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Surrounding Rocks Deformation Mechanism and Roof Cutting-Grouting Joint Control Technology for Soft and Thick Coal Seam Roadway

Author

Listed:
  • Xutong Zhang

    (School of Mines, China University of Mining and Technology, Xuzhou 221116, China
    State Key Laboratory of Coal Resources and Safe Mining (CUMT), Xuzhou 221116, China)

  • Fangtian Wang

    (School of Mines, China University of Mining and Technology, Xuzhou 221116, China
    State Key Laboratory of Coal Resources and Safe Mining (CUMT), Xuzhou 221116, China)

  • Hongfei Qu

    (School of Mines, China University of Mining and Technology, Xuzhou 221116, China
    State Key Laboratory of Coal Resources and Safe Mining (CUMT), Xuzhou 221116, China)

  • Chao Liu

    (School of Mines, China University of Mining and Technology, Xuzhou 221116, China
    State Key Laboratory of Coal Resources and Safe Mining (CUMT), Xuzhou 221116, China)

  • Zhe Li

    (Beijing Longruan Technologies Co., Ltd., Beijing 100011, China)

  • Wenhua Hao

    (School of Mines, China University of Mining and Technology, Xuzhou 221116, China
    State Key Laboratory of Coal Resources and Safe Mining (CUMT), Xuzhou 221116, China)

Abstract

High-efficiency maintenance and control of the deep coal roadway surrounding rock stability is a reliable guarantee for the sustainable development of a coal mine. However, it is difficult to control the stability of a roadway in soft and thick coal beds. To maintain the roadway with soft and thick coal beds under strong mining effect, the novel technology of “anchor bolt (cable) support-presplitting-grouting” is proposed. In this technique, the surface of the surrounding rock was supported by high-strength anchor bolts (cables) and metal mesh to prevent the rocks from falling off; pre-splitting roof cutting was adopted to improve the stress state of deep-part surrounding rocks, and the grouting reinforcement technology was used to reduce fractures and improve lithology. To investigate the deformation characteristics of surrounding rocks under this special condition, the equivalent load calculation model of stress distribution in roadway surrounding rocks was established, and the key area of roadway deformation and instability was defined. According to the theoretical model, the UDEC 7.0 software was employed to analyze the impacts of roof cutting depth, angle, and distance of presplitting kerf on the surrounding rock deformation. Based on the data analysis for simulation results with the Response Surface Method (RSM), the influences of single factors and multi-factor horizontal interactions on the stability of surrounding rocks and the internal causes were analyzed, and the optimal cutting parameters were ultimately defined. The in situ application of this technology shows that the fractures on the coal pillar side and the shear failure of surrounding rocks in the bed were effectively controlled, which provides a reference for roadway control under similar conditions.

Suggested Citation

  • Xutong Zhang & Fangtian Wang & Hongfei Qu & Chao Liu & Zhe Li & Wenhua Hao, 2023. "Surrounding Rocks Deformation Mechanism and Roof Cutting-Grouting Joint Control Technology for Soft and Thick Coal Seam Roadway," Sustainability, MDPI, vol. 15(21), pages 1-23, October.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:21:p:15415-:d:1270266
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    References listed on IDEAS

    as
    1. Xinfeng Wang & Yiying Zhang & Qiao Zhang & Youyu Wei & Wengang Liu & Tian Jiang, 2022. "Space-Time Evolution Characteristics of Deformation and Failure of Surrounding Rock in Deep Soft Rock Roadway," Sustainability, MDPI, vol. 14(19), pages 1-21, October.
    2. Yuantian Sun & Guichen Li & Junfei Zhang & Junbo Sun & Jiandong Huang & Reza Taherdangkoo, 2021. "New Insights of Grouting in Coal Mass: From Small-Scale Experiments to Microstructures," Sustainability, MDPI, vol. 13(16), pages 1-17, August.
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