隧道工作面稳定性与滑移线网破坏模式研究

Translated title of the contribution: Stability and mesh-like collapse mechanism of tunnel face

Yan Jun Sun, Jun Sheng Yang, Jing Jing Luo, Xiang Cou Zheng, Feng Yang*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

The stability and collapse mechanism of tunnel faces are simplified conservatively to two-dimensional plane strain models along the longitudinal middle line of tunnel. Using the upper bound finite element method with rigid translatory moving element (UBFEM-RTME), a series of stability factors Ncr and collapse mechanisms displayed with active discontinuities are deduced. The influences of dimensionless buried depth ratio H/D, internal friction angle φ and dilatancy angle ψ on the variations of Ncr and mesh-like collapse mechanisms that are identical to the form of slip lines are discussed. A fitting formula of Ncr for the influence factors H/D and φ is deduced, and the effects of numbers and locations of active discontinuities are also investigated. This study illustrates that the UBFEM-RTME with combination of mesh adaptive updating strategies and reasonable and sufficient mesh density can improve the accuracy of the obtained Ncr values and the refinement of mesh-like collapse mechanism. The results reveal the main characteristics of the ultimate collapse mechanisms of tunnel faces, and they can provide theoretical supports for the stability evaluations of tunnel faces and pre-reinforcement scheme of soil strata.

Translated title of the contributionStability and mesh-like collapse mechanism of tunnel face
Original languageChinese
Pages (from-to)1374-1380
Number of pages7
JournalYantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering
Volume41
Issue number7
DOIs
Publication statusPublished - 2019

Keywords

  • Collapse mechanism
  • Dilatancy effect
  • Stability factor
  • Stability of tunnel face
  • Upper bound finite element method

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