Stability analysis of shotcrete supported crown of NATM tunnels with discontinuity layout optimization

authored by: Yiming Zhang, Xiaoying Zhuang, Roman Lackner
Abstract: For tunnel constructed by New Austrian Tunnelling Method, the crown is the upper part of tunnel section, constructed during excavation process and supported by shotcrete. The stability of the crown has great influence on the safety of tunnel itself and the buildings above, which correlates, among others, with geometrical setup of tunnel and material properties of shotcrete and soil/rock. In this paper, aiming at analyzing the stability of shotcrete supported crown, a recently presented numerical method discontinuity layout optimization is adopted, which introduces a great amount of potential discontinuities cross over one another and provides a wide search space for efficient upper limit analysis. In the analysis, a well-established hydration model of cementitious material is implemented for accounting the hydration of shotcrete. Then assumptions based on convergence-confinement method are used for accounting the 3-dimensional effect in 2-dimensional analysis, finally providing time-space–dependent assessments of stability of shotcrete supported crown.
Organisation(s): Institute of Continuum Mechanics
External Organisation(s): Hebei University of Technology
Tongji University
University of Innsbruck
State Key Laboratory for Disaster Reduction of Civil Engineering
Type: Article
Journal: International Journal for Numerical and Analytical Methods in Geomechanics
Volume: 42
Pages: 1199-1216
No. of pages: 18
ISSN: 0363-9061
Publication date: 02.07.2018
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Computational Mechanics, General Materials Science, Geotechnical Engineering and Engineering Geology, Mechanics of Materials
Electronic version(s): https://doi.org/10.1002/nag.2775 (Access: Closed)
: Details in the research portal "Research@Leibniz University"

BibTeX

@article{89920d22996247ab9519204c6dda8c98,
title = "Stability analysis of shotcrete supported crown of NATM tunnels with discontinuity layout optimization",
abstract = "For tunnel constructed by New Austrian Tunnelling Method, the crown is the upper part of tunnel section, constructed during excavation process and supported by shotcrete. The stability of the crown has great influence on the safety of tunnel itself and the buildings above, which correlates, among others, with geometrical setup of tunnel and material properties of shotcrete and soil/rock. In this paper, aiming at analyzing the stability of shotcrete supported crown, a recently presented numerical method discontinuity layout optimization is adopted, which introduces a great amount of potential discontinuities cross over one another and provides a wide search space for efficient upper limit analysis. In the analysis, a well-established hydration model of cementitious material is implemented for accounting the hydration of shotcrete. Then assumptions based on convergence-confinement method are used for accounting the 3-dimensional effect in 2-dimensional analysis, finally providing time-space–dependent assessments of stability of shotcrete supported crown.",
keywords = "discontinuity layout optimization (DLO), factor of safety, failure mechanism, Mohr-Coulomb failure criteria, stability analysis",
author = "Yiming Zhang and Xiaoying Zhuang and Roman Lackner",
note = "Publisher Copyright: Copyright {\textcopyright} 2018 John Wiley & Sons, Ltd. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.",
year = "2018",
month = jul,
day = "2",
doi = "10.1002/nag.2775",
language = "English",
volume = "42",
pages = "1199--1216",
journal = "International Journal for Numerical and Analytical Methods in Geomechanics",
issn = "0363-9061",
publisher = "John Wiley and Sons Ltd",
number = "11",
}