隧道工作面稳定性与滑移线网破坏模式研究

Journal article (2019)

Authors

Jun Sun Central South University China, Hunan Expressway Construction and Development Co.
Jun Sheng Yang Ministry of Education Hangzhou, Central South University China
Jing Luo Central South University China
X. Zheng Geo-engineering - CEG
Feng Yang Ministry of Education Hangzhou, Central South University China
Research Group
Geo-engineering (CEG) (TU Delft)
Collapse mechanism Dilatancy effect Stability factor Stability of tunnel face Upper bound finite element method
More Info
expand_more

Published Date

2019

Language

Chinese

Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Faculty

Civil Engineering & Geosciences

Department

Geoscience and Engineering

Research Group

Geo-engineering

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.