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New Technology of Pressure Relief Control in Soft Coal Roadways with Deep, Violent Mining and Large Deformation: A Key Study

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  • Shengrong Xie

    (School of Energy and 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)

  • Hui Li

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

  • Dongdong Chen

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

  • Shaohua Feng

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

  • Xiang Ma

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

  • Zaisheng Jiang

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

  • Junqi Cui

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

Abstract

Previous studies have shown that the influence of deep dynamic pressure on the surrounding rock control of a coal roadway is one of the difficulties in mine roadway support. Based on the investigation of the headgate 11231 in a coal mine, this study analyzes the damage characteristics of coal roadway surrounding rock affected by deep dynamic pressure, expounds on the difficulties of controlling the roadway surrounding rock, and creatively proposes a cooperative control technology of external anchor–internal unloading for regulating large deformation of roadways. The vertical stress distribution and transfer law of surrounding rock with different hole-making depths, spacing, and lengths after roadway excavation were simulated and studied, and an appropriate parameter range of hole-making space in the stage without dynamic pressure influence was obtained. Considering the influence of mining dynamic pressure, the surrounding rock pressure relief effect of each optimized hole-making parameter was analyzed. In addition, the optimal hole-making parameters (the hole-making depth, spacing, and length were 8 m, 3.2 m, and 3 m, respectively) that can effectively reduce the high stress of roadway shallow surrounding rock in two stages (without and with dynamic pressure) and ensure integrity of the shallow surrounding rock were obtained. The actual field application shows that the new technology can reduce the higher rib deformation by approximately 850 mm and achieve a good surrounding rock control effect. The research and practice show that the pressure relief control for soft coal roadways with deep, violent mining and large deformation has achieved success, providing technical support for the maintenance of the same type of roadway.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:23:p:9208-:d:993868
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    References listed on IDEAS

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    1. 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.
    2. Shengrong Xie & Yiyi Wu & Fangfang Guo & Hang Zou & Dongdong Chen & Xiao Zhang & Xiang Ma & Ruipeng Liu & Chaowen Wu, 2022. "Application of Pre-Splitting and Roof-Cutting Control Technology in Coal Mining: A Review of Technology," Energies, MDPI, vol. 15(17), pages 1-20, September.
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    Cited by:

    1. Yuxi Hao & Mingliang Li & Wen Wang & Zhizeng Zhang & Zhun Li, 2023. "Study on the Stress Distribution and Stability Control of Surrounding Rock of Reserved Roadway with Hard Roof," Sustainability, MDPI, vol. 15(19), pages 1-21, September.
    2. 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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