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<p>This study investigates the utility of Parallel Guide Tunnels (PGT) for stress release in the construction of deep-buried soft rock tunnels, with a specific application to the challenging Haba Snow Mountain Tunnel project. A high-fidelity numerical model, validated against field monitoring data, was employed to analyze the impact of two critical parameters: the lateral spacing between the PGT and the main tunnel, and the PGT’s advance distance. The results indicate that a spacing of 40–50&#xa0;m effectively controls support deformation in the main tunnel, while an advance distance of 100&#xa0;m ensures over 90% stress release and minimizes excavation-induced disturbances. Field application demonstrated that this PGT strategy significantly reduced deformations, particularly horizontal convergence. This research provides practical guidelines for parameter selection, offering a viable approach to enhance stability and safety in similar tunneling projects under extreme geological conditions.</p>

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Utility analysis and economic discussion of parallel guiding tunnel in deep-buried soft rock tunnels

  • 期刊论文

  • 发表日期：

    2026年2月5日

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  • Jinpeng Zhao,
  • Zhongsheng Tan,
  • Baojin Zhang,
  • Dong Ma,
  • Fengxi Wang

摘要

This study investigates the utility of Parallel Guide Tunnels (PGT) for stress release in the construction of deep-buried soft rock tunnels, with a specific application to the challenging Haba Snow Mountain Tunnel project. A high-fidelity numerical model, validated against field monitoring data, was employed to analyze the impact of two critical parameters: the lateral spacing between the PGT and the main tunnel, and the PGT’s advance distance. The results indicate that a spacing of 40–50 m effectively controls support deformation in the main tunnel, while an advance distance of 100 m ensures over 90% stress release and minimizes excavation-induced disturbances. Field application demonstrated that this PGT strategy significantly reduced deformations, particularly horizontal convergence. This research provides practical guidelines for parameter selection, offering a viable approach to enhance stability and safety in similar tunneling projects under extreme geological conditions.