Abstract
The headrace tunnels 2 and 3 at the Vietas hydro power station, Swedish Lapland, penetrate the lower nappes of the Scandinavian Caledonides as well as the Precambrian basement. Various geological features have influenced the alignment and the excavation and also have partially determined the shape of the tunnels. High rock stress effects have occurred and stress measurements have been carried out in both tunnels. The relationshio between the geological structures and the state of stress indicates that the stress is of tectonic origin and that it has been induced by forces that are still active. Les galeries d'amenée 2 et 3 de l'usine hydroélectrique de Vietas en Laponie suédoise pénètrent dans les nappes basses des Calédonides scandinaves aussi bien que dans le socle précambrien. Différents facteurs géologiques ont influencé sur le tracé et le creusement et ont aussi en partie déterminé la forme des galeries. Des effets de contrainte des roches élevées ont été provoqués et des mesures de contrainte ont été effectuées dans les deux galeries. La relation entre les structures géologiques et l'état des contraintes indique que la contrainte est d'origine tectonique et qu'elle est due à des forces qui sont toujours actives.
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