Numerical evaluation of segmental tunnel lining with voids in outside backfill

Jia Xuan Zhang, Ning Zhang, Annan Zhou, Shui Long Shen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

14 Citations (Scopus)

Abstract

This paper presents a numerical investigation of the mechanical behaviour of segmental linings owing to the existence of voids in the composite lining. The composite lining was formed by mining outside and shield tunnelling inside with backfill in between. Finite element method was conducted to analyse the axial forces and bending moment for voids of different diameters at different positions. The results show that the axial forces in the transverse section increase near the crown and then invert and decrease on the left and right sides with an increase in the void centre angle (β) measured from the vertical axis. The increase in void diameter (d < 300 mm) induces an increase in the axial force on the left and right sides when β = 45° and 90°, while it decreases near the crown and invert. The occurrence of voids leads to an increase in the bending moment in the entire segment section with an angle β.

Original languageEnglish
Pages (from-to)786-797
Number of pages12
JournalUnderground Space (China)
Volume7
Issue number5
DOIs
Publication statusPublished - Oct 2022
Externally publishedYes

Keywords

  • Axial force
  • Bending moment
  • Composite lining
  • Jointly constructed tunnel
  • Voids

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

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