Applicability of the geological strength index (GSI) classification for very weak and sheared rock masses. The case of the Athens Schist Formation |
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| Authors: | E. Hoek P. Marinos M. Benissi |
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| Affiliation: | (1) 3034 Edgemont Boulevard, P.O. Box 75516, North Vancouver, British Columbia, Canada, V7R 4X1 Fax: +1 604 980 3512, e-mail: ehoek@ibm.net, CA;(2) National Technical University of Athens, 42 Patission Street, 10682 Athens, Greece Fax: +301-924 2570, e-mail: marinos@central.ntua.gr, GR;(3) ATTIKO METRO S.A., 191-193 Messogion Ave., 11525 Athens, Greece Fax: +301 672 6057, e-mail: mnovack@ametro.gr, GR |
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| Abstract: | The Athens Schist Formation includes a wide variety of metasedimentary rocks, varying from strong or medium strong rocks such as sericite metasandstone, limestone, greywacke, sericite schist through to weak rocks such as metasiltstone, clayey and silty shale and phyllite. The overall rock mass is highly heterogeneous and anisotropic owing to the combined effect of advanced weathering and severe tectonic stressing that gave rise to intense folding and shearing followed by extensional faulting, which resulted in highly weathered rock masses and numerous shear and/or mylonite zones with distinct downgraded engineering properties. This paper is focused on the applicability of the GSI classification system to these highly heterogeneous rock masses and proposes an extension of the GSI system to account for the foliated or laminated weak rocks in the lower range of its applicability. Received: 5 March 1998 · Accepted: 13 July 1998 |
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| Keywords: | Rock mass classification Weak rocks Strength parameters Deformability modulus Rock mass structure Sheared shales |
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