Computers and Concrete

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Analysis of underground post-tensioned precast concrete box utility tunnel under normal fault displacement

  • Wu, Xiangguo (College of Civil Engineering, Fuzhou University) ;
  • Nie, Chenhang (School of Civil Engineering, Harbin Institute of Technology) ;
  • Qiu, Faqiang (JianYan Test Group Co., Ltd.) ;
  • Zhang, Xuesen (CGN New Holdings Co., Ltd.) ;
  • Hong, Li (School of Energy and Architecture Engineering, Harbin University of Commerce) ;
  • Lee, Jong-Sub (Department of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Kang, Thomas H.K. (Department of Architecture and Architectural Engineering, Seoul National University)
  • Received : 2021.09.13
  • Accepted : 2022.01.26
  • Published : 2022.02.25
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Abstract

For long underground box utility tunnels, post-tensioned precast concrete is often used. Between precast tunnel segments, sealed waterproof flexible joints are often specified. Fault displacement can lead to excessive deformation of the joints, which can lead to reduction in waterproofing due to diminished contact pressure between the sealant strip and the tunnel segment. This paper authenticates utilization of a finite element model for a prefabricated tunnel fault-crossing founded on ABAQUS software. In addition, material parameter selection, contact setting and boundary condition are reviewed. Analyzed under normal fault action are: the influence of fault displacement; buried depth; soil friction coefficient, and angle of crossing at the fault plane. In addition, distribution characteristics of the utility tunnel structure for vertical and longitudinal/horizontal relative displacement at segmented interface for the top and bottom slab are analyzed. It is found that the effect of increase in fault displacement on the splice joint deformation is significant, whereas the effects of changes in burial depth, pipe-soil friction coefficient and fault-crossing angle on the overall tunnel and joint deformations were not so significant.

Keywords

Acknowledgement

This work was supported by the National Natural Science Foundation of China (grant number 51878222), the Xiamen Construction Science and Technology plan project (grant number XJK2020-1-9), and the National Research Foundation of Korea (grant number NRF-2021R1A5A1032433).

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