Abstract
The paper presents the results of different methods of determining the roughness of joints in quartzites, metagreywackes and phyllites obtained from road cuts in central Portugal. The evaluation of the joint roughness coefficient (JRC) was carried out using graphical and analytical procedures. Differences were found between the JRC graphic and the JRC calculated, depending on the method used. The JRC calculated values obtained by the tilt tests and the Schmidt rebound hammer tests were compared to the JRC calculated values established from the rock joint shear tests. It is concluded that if JRC is to be used, it is essential to specify how it was established.
Résumé
Cet article présente les résultats de différentes méthodes de déterminer la rugosité des discontinuités trouvées dans des quartzites, métagrauwackes et schistes obtenus dans des talus des routes au centre de Portugal. L’évaluation du Coefficient de Rugosité du Joint Joint Roughness Coefficient (JRC) a été réalisée à travers des procédures analytiques et graphiques. Des différences entre le JRC graphique et le JRC calculé sont trouvées selon les méthodes employées. Les valeurs du JRC obtenues par les essais d’inclinaison (tilt tests) et les essais de dureté par marteau de Schmidt ont été comparées aux valeurs du JRC calculées à partir des essais de cisaillement des discontinuités. On conclu qu’il est fondamental d’indiquer comment le JRC a été établit.
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Andrade, P.S., Saraiva, A.A. Estimating the joint roughness coefficient of discontinuities found in metamorphic rocks. Bull Eng Geol Environ 67, 425–434 (2008). https://doi.org/10.1007/s10064-008-0151-4
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DOI: https://doi.org/10.1007/s10064-008-0151-4
Keywords
- Joint Roughness Coefficient
- Discontinuities characteristics
- Tilt tests
- Rock joint shear tests
- Amplitude roughness
- Metamorphic rocks