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Stabilité à long terme des talus de mines à ciel ouvert dans les massifs de roches basiques et ultrabasiques

Abstract : The present work is devoted to the weathering of basic and ultrabasic rocks under various climatic conditions and to the influence of such processes on the long term slope stability in open-pits. The rocks belong to old weathering profiles and, when outcropping by exploitation, are submitted to meteoric weathering which modify their petrographic and geotechnical parameters, at both the rock matrix and the rock mass scale. During this work, two sites were investigated: the chromite mine of Bemanevika (Madagascar), where the ultrabasites and the meta-ultrabasites are intensively weathered under tropical climatic conditions, and the asbestos mine of Bagenovskoe (Central Oural, Russia), where the same kind of rocks are exposed to weathering under tempered continental conditions. The long term forecasting of slope stability, taking into account the weathering development, was analysed in both cases. We also implemented laboratory simulations of the weathering of various rocks and rock sensitivity to weathering. Two kind of simulations were conducted: physical weathering by intensive frost/thaw cycles, and chemical weathering by leaching cycles in hot water using Soxhlet extractors. The data analysis and the comparison made between laboratory and in situ results allow to quantify the weathering process and, at least, to give an outline of long term development of instabilities in several rock masses, under various climatic conditions.
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  • HAL Id : tel-00529344, version 1

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Evgueni Porokhovoï. Stabilité à long terme des talus de mines à ciel ouvert dans les massifs de roches basiques et ultrabasiques. Géologie appliquée. Ecole Nationale des Ponts et Chaussées, 1995. Français. ⟨tel-00529344⟩

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