盾构隧道管片结构螺栓失效对横向地震响应的影响分析

Analysis of the Influence of Bolt Failure of Shield Tunnel Segment Structure on Transverse Seismic Response

  • 摘要: 盾构隧道管片接头是整个隧道的薄弱部位,接头连接螺栓失效会直接影响隧道结构的服役性能。为研究盾构隧道环向螺栓失效对隧道管片结构横向抗震性能的影响,以某大断面盾构隧道为工程背景建立盾构隧道单、双层衬砌三维有限元模型,采用隐式动力时程法进行抗震性能分析。研究结果表明,环向螺栓失效会导致隧道横向变形及峰值损伤增大,施加二次衬砌可提高隧道抵抗横向变形的能力,并有效降低隧道的峰值损伤,但隧道的损伤范围增大;环向螺栓失效时,施加二次衬砌可提升管片内钢筋笼力学性能发挥程度;对于存在环向螺栓失效风险的区段,建议施加二次衬砌以提高隧道抗震性能。

     

    Abstract: The segment joints of shield tunnels represent critical weak points in the overall tunnel structure, with the failure of connecting bolts directly compromising the service performance. To investigate the influence of circumferential bolt failure of shield tunnel segments on the transverse seismic behavior of the sgment structure, this study establishes three-dimensional finite element models of both single- and double-lining configurations for a large crosssection shield tunnel project, employing implicit dynamic time-history analysis for seismic performance evaluation. Results demonstrate that circumferential bolt failure leads to increased transverse deformation and peak damage levels. While the application of a secondary lining enhances transverse deformation resistance and reduces peak damage, it concurrently expands the damage distribution zone. Under bolt failure conditions, the secondary lining improves the mechanical performance utilization of the segment reinforcement cages. For tunnel sections with potential bolt failure risks, the implementation of secondary linings is recommended to enhance seismic resilience.

     

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