Analysis and modelling of longitudinal deformation profiles of tunnels excavated in strain-softening time-dependent rock masses
Visualitza/Obre
10.1016/j.compgeo.2020.103643
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/346070
Tipus de documentArticle
Data publicació2020-09
EditorElsevier
Condicions d'accésAccés obert
Llevat que s'hi indiqui el contrari, els
continguts d'aquesta obra estan subjectes a la llicència de Creative Commons
:
Reconeixement-NoComercial-SenseObraDerivada 4.0 Internacional
Abstract
Rock mass behaviour model selection, in particular, to represent the post-failure behaviour and time-dependent behaviour of rock masses, are critical issues in the correct application of tunnelling design techniques such as the convergence-confinement method or numerical modelling. This study provides a general numerical approach for predicting longitudinal deformation profiles using a coupled ViscoElastic-ViscoPlastic Strain-Softening (VEVP-SS) model. A viscous dashpot and the strain-softening model are coupled to simulate the progressive damage process and creep failure behaviour of rock masses. Different failure criteria are considered to simulate the post-failure behaviour. As a verification step, numerical creep tests are carried out to analyse the coupled behaviour, and the basic viscoelastic and strain-softening results of the VEVP-SS model are compared with analytical solutions and numerical results. The proposed method is able to consider the coupling between post-failure behaviour and time-dependent behaviour, thus providing a new alternative method for preliminary tunnel design. Parametric analyses are then carried out to investigate the influence of different aspects on the longitudinal deformation profiles. The tunnel deformation based on the VEVP-SS model is larger than the corresponding elastic–plastic results due to the contribution of the creep behaviour, and the excavation rate becomes relevant when considering time-dependent behaviour.
CitacióSong, F. [et al.]. Analysis and modelling of longitudinal deformation profiles of tunnels excavated in strain-softening time-dependent rock masses. "Computers and geotechnics", Setembre 2020, vol. 125, p. 103643:1-103643:23.
ISSN0266-352X
Versió de l'editorhttps://www.sciencedirect.com/science/article/abs/pii/S0266352X20302068
Fitxers | Descripció | Mida | Format | Visualitza |
---|---|---|---|---|
postprint.pdf | 2,219Mb | Visualitza/Obre |