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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

Author

Listed:
  • Shixing Cheng

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining & Technology, Xuzhou 221116, China)

  • Zhanguo Ma

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining & Technology, Xuzhou 221116, China)

  • Peng Gong

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining & Technology, Xuzhou 221116, China)

  • Kelong Li

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining & Technology, Xuzhou 221116, China)

  • Ning Li

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining & Technology, Xuzhou 221116, China)

  • Tuo Wang

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining & Technology, Xuzhou 221116, China)

Abstract

In longwall mining of coal mines, the large deformation of small pillar retaining roadways creates difficulties for the safe and efficient retreating of the mining panel. Based on the engineering background of a small coal pillar retaining roadway in Wangzhuang coal mine, pressure relief technology for non-penetrating directional pre-splitting blasting with a deep hole ahead was proposed. The influence of the non-penetrating fracture length on the pre-splitting effect was studied by numerical simulation. The results showed that the vertical stress in the coal pillar center, the small pillar retaining roadway deformation, and the energy accumulation on the pillar decreased with an increase in the non-penetrating fracture length. The vertical stress at the working face end increased with an increase in the non-penetrating fracture length. The field application and monitoring results indicated that non-penetrating directional pre-splitting blasting could effectively control the deformation of small pillar retaining roadways. The roof-to-floor and rib-to-rib maximum convergences of the 6208 tail entry were reduced by 53.66% and 52.62%, respectively, compared to the results with no blasting. The roadway section met the demands of mining panel high-efficiency retreating, thereby demonstrating the rationality of the technical and numerical simulation results. The research results shed light on the improvement of small coal pillar retaining roadway maintenance theory and technology.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:12:p:3084-:d:371710
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    References listed on IDEAS

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    1. Guorui Feng & Pengfei Wang & Yoginder P. Chugh, 2018. "A New Gob-Side Entry Layout for Longwall Top Coal Caving," Energies, MDPI, vol. 11(5), pages 1-24, May.
    2. 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.
    3. 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.
    4. Xinyue Li & Nong Zhang & Zhengzheng Xie & Dongxu Liang & Yiming Zhao, 2019. "Study on Efficient Utilization Technology of Coal Pillar Based on Gob-Side Entry Driving in a Coal Mine with Great Depth and High Production," Sustainability, MDPI, vol. 11(6), pages 1-22, March.
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    Cited by:

    1. Qiang Fu & Ke Yang & Xiang He & Zhen Wei & Qinggan Yang, 2022. "Characteristics of Strata Behavior and Differentiated Control of Fully Mechanized Mining Working Face with Abnormal Roof," Sustainability, MDPI, vol. 14(20), pages 1-15, October.
    2. 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.

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