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Beauregard dam: major rehabilitation works to guarantee its life extension

pubblicazioni - Memoria

Beauregard dam: major rehabilitation works to guarantee its life extension

Il lavoro presenta il caso della diga di Beauregard soggetta a una parziale demolizione (riduzione dell’altezza della diga di 50m) mediante esplosivi per garantirne la gestione in sicurezza nei prossimi decenni.

The Beauregard dam is a concrete arch-gravity structure 132m high built in the ”50 on the Dora di Valgrisenche River (Italy). The design reservoir volume was about 70Mm3.The geological and geotechnical investigations carried out since the dam construction and deepened in the last decades have underlined that a Deep-Seated Gravitational Slope Deformation (DSGSD) is located on the left slope. Since the first fillings of the reservoir, the interaction between the DSGSD and the dam was recognized to have relevant implications on the dam structural safety.

For that reason, the Italian Dam Authorities in 1969 prescribed a limitation of the reservoir level with a corresponding reduction of its volume to 6.8Mm3, about 1/10 of the initial design volume. The investigations, which include a detailed analysis and thorough interpretation of the monitoring data over a time span of more than 50 years, have allowed to gain insights into the understanding of the DSGSD behavior and its interaction with the dam.

The solution implemented to guarantee the long-term safety operation of the dam has foreseen the demolition of the upper part of the structure by blasting. The works have been completed at the end of 2015 and the dam is in operation.

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