Structural Engineering and Mechanics

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Full-scale testing and modeling of the mechanical behavior of shield TBM tunnel joints

  • Ding, Wen-Qi (Department of Geotechnical Engineering, Tongji University) ;
  • Peng, Yi-Cheng (Department of Geotechnical Engineering, Tongji University) ;
  • Yan, Zhi-Guo (Department of Geotechnical Engineering, Tongji University) ;
  • Shen, Bi-Wei (Department of Geotechnical Engineering, Tongji University) ;
  • Zhu, He-Hua (Department of Geotechnical Engineering, Tongji University) ;
  • Wei, Xin-Xin (Department of Geotechnical Engineering, Tongji University)
  • Received : 2012.06.18
  • Accepted : 2012.12.15
  • Published : 2013.02.10
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Abstract

For shield TBM (Tunnel Boring Machine) tunnel lining, the segment joint is the most critical component for determining the mechanical response of the complete lining ring. To investigate the mechanical behavior of the segment joint in a water conveyance tunnel, which is different from the vehicle tunnel because of the external loads and the high internal water pressure during the tunnel's service life, full-scale joint tests were conducted. The main advantage of the joint tests over previous ones was the definiteness of the loads applied to the joints using a unique testing facility and the acquisition of the mechanical behavior of actual joints. Furthermore, based on the test results and the theoretical analysis, a mechanical model of segment joints has been proposed, which consists of all important influencing factors, including the elastic-plastic behavior of concrete, the pre-tightening force of the bolts and the deformations of all joint components, i.e., concrete blocks, bolts and cast iron panels. Finally, the proposed mechanical model of segment joints has been verified by the aforementioned full-scale joint tests.

Keywords

References

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