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  • Jeudi 8 juin 14:00-15:00 - Ricardo Neves Correia Dos Santos - Laboratorio Nacional de Engenharia Civil (LNEC), Lisboa, Portugal

    Experimental investigation on limitation of the progression of internal erosion in zoned dams

    Résumé : Water-retaining structures are built for a broad variety of purposes, including flood control, irrigation, water supply and hydroelectric generation. However, these structures may have inherent risks that should not be disregarded. The dam failure is typically of low likelihood, but can be of high consequences, with a potential for life loss in addition to substantial economic losses and environmental damages, and social and political disruption. In the study being presented, two mechanisms limiting the progression of internal erosion in zoned dams, potentiated by the presence of materials located upstream of a damaged core are investigated. These are the flow restriction and crack filling actions. The former is related with the ability of the upstream soil restricting the flows passing through a flaw in the core. The latter involves transport of particles from the upstream zone into a flaw in the core, up to a downstream granular zone. A new apparatus is developed from scratch. It allows carrying out two innovative laboratory tests : the Flow Limitation Erosion Test and the Crack Filling Erosion Test. The apparatus can assess whether erosion in the core stops, slows down, or progresses. The flow restriction action is governed by grading, plasticity and compaction characteristics of the upstream soil. Rules for preliminary estimation of the likelihood of occurrence of the studied actions are also proposed.

    Lieu : Amphithéâtre du site Prony

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