Published: Jan 1, 2010
rock mass classification GSIweak rock mass flysch-molasse ophiolites gneiss
P. V Marinos
The paper deals with the geotechnical classification of weak and complex rock masses. The complexity of these geological material demands a more specialized research and geological characterization due to the special features of their rock mass types regarding both their structure and their lithological characteristics. The weak and complex rock masses under consideration, often heterogeneous and containing rocks of extremely low strength, have in most cases undergone highly tectonised disturbance resulting in the destruction of their initial structure, while weathering can be another particular feature. The geotechnical types and their characterization of rock masses that can be developed in flysch, molasse, brecciated limestone, ophiolites and disturbed or weathered gneiss are studied here. In order to describe these masses in a quantitative way and provide numerical values to engineering design, new or revised rock mass classification diagrams are introduced within the general concept of the GSI system, or specific projections inside the existing GSI diagram are proposed The fundamental source for this research was data from the design and construction of 62 tunnels of Egnatia Highway appropriately assessed, processed, correlated and associated with field work.
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  • Engineering Geology and Geotechnical Engineering
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Barton, N.R., Lien, R., Lunde, J., 1974. Engineering classification of rock masses for the design of
tunnel support. Rock Mechanics, 6(4), pp. 189-239.
Bieniawski, Z.T.,1973. Engineering classification of jointed rock masses. Trans South Afr. Inst. Civ.
Eng. 15, pp. 335-344.
Brown, E.T., 1981. Rock characterization, testing and monitoring—ISRM suggested methods. Pergamon,
Oxford, pp.171-183.
Hoek, E., Marinos, P. and Benissi, M., 1998. Applicability of the Geological Strength Index (GSI)
classification for very weak and sheared rock masses. The case of the Athens Schist Formation.
Bulletin of Engineering Geology and the Environment, 57(2), pp. 151-160.
Hoek, E., Carranza-Torres, C., Corkum, B., 2002. Hoek - Brown failure criterion - 2002 edition. In:
Bawden H.R.W., Curran, J., Telesnicki, M. (eds). Proceedings of NARMS-TAC 2002, Toronto,
pp. 267-273.
Hoek, E., Marinos, P., and Marinos, V., 2004. Characterization and engineering properties of tectonically
undisturbed but lithologically varied sedimentary rock masses. International Journal of
Rock Mechanics and Mining Sciences, 42(2), pp. 277-285.
Marinos, P., Hoek, E., 2000. GSI: a geologically friendly tool for rock mass strength estimation. In:
Proceedings of the GeoEng2000 at the international conference on geotechnical and geological
engineering, Melbourne, Technomic publishers, Lancaster, pp. 1422-1446.
Marinos, P., 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.
Marinos, P., Hoek, E., Marinos, V., 2005. Variability of the engineering properties of rock masses
quantified by the geological strength index: the case of ophiolites with special emphasis on tunnelling.
Bulletin of Engineering Geology and the Environment, 65(2), pp. 129-142.
Marinos P. V. (2007). “Geotechnical classification and engineering geological behaviour of weak and
complex rock masses in tunneling”, Doctoral thesis, School of Civil Engineering, Geotechnical
Engineering Department, National Technical University of Athens (NTUA), Athens, July (in
Stille, H., Palmstroem, A., 2003. Classification as a tool in rock engineering. Tunnelling and Underground
Space Technology, 18, pp. 331-345.
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