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An Innovative Approach for Gob-Side Entry Retaining in Thick Coal Seam Longwall Mining

Author

Listed:
  • Manchao He

    (State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Beijing 100083, China
    These authors contributed equally to this work.)

  • Yubing Gao

    (State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Beijing 100083, China
    School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing 100083, China
    These authors contributed equally to this work.)

  • Jun Yang

    (State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Beijing 100083, China
    School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing 100083, China)

  • Weili Gong

    (State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Beijing 100083, China
    School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing 100083, China)

Abstract

Gob-side entry retaining (GER) is a popular non-pillar mining technique regarding how to reserve a gateroad for the use of next panel mining. When used in thick coal seams, the conventional entry retaining method requires a huge amount of filling materials and may cause entry (gateroad) accidents. Thus, an innovative non-pillar longwall mining approach is introduced. First, structural and mechanical models were built to explore the mechanism of the new approach. The modeling results indicate that effective bulking of the gob roof and reasonable support of the entry roof were key governing factors in improving entry stabilities and reducing roof deformations. Accordingly, a directional roof fracturing technique was proposed to contribute to gob roof caving, and a constant resistance and large deformation anchor (CRLDA) cable was used to stabilize the entry roof. Subsequently, the evolutionary laws of the roof structure and stresses were explored using numerical simulation. It was found that the structure of the surrounding rocks around the retained entry changed significantly after roof fracturing. The stress-bearing center was transferred to the gob area, and the entry roof was in a low stress environment after adopting the approach. Finally, the approach was tested on a thick coal seam longwall mining panel. Field monitoring indicates that the retained entry was in a stable state and the index of the retained entry met the requirement of the next mining panel. This work provides an effective and economical approach to non-pillar longwall mining in thick coal seams.

Suggested Citation

  • Manchao He & Yubing Gao & Jun Yang & Weili Gong, 2017. "An Innovative Approach for Gob-Side Entry Retaining in Thick Coal Seam Longwall Mining," Energies, MDPI, vol. 10(11), pages 1-22, November.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:11:p:1785-:d:117773
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    References listed on IDEAS

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    1. Lechner, Alex Mark & Kassulke, Owen & Unger, Corinne, 2016. "Spatial assessment of open cut coal mining progressive rehabilitation to support the monitoring of rehabilitation liabilities," Resources Policy, Elsevier, vol. 50(C), pages 234-243.
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    Cited by:

