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Siting a rock cavern complex by means of 3-D fracture structure of a granite block

Choix de l'emplacement de cavités par l'étude tridimensionnelle de la fracturation d'un massif granitique

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Abstract

In order to determine the most suitable location for a complex of rock caverns, the fracturing of a rapakivi granite block was studied in three dimensions. Five vertical, 200 m deep boreholes (Ø=66 mm) were drilled for this purpose.

The selection of the geophysical measurements, which are utilized for this fracture classification is based on the results of the previous geophysical investigations in the test holes.

The connections between the boreholes are evaluated from dipmeter data, crosshole-seismic data and from charged potential cross-correlation data. The hydraulic conductivities of fracture zones and rock-blocks between them and the fracture apertures are calculated from water injection test data.

Résumé

Pour choisir l'emplacement le mieux adapté à l'implantation de cavités souterraines, l'étude tridimensionnelle de la fracturation d'un granite de Rapakivi a été entreprise. Cinq sondages verticaux d'une profondeur de 200 mètres (diamètre: 66 mm) on été réalisés dans ce but.

Le choix des mesures géophysiques utilisées est fondé sur des recherches préliminaires réalisées dans des forages d'essai.

Les corrélations entre forages sont faites au travers des données inclinométriques, des mesures sismiques entre forages et

La conductivité hydraulique des zones fracturées et des blocs rocheux, ainsi que l'ouverture des fractures sont calculées à partir des résultats des essais d'injection d'eau.

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  1. Technical Research Centre of Finland/Geotechnical Laboratory, Lämpömiehenkuja 2 B, SF-02150, Espoo 15, Finland

    Pirhonen V. O.

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  1. Pirhonen V. O.
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Pirhonen, V.O. Siting a rock cavern complex by means of 3-D fracture structure of a granite block. Bulletin of the International Association of Engineering Geology 34, 67–72 (1986). https://doi.org/10.1007/BF02590237

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  • DOI: https://doi.org/10.1007/BF02590237

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