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Prise en compte des non-linéarités de comportement des sols et des roches dans la modélisation du creusement d'un tunnel

Abstract : This thesis relates to the analysis of the behavior of civil engineering structures, from the point of view of both, the non-linear behaviour of soils and rocks and the resolution of tunnel excavation problems by means of the finite element method. Two categories of constitutive laws have been considered with particular attention to account for the non-linear behavior of the ground : hyperbolic models (Duncan and Chang, 1970 , modified Hardin and Drnevich, 1972) and elastoplastic models with strain hardening rules (modified Cam-Clay model, 1968); in latter case, different assumptions have considered to accounts for the non-linear response with the elastic range of deformation, including hyperelastic models which are derived from a complimental energy function and comply with the thermodynamics principals. These models have been applied to the simulation of a circular tunnel excavated in homogenous ground. The alternatives of the modified Cam-Clay model give, in case of anisotropic initial stresses, to compressive zones in springline and extensive zones in vault inside of rock mass. Stress paths analysis of the ground response around of the tunnel emphasise the influence of the initial stress state on failure mechanisms induced by ground excavation. The models have been also used to model the construction of Las Planas South tunnel, which was excavated in marls. The behaviour of the Las Planas marls has been studied from triaxial tests under high compressive stresses (isotropic and shear tests). The hyperelastic alternatives of the modified Cam-Clay model and the Duncan and Chang (1970) model lead to satisfactory results for most of the triaxial shear tests. On the other hand, the linear elastic alternative of the modified Cam-Clay model systematically overestimates the volumetric strains, generated during the tests. The numerical analysis of the construction of the Las Planas South tunnel, using the hyperelastic alternative of the modified Cam-Clay model is found to the best displacements observed from extensometer measurements, whereas the hyperbolic models tend to overestimate the displacements, induced by excavation in the rock mass.
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Submitted on : Friday, February 25, 2011 - 9:21:04 AM
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Yu-Lin Lee. Prise en compte des non-linéarités de comportement des sols et des roches dans la modélisation du creusement d'un tunnel. Géologie appliquée. Ecole Nationale des Ponts et Chaussées, 1994. Français. ⟨pastel-00569423⟩

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