Stabilité des massifs rocheux : une approche mécanique

Abstract : In order to protect societies against rockfalls, one mean consists in predicting those efficiently. Because rock joints play a great role in such phenomena, describing as good as possible their mechanical behaviour, especially their rupture, is therefore required. Thus, a new constitutive relation of rock joint, incrementally non linear, is presented, with the “second order work criterion”, used to detect conditions trigerring rockfalls. The definition of the relation relies on a numerical model of rock joint, based on the Discrete Element Method, via the code Yade. Once the behaviour of rock joint is investigated thanks to this numerical model (with some experimental comparisons), the relation is defined then validated. It is also studied in the second order work criterion framework. The existence of “unstable (loading) directions” is shown ; these directions can lead to failure before Mohr-Coulomb criterion. They depend especially on the existing couplings between the normal and tangential directions of the rock joint. An existing cliff is finally studied : the “Gorges de Valabres”, located in south of France. It is simulated with a discrete numerical model, which uses the new rock joint constitutive relation and is considered through the second order work criterion. Hence, it is observed that simulated loading corresponds to unstable directions for some rock joints.
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Submitted on : Monday, March 8, 2010 - 2:46:01 PM
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Jérôme Duriez. Stabilité des massifs rocheux : une approche mécanique. Autre. Institut National Polytechnique de Grenoble - INPG, 2009. Français. ⟨tel-00462072⟩

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