THE USE OF GEOLOGICAL STRENGTH INDEX GSI. RECOMMENDATIONS, LIMITATIONS AND RANGES OF VALUES IN MOST COMMON ROCK TYPES

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Published: Jan 1, 2004
DOI: https://doi.org/10.12681/bgsg.16636
Β. Μαρίνος
National Technical University of Athens, School of Civil Engineering, Geotechnical Department
Π. Μαρίνος
National Technical University of Athens, School of Civil Engineering, Geotechnical Department
E. Hoek
Abstract
After one decade of application of the Geological Strength Index, GSI, and its extensions, in the quantitative characterisation of the rock mass, the present paper attempts to answer the questions that have been raised by the users about the determination of the GSI for various qualities of rock masses and various conditions. Recommendations are given and cases are discussed where GSI is not applicable. The paper also gives general guidance on the field of GSI values of rock masses for the most common rock types based on their pétrographie and their most usual structural characteristics.
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  • Engineering Geology, Hydrogeology, Urban Geology
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References
Hoek, Ε., Wood, D., and Shah, S., 1992. A modified Hoek-Brown criterion for jointed rock masses, Proc. Rock Mech. Symp. Int. Soc. RockMech.: Eurock '92, (ed. J.A. Hudson), 209-214. London, Brit. Geotech. Soc.
Hoek, E., Marinos, P., and Benissi, M., 1998. Applicability of the Geological Strength Index (GSI) classification for weak and sheared rock masses - The case of the Athens Schist formation. Bulletin of Eng. Geol. Env. 57,2, 151-160.
Hoek, E., Marinos, P., and Marinos, V., 2004. Characteristics and engineering properties of tectonically undisturbed but lithologically varied sedimentary rock masses, (to be published)
Marinos, P.G., Hoek, E., 2000. GSI: A geologically friendly tool for rock mass strength estimation. Proceeding of GeoEng2000 at the International Conference on Geotechnical and Geological Engineering, Melbourne, pp. 1422-1446, Technomic Publishers, Lancaster, Pennsylvania.
Marinos, P.G., Hoek, E., 2001. Estimating the geotechnical properties of heterogeneous rock masses such as Flysch. Bulletin of Engineering Geology and the Environment, 60, pp.82-92.
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