Geomechanics and Engineering

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Analysis of stability control and the adapted ways for building tunnel anchors and a down-passing tunnel

  • Xiaohan Zhou (Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing University) ;
  • Xinrong Liu (Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing University) ;
  • Yu Xiao (Chongqing City Infrastructure Construction LTD) ;
  • Ninghui Liang (Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing University) ;
  • Yangyang Yang (Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing University) ;
  • Yafeng Han (Chongqing Jiaotong University) ;
  • Zhongping Yang (Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing University)
  • Received : 2023.07.09
  • Accepted : 2023.11.01
  • Published : 2023.11.25
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Abstract

Long-span suspension bridges have tunnel anchor systems to maintain stable cables. More investigations are required to determine how closely tunnel excavation beneath the tunnel anchor impacts the stability of the tunnel anchor. In order to investigate the impact of the adjacent tunnel's excavation on the stability of the tunnel anchor, a large-span suspension bridge tunnel anchor is utilised as an example in a three-dimensional numerical simulation approach. In order to explore the deformation control mechanism, orthogonal tests are employed to pinpoint the major impacting elements. The construction of an advanced pipe shed, strengthening the primary support. Moreover, according to the findings the grouting reinforcement of the surrounding rock, have a significant control effect on the settlement of the tunnel vault and plug body. However, reducing the lag distance of the secondary lining does not have such big influence. The greatest way to control tunnel vault settling is to use the grout reinforcement, which increases the bearing capacity and strength of the surrounding rock. This greatly minimizes the size of the tunnel excavation disturbance area. Advanced pipe shed can not only increase the surrounding rock's bearing capacity at the pipe shed, but can also prevent the tunnel vault from connecting with the disturbance area at the bottom of the anchorage tunnel, reduce the range of shear failure area outside the anchorage tunnel, and have the best impact on the plug body's settlement control.

Keywords

Acknowledgement

The study is supported by National Natural Science Foundation of China (Grant No. 41772319, 41972266) and Graduate Scientific Research and Innovation Foundation of Chongqing, China (Grant No. CYB20031). The authors gratefully acknowledge these supports.

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