Influence of Room and Pillar Method Geometry on the Deposit Utilization Rate and Rock Bolt Load," Energies, MDPI, vol. 12(24), pages 1-15, December.
    6. Alexander Vitalevich Martirosyan & Yury Valerievich Ilyushin, 2022. "The Development of the Toxic and Flammable Gases Concentration Monitoring System for Coalmines," Energies, MDPI, vol. 15(23), pages 1-13, November.
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