GEOLOGICAL CONTROLS ON INTACT ROCK STRENGTH. THE EFFECT OF ANISOTROPY

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Published: Jan 1, 2004
DOI: https://doi.org/10.12681/bgsg.16653
χ. Σαρόγλου
School of Civil Engineering, National Technical University of Athens
Π. Μαρίνος
School of Civil Engineering, National Technical University of Athens
Γ. Τσιαμπάος
School of Civil Engineering, National Technical University of Athens
Abstract

The factors that influence the strength and deformation of the intact rock are the mineral composition, the fabric, the grain size and the degree of alteration and weathering. Anisotropy is a characteristic of intact foliated metamorphic rocks (slates, gneisses, phyllites, schists). The current paper deals with the pronounced effect of the fabric of anisotropic rocks on the strength and deformation characteristics of intact rocks. It is part of ongoing research in the Department of Geotechnical Engineering, National Technical University of Athens. Testing was used to establish the anisotropic behaviour of selected metamorphic rocks. The effect of anisotropy on various mechanical properties (strength, deformation) and dynamic properties (wave velocity) was examined. The degree of strength anisotropy of these rocks can be indirectly estimated, by wave propagation through the rock, and thus they can be classified by means of geological and geotechnical indexes.

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  • Engineering Geology, Hydrogeology, Urban Geology
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References
Berry P., Crea G., Martino D. and Ribacchi R., 1974.The influence of fabric on the deformability of anisotropic rocks, Proc. of 3rd Int. Congr. Rock Mech., Denver, Vol. 2, 105-110pp.
Brodi, E., 1974.The influence of water on some rock properties. Advances in Rock Mechanics. Proc. of 3rd Int. Congr. Rock Mech., Denver, Vol. 2, Part A, 33-38pp.
Attewell P.B., 1970. Triaxial anisotropy of wave velocity and elastic moduli in slate and their axial concordance with fabric and tectonic symmetry. Int. Journal of Rock Mech. & Min. Sciences Vol. 7, 193-207pp.
Brosch F.J., Schachner Κ., Blumel M., Fasching Α. & Fritz Η., 2000. Preliminary investigation results on fabrics and related physical properties of an anisotropic gneiss. Journal of Structural Geology, vol. 22,1773-1787pp.
Donath F., 1964. Strength variation and Deformational behavior in anisotropic rock . In State of Stress in the Earth's Crust (W.R. Judd. Ed.), Elsevier, New York, 281-298pp.
Hoek. E., 1964. Fracture of anisotropic rock. Journal of the South African Institute of Mining and Metallurgy. May 1964, 501-518pp.
ISRM, 1981. Rock characterization, testing and monitoring, ISRM suggested methods. E.T.Brown (ed.), Oxford Pergamon Press.
Papadopoulos Z. & Marinos P., 1992. On the anisotropy of the Athenian Schist and its relation to weathering. Bull, of the I.A.E.G., Vol.45., 111-116pp.
Saroglou H., Marinos P., Tsiambaos G., 2003. The anisotropic nature of selected metamorphic rocks from Greece. 10th Int. Conf. of ISRM, Technology Roadmap for Rock Mechanics, South African Institute of Mining and Metallurgy, 2003, vol.1, 1019-1024pp.
Saroglou H., Marinos P., Tsiambaos G., 2003. Applicability of the Hoek-Brown Failure Criterion and the effect of the anisotropy on intact rock samples from Athens Schist. 10th Int. Conf. of ISRM, Technology Roadmap for Rock Mechanics, South African Institute of Mining and Metallurgy, 2003, vol.1, 1025-1030pp.
Youash Y.Y., 1966. Experimental deformation of layered rocks. Proc. of 1st Congr. Int. Soc. Rock. Mech., Lisbon. Vol.3, 787-795pp.
Σαμττατακάκης Ν., Τσιαμττάος Γ., 1983. Η επίδραση της ανισοτροττίας φυλλιτικού πετρώματος Κεντρικής Μακεδονίας στην αντοχή του σε μονοαξονική θλίψη, Δελτίο Κ.Ε.Δ.Ε./ Υ.ΠΕ.ΧΩ.Δ.Ε., 1-2, 26-33ρρ.
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