Abstract
Deep buried tunnels face high in-situ stress during the construction process, which can easily trigger rock burst. Flexible protective system is an important way to achieve disaster control. Regarding the problem of low toughness and inability to resist instantaneous impacts in the existing flexible protective materials, this study develops a high-strength and high-toughness flexible geogrid based on three deformation modes that may occur when it intercepts explosive blocks. This process considers the selection of polymer fiber filaments, optimization of weaving methods, and improvement of fabric structure. The stress and deformation characteristics of flexible geogrids are analyzed through single-rib tensile, nodal peel, and static jacking tests. The tests showed that mechanical performance of the flexible geogrid can meet requirements for strong and below level rock burst. To analyze the effects of strip strength strip, elongation at break, and nodal strength on the characteristics of jacking deformation, numerical simulations are conducted based on the discrete element method. The results showed that the elongation at break is controlled within 13%, the strip strength is greater than 0.8 GPa, and the nodal strength is increased to 0.075 GPa or above, which can significantly improve the rock-burst protection ability of the flexible geogrid. Finally, the impact energy absorbed by the flexible geogrid reached 74.23 kJ through the falling ball impact experiment, and the engineering application of the flexible geogrid is achieved in the rock-burst section of the Duoji Tunnel on the CZ Railway.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
Great appreciation goes to the editorial board and the reviewers of this paper. This research was supported by the National Natural Science Foundation of China (No. 42302318) and the China Postdoctoral Science Foundation of China (No. 2023M732088).
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This work was funded by National Natural Science Foundation of China (No. 42302318) and the China Postdoctoral Science Foundation of China (No. 2023M732088).
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All the authors rces, Validation; Jinsheng Cui: Conceptualization, Validation; Meixia Wang: Writing-review & editing, Fundincontributed to publishing this paper. Yifan Bai: Methodology, Data curation, Writing-original draft; Weimin Yang: Resoug acquisition; Conng Tian: Software; Zhiyuan Zhang: Data curation, Formal analysis; Xuan Song: Project administration. All authors have read and agreed to the published version of the manuscript.
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Bai, Y., Yang, W., Cui, J. et al. Development and Mechanical Performance Study of a New Type of Flexible Protective Geogrid for Tunnel Rock Burst. Geotech Geol Eng (2024). https://doi.org/10.1007/s10706-024-02907-0
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DOI: https://doi.org/10.1007/s10706-024-02907-0