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Les fondations au rocher de grands viaducs : l'apport de la méthode des éléments distincts

Abstract : The rock foundation design is not as well known as the soil foundation design. It has not been such a problem until today, as the foundation design was limited by the strength of concrete more than rock mass. But larger and larger structures are being built, that appoint for more investigations in this field of rock mechanics. The first part of this work includes a catalogue of the different methods adapted to determine the deformability and resistance of a rock mass. It also presents the methods to design rock foundations. It eventually analyses the French designing norms and standards and the ones of the English-speaking countries. It turns out that few rock foundation design methods exist, which take into account the rock mass joints. The case of foundations submitted to lateral loads and to overturning moments is not thoroughly studied. The second part consists of the numerical analysis of rock foundations with the distinct element code UDEC on a flat surface or on a slope. The results show that the rock joints influence greatly the behavior of deep foundations under inclined loads. According to their dip, the joints may diminish considerably the limit lateral load. Some analytical models with few blocks are then proposed, in order to estimate - for a preliminary design - the limit lateral failure load of a pier foundation. The numerical results obtained are two dimensional, the three dimensional results can be estimated by 2D/3D transposition factors. It would be interesting to verify these factors with a three dimensional distinct element code. The results of the numerical modelization should be checked on a real test site.
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Xavier Rachez. Les fondations au rocher de grands viaducs : l'apport de la méthode des éléments distincts. Mécanique [physics.med-ph]. Ecole Nationale des Ponts et Chaussées, 1997. Français. ⟨tel-00529379⟩

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