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<p>The issues of high costs and low efficiency caused by the excavation of large-section tunnels in sandy-mudstone strata have not been resolved, especially since these strata are characterized by low strength and high susceptibility to disturbance, leading to a significant collapse risk. Simulations are conducted for the double sidewall drift method, the central drift method, and the double bench method, and the excavation methodology is optimized, thereby addressing the construction challenges associated with excavating large-section tunnels in sandy-mudstone strata. Using FLAC3D simulations, it analyzes surface settlement, deformation patterns, face extrusion, stress distribution, and plastic zone evolution. Results show minimal differences in control indicators among the methods, with the double bench method offering superior efficiency and simpler section division. Optimizing the lower bench excavation sequence significantly reduces crown settlement, floor uplift, and horizontal convergence by 50.4%, 39.6%, and 57.8%, respectively, while accelerating deformation stabilization. Stress concentration is found at the haunch, where reinforcement using grouting, high-strength bolts, and steel mesh is recommended. The findings provide valuable guidance for similar tunnel projects.</p>

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Optimisation of Construction Methods for Large-Section Tunnels in Weak Sandy Mudstone Strata

  • 期刊论文

  • 发表日期：

    2025年11月18日

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  • Weipeng Pan,
  • Yuchao Zheng,
  • Jiahao Min,
  • Liang Luo,
  • Xiang He

摘要

The issues of high costs and low efficiency caused by the excavation of large-section tunnels in sandy-mudstone strata have not been resolved, especially since these strata are characterized by low strength and high susceptibility to disturbance, leading to a significant collapse risk. Simulations are conducted for the double sidewall drift method, the central drift method, and the double bench method, and the excavation methodology is optimized, thereby addressing the construction challenges associated with excavating large-section tunnels in sandy-mudstone strata. Using FLAC3D simulations, it analyzes surface settlement, deformation patterns, face extrusion, stress distribution, and plastic zone evolution. Results show minimal differences in control indicators among the methods, with the double bench method offering superior efficiency and simpler section division. Optimizing the lower bench excavation sequence significantly reduces crown settlement, floor uplift, and horizontal convergence by 50.4%, 39.6%, and 57.8%, respectively, while accelerating deformation stabilization. Stress concentration is found at the haunch, where reinforcement using grouting, high-strength bolts, and steel mesh is recommended. The findings provide valuable guidance for similar tunnel projects.