Time-dependent tunnel deformations in homogeneous and heterogeneous weak rock formations

To investigate long-term, time-dependent tunnel deformations, this study employs a non-linear rheological model capable of considering the tertiary creep behaviour of the rock mass (Okubo and Fukui, 2006). A model parametric study is undertaken with a 3D numerical model encompassing a tunnel. The re...

Full description

Saved in:
Bibliographic Details
Published inComputers and geotechnics Vol. 92; pp. 186 - 200
Main Authors Sainoki, Atsushi, Tabata, Shingo, Mitri, Hani S., Fukuda, Daisuke, Kodama, Jun-ichi
Format Journal Article
LanguageEnglish
Published New York Elsevier Ltd 01.12.2017
Elsevier BV
Subjects
Creep (materials)
Deformation
Deformation mechanisms
Instability
Mathematical models
Numerical analysis
Rheological properties
Rock deformation
Solifluction
Stability
Studies
Tertiary
Tertiary creep
Three dimensional models
Time dependence
Time-dependent tunnel deformation
Tunnel construction
Tunnels
Weak rock
Weak rock formation
Time-dependent tunnel deformation
Numerical analysis
Weak rock formation
Tertiary creep
Online AccessGet full text

Cover

More Information
Summary:To investigate long-term, time-dependent tunnel deformations, this study employs a non-linear rheological model capable of considering the tertiary creep behaviour of the rock mass (Okubo and Fukui, 2006). A model parametric study is undertaken with a 3D numerical model encompassing a tunnel. The results show that the tunnel walls start to deform at an accelerating rate after a lapse of ten years. The results offer an explanation to previously reported tunnel instability cases. A 3D numerical model encompassing weak rock formation obliquely intersecting with the tunnel is then constructed. The analysis yields asymmetric wall deformation pattern, suggesting the need for optimizing rock supports.
ISSN:0266-352X
1873-7633
DOI:10.1016/j.compgeo.2017.08.008