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The variation of bedrock quality with increasing ductile deformation

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Abstract

Most of the rocks in Precambrian shield areas have experienced a complex structural and metamorphic evolution, processes which have a strong influence on the bedrock quality. This may vary both on a local and regional scale. The main object of this investigation was to study the variation of the rock mechanical properties at various stages of ductile deformation of an originally isotropic rock. Ten samples from five different localities northeast of Lake Vänern (south central Sweden) were tested, including studded tyre and LA tests, uniaxial compressive strength (UCS), ultrasonic velocity, electrical resistivity, Swedish impact value and Swedish flakiness index as well as petrographic and chemical analyses. This study highlights the importance of considering all possible variations in bedrock before classification, and of undertaking regional investigations.

Résumé

Dans les régions du bouclier précambrien, la plupart des roches ont connu une évolution structurale et métamorphique complexe, ce qui a une forte influence sur la qualité du bedrock. Celle-ci peut varier à la fois à l’échelle locale et à l’échelle régionale. Le principal objectif de la recherche a été d’étudier la variation des propriétés mécaniques d’une roche initialement isotrope à différents stades de déformation ductile. Dix échantillons de cinq lieux différents au nord-est du lac Vänern (au centre-sud de la Suède) ont été soumis à des essais, dont l’essai de résistance à l’abrasion provoquée par les pneus à crampons, l’essai Los Angeles, la résistance à la compression uniaxiale, la vitesse des ultrasons, la résistivité électrique, l’essai suédois de résistance à la fragmentation par impact et le coefficient d’aplatissement suédois, mais aussi des analyses pétrographiques et chimiques. L’étude met en évidence l’importance qu’il y a à prendre en considération toutes les variations possibles dans le bedrock avant d’établir une classification et de procéder à des recherches régionales.

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Acknowledgements

The financial support provided by the Geological Survey of Sweden (SGU) is greatly acknowledged. Jan-Erik Lindqvist read an early draft of the manuscript and provided valuable comments. Sven Lundqvist is thanked for assistance with the microscopic work, and Barbara Rosborg for correcting the English.

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Authors and Affiliations

  1. Geological Survey of Sweden, Box 670, 751 28, Uppsala, Sweden

    Mattias Göransson, Lars Persson & Carl-Henric Wahlgren

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  1. Mattias Göransson
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  2. Lars Persson
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  3. Carl-Henric Wahlgren
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Correspondence to Mattias Göransson.

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Göransson, M., Persson, L. & Wahlgren, CH. The variation of bedrock quality with increasing ductile deformation. Bull Eng Geol Environ 63, 337–344 (2004). https://doi.org/10.1007/s10064-004-0248-3

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  • DOI: https://doi.org/10.1007/s10064-004-0248-3

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