Volume 39 Issue 1
Feb.  2025
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Wei Kanglin, Zhu Yu, Luo Yehua, Yan Xiaozhou, Xu Lanyue, Li Hongbin, Zeng Yong. Reinforcement effect of middle partition wall in ultra-small spacing section of subway shield tunnel[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(1): 63-71. doi: 10.20265/j.cnki.issn.1007-2993.2023-0801
Citation: Wei Kanglin, Zhu Yu, Luo Yehua, Yan Xiaozhou, Xu Lanyue, Li Hongbin, Zeng Yong. Reinforcement effect of middle partition wall in ultra-small spacing section of subway shield tunnel[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(1): 63-71. doi: 10.20265/j.cnki.issn.1007-2993.2023-0801

Reinforcement effect of middle partition wall in ultra-small spacing section of subway shield tunnel

doi: 10.20265/j.cnki.issn.1007-2993.2023-0801
  • Received Date: 2023-10-21
  • Accepted Date: 2024-03-11
  • Rev Recd Date: 2023-12-14
  • Publish Date: 2025-02-21
  • To explore the reinforcement effect of the middle partition wall in the ultra-small spacing section of the subway shield tunnel, based on the entrance and exit line project of the south parking lot of Guangzhou Metro Line 12, the FLAC 3D software was used to establish the simulation model of the shield tunnel construction, and to analyze the influence law of the ultra-small spacing shield tunnel construction on the surrounding rock and soil mass and the pre-built tunnel under the condition of unreinforced and middle partition wall reinforcement. The results show that with the increase of shield excavation depth, the surface settlement, the horizontal displacement of soil and the deformation of the tunnel segment were obviously increased, and the stability of the middle rock column was reduced. The reinforcement effect of the middle partition wall was remarkable. Compared with the unreinforced condition, when the project was excavated to the 19th ring, the maximum surface settlement and horizontal displacement of the soil were reduced by 31.1% and 70%, respectively. The maximum lateral expansion and vertical deformation of the first tunnel segment were reduced by 56.8% and 73.5%, respectively. The stability of the middle rock column was obviously improved. Therefore, the middle partition wall can play a good reinforcement effect in the ultra-small clear distance section.

     

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