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<p>The current study details the design and construction of a large-diameter (12.6&#xa0;m) tunnel beneath a low overburden of 0.5&#xa0;m to 7&#xa0;m, with existing major utilities and an operational road at the surface, for India’s first High-Speed Rail Project. The study examines the associated challenges for large diameter tunnel construction in shallow mixed ground conditions, and discusses the subsequent design of pre-support measures for the conventional tunnelling. Initial tunnel stability assessment suggested instability of the unsupported length with safety factor of 0.58, thereby causing ground deformations of over 100&#xa0;mm due to it and requiring support force of over 4400 kN for the face stability. Owing to site constraints, pre-support measures using Umbrella Arch Method, with pipe-roofing, face bolting and steel ribs, were designed to ensure the stability during tunnelling. The design checks using closed form solutions and global stability analyses using numerical methods (2D and 3D), confirmed the stability of face and the unsupported length of the tunnel with the use of pre-support measures. The numerical analyses also confirmed the ground deformations in range of 10&#xa0;mm to 18&#xa0;mm, which were then validated during construction using the field instrumentation and monitoring. The current study, through design analysis and construction monitoring, appraises the application of conventional tunnelling with the Umbrella Arch Method for large-diameter urban tunnel construction in shallow and mixed ground conditions.</p>

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Design and Construction of a Large-Diameter Low-Overburden Tunnel for High-Speed Rail Project

  • 期刊论文

  • 发表日期：

    2026年7月4日

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  • Uday Prasad Singh,
  • Krishan Singh,
  • Animesh Sharma

摘要

The current study details the design and construction of a large-diameter (12.6 m) tunnel beneath a low overburden of 0.5 m to 7 m, with existing major utilities and an operational road at the surface, for India’s first High-Speed Rail Project. The study examines the associated challenges for large diameter tunnel construction in shallow mixed ground conditions, and discusses the subsequent design of pre-support measures for the conventional tunnelling. Initial tunnel stability assessment suggested instability of the unsupported length with safety factor of 0.58, thereby causing ground deformations of over 100 mm due to it and requiring support force of over 4400 kN for the face stability. Owing to site constraints, pre-support measures using Umbrella Arch Method, with pipe-roofing, face bolting and steel ribs, were designed to ensure the stability during tunnelling. The design checks using closed form solutions and global stability analyses using numerical methods (2D and 3D), confirmed the stability of face and the unsupported length of the tunnel with the use of pre-support measures. The numerical analyses also confirmed the ground deformations in range of 10 mm to 18 mm, which were then validated during construction using the field instrumentation and monitoring. The current study, through design analysis and construction monitoring, appraises the application of conventional tunnelling with the Umbrella Arch Method for large-diameter urban tunnel construction in shallow and mixed ground conditions.