Coupled solid-fluid response of deep tunnels excavated in saturated rock masses with a time-dependent plastic behaviour
| Autor: | Sebastià Olivella, Alfonso Rodriguez-Dono, Antonio Gens, Fei Song |
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| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, Universitat Politècnica de Catalunya. MSR - Mecànica del Sòls i de les Roques |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Code (set theory)
Viscoplasticity Underground excavation Applied Mathematics Numerical analysis Hydro-mechanical modelling Post failure Viscoelasticity Mechanics CODE_BRIGHT Modeling and Simulation Post-failure Enginyeria civil::Geotècnia::Mecànica de roques [Àrees temàtiques de la UPC] Mecànica de roques -- Models matemàtics Enginyeria civil::Geotècnia::Túnels i excavacions [Àrees temàtiques de la UPC] Rock mechanics--Mathematical models Geology |
| Zdroj: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | This article provides a general numerical approach for modelling the response of deep tunnels excavated in saturated time-dependent plastic rock masses, considering a coupled solid-fluid interaction and time-dependent plastic behaviour. In order to do that, a Burgers-viscoplastic strain-softening model has been developed and implemented into the finite element method software CODE_BRIGHT, and a coupled solid-fluid model is used to simulate the interaction between solid deformations and fluid flow. Parametric analyses are then performed to analyse the influence on the tunnelling response of different time-dependent models, different standstill times and different excavation rates. It has been observed that the time-dependent model selection is crucial to simulate the response of underground excavations. Additionally, the coupled solid-fluid results are significantly different from the purely mechanical ones. The liquid pressure build-up in the vicinity of the tunnel face and the overpressure dissipation with time due consolidation can be accounted for. Moreover, the higher the excavation rate, the larger build-up of liquid pressures occurs. This research was supported by the CODE_BRIGHT Project (International Centre for Numerical Methods in Engineering). The first author was supported by a CSC scholarship (No. 201706260240). |
| Databáze: | OpenAIRE |
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