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Mapping of joints in Pre-cambrian granitic rock masses

Relevé des fissures dans une roche granitique Précambrienne

  • IAEG Symposium “Engineering Geological Mapping for Planning, Disign and Construction in Civil Engineering”, Newcastle Upon Tyne, 3–6 September 1979
  • THEME 3 Civil Engineering Site Mapping Practice General Report Contributions
  • Published:
Bulletin of the International Association of Engineering Geology - Bulletin de l'Association Internationale de Géologie de l'Ingénieur Aims and scope Submit manuscript

Summary

The joints on the wall of a 665 m long unlined access tunnel to a cavern system were mapped along a horizontal scan line. Several outcrops close to the tunnel were mapped in the same manner.

The data were analysed plotting the joint directions on equal area stereographic plots. The mean joint directions were determined from the plots. The results obtained from the tunnel and from the outcrops are very similar and in good agreement with the impression the geologists got during the construction of the cavern system.

The joint distances were analysed by drawing histograms of all the joints measured in the access tunnel and on the outcrops. Curves of Weibull distribution were fitted to the histograms.

When the joints were grouped according to the joint directions it was possible to calculate the true mean joint distances of the different joint sets based on the mapping along a straight horizontal scan line.

Résumé

Le relevé des fissures a été fait en mesurant les directions des fissures du rocher dans la paroi d'un tunnel d'une longueur de 665 mètres, tunnel non revétu conduisant à un entrepôt creusé dans le roc. Dans les parties découvertes du rocher, au-dessus du tunnel, le relevé a été fait de la même façon.

Les résultats ont été traités en dessinant la direction des fissures en projection stéréographique où la surface est exacte. Sur la base des dessins, on a déterminé les directions moyennes des fissures. En comparant les résultats obtenus dans le tunnel et dans les parties découvertes, on a pu constater qu'ils donnaient de la fissuration du rocher une image semblable à celle qu'avaient obtenue les géologues lors de la construction de l'entrepôt.

Les intervalles entre les fissures ont été analysés en dessinant les histogrammes pour toutes les fissures mesurées dans le tunnel et dans les parties découvertes. On a appliqué aux histogrammes les courbes de distribution de Weibull.

Les fissures ont été groupées selon leurs directions principales et il a été possible de calculer les véritables intervalles moyens entre les fissures. On a ainsi pu définir la taille moyenne des blocs de rocher sur la base du relevé horizontal effectué.

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Authors and Affiliations

  1. Geotechnical Laboratory, Technical Research Centre of Finland, Finland

    Saari K. & Ylinen A.

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  1. Saari K.
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  2. Ylinen A.
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Saari, K., Ylinen, A. Mapping of joints in Pre-cambrian granitic rock masses. Bulletin of the International Association of Engineering Geology 19, 190–195 (1979). https://doi.org/10.1007/BF02600474

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  • DOI: https://doi.org/10.1007/BF02600474

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