    1. Wenqiang Mu & Lianchong Li & Zhongping Guo & Zhaowen Du & Sixu Wang, 2019. "Novel Segmented Roadside Plugging-Filling Mining Method and Overlying Rock Mechanical Mechanism Analyses," Energies, MDPI, vol. 12(11), pages 1-20, May.
    2. Zimin Ma & Jiong Wang & Manchao He & Yubing Gao & Jinzhu Hu & Qiong Wang, 2018. "Key Technologies and Application Test of an Innovative Noncoal Pillar Mining Approach: A Case Study," Energies, MDPI, vol. 11(10), pages 1-22, October.
    3. Xiaoping Xie & Hongyang Liu & Xinqiu Fang & Junwei Yang & Jiangang Liu & Minfu Liang & Gang Wu, 2023. "Deformation Mechanism and Control Technology of Surrounding Rock of Three-Soft Coal Roadways under High Horizontal Stress," Energies, MDPI, vol. 16(2), pages 1-23, January.
    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. Yajun Wang & Yubing Gao & Eryu Wang & Manchao He & Jun Yang, 2018. "Roof Deformation Characteristics and Preventive Techniques Using a Novel Non-Pillar Mining Method of Gob-Side Entry Retaining by Roof Cutting," Energies, MDPI, vol. 11(3), pages 1-17, March.
    6. Krzysztof Skrzypkowski & Waldemar Korzeniowski & Krzysztof Zagórski & Anna Zagórska, 2020. "Adjustment of the Yielding System of Mechanical Rock Bolts for Room and Pillar Mining Method in Stratified Rock Mass," Energies, MDPI, vol. 13(8), pages 1-23, April.
    7. Peng Li & Xingping Lai & Peilin Gong & Chao Su & Yonglu Suo, 2020. "Mechanisms and Applications of Pressure Relief by Roof Cutting of a Deep-Buried Roadway near Goafs," Energies, MDPI, vol. 13(21), pages 1-16, November.
    8. Xuming Zhou & Haotian Li & Xuelong Li & Jianwei Wang & Jingjing Meng & Mingze Li & Chengwei Mei, 2022. "Research on Gob-Side Entry Retaining Mining of Fully Mechanized Working Face in Steeply Inclined Coal Seam: A Case in Xinqiang Coal Mine," Sustainability, MDPI, vol. 14(16), pages 1-16, August.
    9. Qiong Wang & Zhibiao Guo & Chun Zhu & Songyang Yin & Dawei Yin, 2021. "The Deformation Characteristics and Lateral Stress of Roadside Crushed Rocks with Different Particles in Non-Pillar Coal Mining," Energies, MDPI, vol. 14(13), pages 1-14, June.
    10. Jinzhu Hu & Manchao He & Jiong Wang & Zimin Ma & Yajun Wang & Xingyu Zhang, 2019. "Key Parameters of Roof Cutting of Gob-Side Entry Retaining in a Deep Inclined Thick Coal Seam with Hard Roof," Energies, MDPI, vol. 12(5), pages 1-19, March.
    11. Dong Wang & Yujing Jiang & Xiaoming Sun & Hengjie Luan & Hui Zhang, 2019. "Nonlinear Large Deformation Mechanism and Stability Control of Deep Soft Rock Roadway: A Case Study in China," Sustainability, MDPI, vol. 11(22), pages 1-20, November.
    12. Zhenqian Ma & Dongyue Zhang & Yunqin Cao & Wei Yang & Biao Xu, 2022. "Study of Key Technology of Gob-Side Entry Retention in a High Gas Outburst Coal Seam in the Karst Mountain Area," Energies, MDPI, vol. 15(11), pages 1-21, June.
    13. Xiaoyu Liu & Manchao He & Jiong Wang & Zimin Ma, 2021. "Research on Non-Pillar Coal Mining for Thick and Hard Conglomerate Roof," Energies, MDPI, vol. 14(2), pages 1-14, January.
    14. 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.
    15. Zhibiao Guo & Weitao Li & Songyang Yin & Dongshan Yang & Zhibo Ma, 2021. "An Innovative Technology for Monitoring the Distribution of Abutment Stress in Longwall Mining," Energies, MDPI, vol. 14(2), pages 1-22, January.
    16. Jianhang Chen & Baoyang Wu & Peng Li & Guojun Zhang & Yong Yuan, 2022. "A Review of the Force-Transferring Mechanism of Entirely Grouted Cable Tendons Performed with Experimental Pull Tests," Sustainability, MDPI, vol. 14(24), pages 1-20, December.
    17. Sari Melati & Ridho Kresna Wattimena & David Prambudi Sahara & Syafrizal & Ganda Marihot Simangunsong & Wahyu Hidayat & Erwin Riyanto & Raden Roro Shinta Felisia, 2022. "Block Caving Mining Method: Transformation and Its Potency in Indonesia," Energies, MDPI, vol. 16(1), pages 1-36, December.
    18. Xingyu Zhang & Liang Chen & Yubing Gao & Jinzhu Hu & Jun Yang & Manchao He, 2019. "Study of An Innovative Approach of Roof Presplitting for Gob-Side Entry Retaining in Longwall Coal Mining," Energies, MDPI, vol. 12(17), pages 1-16, August.
    19. Krzysztof Skrzypkowski & Waldemar Korzeniowski & Krzysztof Zagórski & Anna Zagórska, 2020. "Modified Rock Bolt Support for Mining Method with Controlled Roof Bending," Energies, MDPI, vol. 13(8), pages 1-20, April.
    20. Ling Dong & Dong Wang & Xiaoming Sun & Yujing Jiang & Hengjie Luan & Huichen Xu & Baocheng Li & Feng Cai, 2023. "Large-Deformation Failure Mechanism and Stability Control of a Swelling Soft Rock Roadway in a Sea Area: A Case Study in Eastern China," Sustainability, MDPI, vol. 15(6), pages 1-12, March.
    21. Xinshuai Shi & Hongwen Jing & Zhenlong Zhao & Yuan Gao & Yuanchao Zhang & Ruodi Bu, 2020. "Physical Experiment and Numerical Modeling on the Failure Mechanism of Gob-Side Entry Driven in Thick Coal Seam," Energies, MDPI, vol. 13(20), pages 1-24, October.
    22. Shixing Cheng & Zhanguo Ma & Peng Gong & Kelong Li & Ning Li & Tuo Wang, 2020. "Controlling the Deformation of a Small Coal Pillar Retaining Roadway by Non-Penetrating Directional Pre-Splitting Blasting with a Deep Hole: A Case Study in Wangzhuang Coal Mine," Energies, MDPI, vol. 13(12), pages 1-23, June.
    23. Bo Wang & Sitao Zhu & Fuxing Jiang & Jinhai Liu & Xiaoguang Shang & Xiufeng Zhang, 2020. "Investigating the Width of Isolated Coal Pillars in Deep Hard-Strata Mines for Prevention of Mine Seismicity and Rockburst," Energies, MDPI, vol. 13(17), pages 1-18, August.
    24. Xiaojie Yang & Eryu Wang & Xingen Ma & Guofeng Zhang & Ruifeng Huang & Haopeng Lou, 2019. "A Case Study on Optimization and Control Techniques for Entry Stability in Non-Pillar Longwall Mining," Energies, MDPI, vol. 12(3), pages 1-17, January.

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