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<p>During tunnel excavation, the adjacent roadbed and pile foundations frequently encounter significant disturbance, which may compromise the stability of the existing structures. Consequently, when excavating in proximity to roadbeds and pile foundations, effective reinforcement measures must be implemented to mitigate construction risks and prevent casualties. Taking the Beitouling tunnel as a case study, this paper first investigated the stress–strain evolution patterns of completely decomposed granite at different moisture contents through laboratory triaxial compression tests. Subsequently, numerical simulation methods were applied to analyse the adjacent influence patterns of tunnel excavation on the roadbed and pile foundations. Finally, the feasibility of employing super-long interlocked pipe roof to mitigate disturbances to the roadbed and pile foundations during excavation was examined. The results indicated that the ultimate stress of completely decomposed granite exhibited an initial increase followed by a decrease with rising moisture content. At 30% moisture content, both the vertical displacement of the roadbed and the horizontal displacement of the pile foundations reached their maximum values at 689.88&#xa0;mm and 17.43&#xa0;mm, respectively. Compared to the roadbed, the adjacent influence of tunnel excavation on the pile foundations was comparatively minor. At moisture contents between 15 and 30%, the adjacent influence zones for the roadbed and pile foundations were 6–66&#xa0;m and 14–26&#xa0;m, respectively. Following reinforcement with a super-long interlocked pipe roof, both the roadbed and pile foundation exhibited no adjacent influence. The arching effect and interlocking effect of the super-long interlocked pipe roof were key factors in reducing the adjacent influence zone range and enhancing the safety of the lining structure, roadbed, and pile foundation.</p>

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Construction Disturbance Effects of Tunnelling in Completely Decomposed Granite and Reinforcement Using Interlocked Pipe Roofs

  • 期刊论文

  • 发表日期：

    2026年2月21日

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  • Junfu Fu,
  • Maoquan Ning,
  • Junru Zhang,
  • Ziyan Fan,
  • Jintao Fu,
  • Yangfan Wu,
  • Xuehui Jin,
  • Jimeng Feng,
  • Yumeng Liu

摘要

During tunnel excavation, the adjacent roadbed and pile foundations frequently encounter significant disturbance, which may compromise the stability of the existing structures. Consequently, when excavating in proximity to roadbeds and pile foundations, effective reinforcement measures must be implemented to mitigate construction risks and prevent casualties. Taking the Beitouling tunnel as a case study, this paper first investigated the stress–strain evolution patterns of completely decomposed granite at different moisture contents through laboratory triaxial compression tests. Subsequently, numerical simulation methods were applied to analyse the adjacent influence patterns of tunnel excavation on the roadbed and pile foundations. Finally, the feasibility of employing super-long interlocked pipe roof to mitigate disturbances to the roadbed and pile foundations during excavation was examined. The results indicated that the ultimate stress of completely decomposed granite exhibited an initial increase followed by a decrease with rising moisture content. At 30% moisture content, both the vertical displacement of the roadbed and the horizontal displacement of the pile foundations reached their maximum values at 689.88 mm and 17.43 mm, respectively. Compared to the roadbed, the adjacent influence of tunnel excavation on the pile foundations was comparatively minor. At moisture contents between 15 and 30%, the adjacent influence zones for the roadbed and pile foundations were 6–66 m and 14–26 m, respectively. Following reinforcement with a super-long interlocked pipe roof, both the roadbed and pile foundation exhibited no adjacent influence. The arching effect and interlocking effect of the super-long interlocked pipe roof were key factors in reducing the adjacent influence zone range and enhancing the safety of the lining structure, roadbed, and pile foundation.