Abstract
Determination of the subsurface geology is very important for the rock quarry industry. This is primarily done by drilling and mapping. However, in Sweden, the bedrock is often completely covered by Quaternary sediments, making the prediction quite difficult. This study shows that electrical resistivity imaging together with induced polarization proved to be very efficient in detecting fracture frequency, major fracture zones and variations in rock mass quality, all of which can affect the aggregate quality. These techniques can also determine the thickness of the overburden. Furthermore, by doing 2D-parallel data sampling, a 3D inversion of the dataset is possible, which greatly enhances the visualization of the subsurface. Implementation of geophysics can be a valuable tool for the quarry industry, resulting in substantial economic benefits.
Résumé
Les études géologiques de sub-surface sont très importantes pour l’industrie des matériaux de carrière. Ces études sont principalement réalisées par forage et cartographie. Cependant, en Suède, le substratum est souvent complètement recouvert par des dépôts quaternaires, entraînant des prévisions très difficiles. Cette étude montre que les techniques associées d’imagerie de résistivité électrique et de polarisation induite s’avèrent être très efficaces pour la détection de densités de fractures, de zones fortement fracturées et de variations de la qualité du massif rocheux, tous ces éléments pouvant affecter la qualité des granulats. De plus, en réalisant des échantillonnages par des lignes parallèles à deux dimensions, une inversion tridimensionnelle du jeu de données est possible, ce qui améliore grandement la visualisation de la sub-surface. La mise en œuvre des méthodes géophysiques apparaît intéressante pour les industries extractives, avec en perspective des bénéfices économiques substantiels.
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Acknowledgments
The work behind this paper was funded by The Swedish Research Council for Environment, Agricultural Sciences, and Spatial Planning (Formas). Thanks to Björn Eliasson at Skanska Sverige AB, Asfalt och Betong Mellansverige; to Magnus Tillman at Hagéns Åkeri and to NCC Roads; and to Björn Linné at Sydsten, for allowing us to use the quarries as test sites.
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Magnusson, M.K., Fernlund, J.M.R. & Dahlin, T. Geoelectrical imaging in the interpretation of geological conditions affecting quarry operations. Bull Eng Geol Environ 69, 465–486 (2010). https://doi.org/10.1007/s10064-010-0286-y
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DOI: https://doi.org/10.1007/s10064-010-0286-y
Keywords
- Electrical resistivity imaging
- Rock mass quality
- Aggregate production
- Geophysical methods
- Induced polarization
- Normalized induced polarization