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

Xiangguo Wu, Chenhang Nie, Faqiang Qiu, Xuesen Zhang, Li Hong, Jong Sub Lee, Thomas H.K. Kang

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

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.

Original languageEnglish
Pages (from-to)69-79
Number of pages11
JournalComputers and Concrete
Volume29
Issue number2
DOIs
Publication statusPublished - 2022 Feb

Keywords

  • Normal fault displacement
  • Numerical analysis
  • Post-tensioned precast concrete
  • Prefabricated box utility tunnel
  • Structural response

ASJC Scopus subject areas

  • Computational Mechanics

Fingerprint

Dive into the research topics of 'Analysis of underground post-tensioned precast concrete box utility tunnel under normal fault displacement'. Together they form a unique fingerprint.

Cite this