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Numerical Investigation on the Yield Pillar Bearing Capacity under the Two-End-Type Cable Reinforcement

Author

Listed:
  • Changhao Shan

    (School of Mines, China University of Mining and Technology, Xuzhou 221116, China
    Key Laboratory of Deep Coal Resource Mining (CUMT), Ministry of Education, Xuzhou 221116, China)

  • Shenggen Cao

    (School of Mines, China University of Mining and Technology, Xuzhou 221116, China
    Key Laboratory of Deep Coal Resource Mining (CUMT), Ministry of Education, Xuzhou 221116, China)

  • Zeyu Zhang

    (School of Mines, China University of Mining and Technology, Xuzhou 221116, China
    Key Laboratory of Deep Coal Resource Mining (CUMT), Ministry of Education, Xuzhou 221116, China)

  • Kewen Lin

    (School of Mines, China University of Mining and Technology, Xuzhou 221116, China
    Key Laboratory of Deep Coal Resource Mining (CUMT), Ministry of Education, Xuzhou 221116, China)

  • Jialong Sun

    (School of Mines, China University of Mining and Technology, Xuzhou 221116, China
    Key Laboratory of Deep Coal Resource Mining (CUMT), Ministry of Education, Xuzhou 221116, China)

Abstract

For underground coal mining techniques such as gob-side entry retaining (GER) or gob-side entry driving (GED), the stability of yield pillars is paramount. A well-designed yield pillar aims to withstand mining-induced stresses. This study delves into the impact of bi-terminal cable support on the stability of such pillars. Utilizing 30 distinct numerical models, each with varying pillar width/height (w/h) ratios and diverse cable support methodologies, our findings suggest an upward trend in both peak and residual strength in response to heightened support strength. Notably, pillars with a wider configuration exhibited a more pronounced increase in peak strength compared to their narrower counterparts, while the latter showcased a more pronounced residual strength enhancement. Additionally, the residual/peak strength ratio was smaller in narrower pillars and increased with the increase in the cable support strength. In view of the surrounding rock mass’s support stress distribution, numerical modelling was adopted to analyze the underlying support mechanism. The results showed the support stress zones extended farther on both sides of pillars with the decrease in the row spacing, which made the radial stresses rise effectively and ameliorated the coal pillar’s stress state. Finally, with the 8311 operation advancing towards the station, the deformation amplitude of the coal pillar was only 2.28%, and the stability of the coal pillar was effectively maintained.

Suggested Citation

  • Changhao Shan & Shenggen Cao & Zeyu Zhang & Kewen Lin & Jialong Sun, 2023. "Numerical Investigation on the Yield Pillar Bearing Capacity under the Two-End-Type Cable Reinforcement," Energies, MDPI, vol. 16(18), pages 1-17, September.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:18:p:6418-:d:1233199
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    References listed on IDEAS

    as
    1. Pengxiang Zhao & Wenjin Zhang & Shugang Li & Zechen Chang & Yajie Lu & Congying Cao & Yu Shi & Yongyong Jia & Fang Lou & Zongyong Wei & Jun Liu, 2022. "Numerical Simulation Study on Mechanical Characteristics and Width Optimization of Narrow Coal Pillar in Gob-Side Coal Seam Tunnel," Sustainability, MDPI, vol. 14(23), pages 1-17, November.
    2. Lifeng Li & Gan Li & Weili Gong & Jiong Wang & Huilin Deng, 2019. "Energy Evolution Pattern and Roof Control Strategy in Non-Pillar Mining Method of Goaf-Side Entry Retaining by Roof Cutting—A Case Study," Sustainability, MDPI, vol. 11(24), pages 1-18, December.
    3. Shengrong Xie & Fangfang Guo & Yiyi Wu, 2022. "Control Techniques for Gob-Side Entry Driving in an Extra-Thick Coal Seam with the Influence of Upper Residual Coal Pillar: A Case Study," Energies, MDPI, vol. 15(10), pages 1-21, May.
    4. Xizhan Yue & Min Tu & Yingfu Li & Guanfeng Chang & Chen Li, 2022. "Stability and Cementation of the Surrounding Rock in Roof-Cutting and Pressure-Relief Entry under Mining Influence," Energies, MDPI, vol. 15(3), pages 1-18, January.
    5. Qingliang Chang & Shiguo Ge & Xianyuan Shi & Yesong Sun & Haibin Wang & Mengda Li & Yizhe Wang & Fengfeng Wu, 2022. "Determination of Narrow Coal Pillar Width and Roadway Surrounding Rock Support Technology in Gob Driving Roadway," Sustainability, MDPI, vol. 14(8), pages 1-14, April.
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