Interaction between tunnel and unstable slope - Influence of time-dependent behavior of a tunnel excavation in a deep-seated gravitational slope deformation

Autor: Roger Cojean, Lionel Causse, Jean-Alain Fleurisson
Přispěvatelé: Centre de Géosciences (GEOSCIENCES), MINES ParisTech - École nationale supérieure des mines de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)
Jazyk: angličtina
Rok vydání: 2015
Předmět:
Engineering
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
Context (language use)
Astrophysics::Cosmology and Extragalactic Astrophysics
Instability
creep
damages
numerical simulations
Acceleration
[SPI.GCIV.IT]Engineering Sciences [physics]/Civil Engineering/Infrastructures de transport
parametric studies
Slope stability
Condensed Matter::Superconductivity
glacial retreat
[SPI.GCIV.RISQ]Engineering Sciences [physics]/Civil Engineering/Risques
Geotechnical engineering
Deformation (mechanics)
business.industry
[SPI.GCIV.GEOTECH]Engineering Sciences [physics]/Civil Engineering/Géotechnique
time-dependent behavior
Excavation
Building and Construction
Geotechnical Engineering and Engineering Geology
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
tunnels
Creep
business
Unstable slopes
Slope stability analysis
interaction tunnel-ground
Zdroj: Tunnelling and Underground Space Technology
Tunnelling and Underground Space Technology, Elsevier, 2015, pp.270-281
ISSN: 0886-7798
Popis: International audience; A back analysis of old tunnel in a unstable slope contect leads to consider several situations of tunnel entering a slope: cross-cutting tunnel to the slope, oblique tunnel to the slope, or shallow tunnel parallel to the slope. Identified pathologies of structures vary depending on these situations. In the context of a shallow tunnel, the tunnel excavation leads to a slope destabilization due to a more or less important deconfinement of the surrounding massif. Construction techniques influence, on one hand, slope surface displacement acceleration, on the other hand, structural damages in the tunnel lining. Nevertheless, the interaction between tunnel and unstable slope depends on the distance between the slope surface and the tunnel lining plot according to the tunnel diameter (D) and on the geological, geomorphological, hydrological and seismic contexts of the slope. This research focises on different mechanisms of slope instability in a glacial unloading context, especially in creeping contexts, and on damages affecting the structure of tunnels parallel to the slope. Through numerical simulations, the influence of construction techniques was studied; so was the choise of the tunnel situation, more or less away from the slope surface. Mainly the delay time before tunnel structure implementation on the damage lining process, the interaction between tunnel and slope surface displacements and their time evolution have been taken into account for the most critical tunnel situation in the slope. The different situations of the tunnel in the slope permit to set in evidence the safety distance from the slope in the context of a slow glacial unloading mechanism.
Databáze: OpenAIRE
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