Volume 37 Issue 5
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Article Navigation >  GEOTECHNICAL ENGINEERING TECHNIQUE  > 2023  >  37(5): 524-531
Wang Haifeng, Kang Bo, Li Pengfei, Liu Zenghui, Di Qiguang, Chen Keyi. Short-term Undrained Analysis of Passive Instability of Shield Tunnel Excavation Face[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2023, 37(5): 524-531. doi: 10.3969/j.issn.1007-2993.2023.05.003
Citation: Wang Haifeng, Kang Bo, Li Pengfei, Liu Zenghui, Di Qiguang, Chen Keyi. Short-term Undrained Analysis of Passive Instability of Shield Tunnel Excavation Face[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2023, 37(5): 524-531. doi: 10.3969/j.issn.1007-2993.2023.05.003
shu

Short-term Undrained Analysis of Passive Instability of Shield Tunnel Excavation Face

doi: 10.3969/j.issn.1007-2993.2023.05.003
  • 1.

    Nantong Railway Construction Component Co., Ltd., Nantong 226000, Jiangsu, China

  • 2.

    Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing 100124, China

  • 3.

    China Aoyuan Property Group Limited, Guangzhou 511442, Guangdong, China

  • Received Date: 2022-05-02
  • Accepted Date: 2023-07-14
  • Rev Recd Date: 2023-03-24
    • Available Online: 2023-10-16
  • Publish Date: 2023-10-16
    Abstract
  • The construction environment of shield tunnel becomes more and more complex. However, there are few researches on passive instability failure modes of shield tunnel excavation face in water-rich clay stratum. A theoretical model of passive instability failure of shield excavation face under undrained effect was proposed. The unknown quantity of ultimate support force function was analyzed for homogeneous soil and layered soil respectively. After fitting the results, a theoretical calculation formula for rapid estimation of ultimate support force was given. Finally, the applicability of the model is further discussed by comparing the numerical results with the theoretical results. The results show that under the condition of shallow burial (C/D≤1.0), the boundary of the upper failure zone of the vault is approximately vertical, which is consistent with the proposed failure mode assumption. With the increase of buried depth ratio, the influence of the damaged area on the surface becomes less and less, and even the damaged area does not extend to the surface when buried deeply.

     

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