Viscoplasticité et endommagement des roches en application à la modélisation du comportement à long terme des ouvrages souterrains - Archive ouverte HAL Accéder directement au contenu
Hdr Année : 2004

Viscoplasticité et endommagement des roches en application à la modélisation du comportement à long terme des ouvrages souterrains

Résumé

The construction of civil works and in particular the excavation of underground cavities produces strain, which in most cases develops partly instantaneously and partly in a delayed manner. Consequently, rock damage and possible failure rarely occur instantaneously, but rather after a few hours or even years after the stress state has been modified as a result of building the structure. The first part of this report will therefore be devoted to experimental results, with a view to characterising the damageable viscoplastic behaviour of rocks. These involve mainly monotonic and cyclic creep, relaxation and quasi-static loading tests carried out in the laboratory and supplemented by observations of changes in rock microstructure. The second part describes a constitutive model designed to reproduce the observed phenomena, taking into account in particular volume variations associated with viscoplastic strain and anisotropic damage. The last part describes the numerical simulation of underground structure excavations, based on real, carefully instrumented cases. Particular emphasis is given to ways of simulating time-dependent changes in the damaged zone around underground storage cavities. To conclude, a number of prospective experimental and theoretical developments will be outlined.

Domaines

Génie civil
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Dates et versions

tel-01269649 , version 1 (05-02-2016)

Identifiants

  • HAL Id : tel-01269649 , version 1

Citer

Frederic Pellet. Viscoplasticité et endommagement des roches en application à la modélisation du comportement à long terme des ouvrages souterrains. Génie civil. Université Joseph Fourier, 2004. ⟨tel-01269649⟩

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