Applicability of the geological strength index (GSI) classification for very weak and sheared rock masses. The case of the Athens Schist Formation

Hoek, E; Marinos, P; Benissi, M

dc.contributor.author	Hoek, E	en
dc.contributor.author	Marinos, P	en
dc.contributor.author	Benissi, M	en
dc.date.accessioned	2014-03-01T01:13:35Z
dc.date.available	2014-03-01T01:13:35Z
dc.date.issued	1998	en
dc.identifier.issn	14359529	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12586
dc.subject	Deformability modulus	en
dc.subject	Rock mass classification	en
dc.subject	Rock mass structure	en
dc.subject	Sheared shales	en
dc.subject	Strength parameters	en
dc.subject	Weak rocks	en
dc.title	Applicability of the geological strength index (GSI) classification for very weak and sheared rock masses. The case of the Athens Schist Formation	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/s100640050031	en
heal.identifier.secondary	http://dx.doi.org/10.1007/s100640050031	en
heal.publicationDate	1998	en
heal.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.	en
heal.journalName	Bulletin of Engineering Geology and the Environment	en
dc.identifier.doi	10.1007/s100640050031	en
dc.identifier.volume	57	en
dc.identifier.issue	2	en
dc.identifier.spage	151	en
dc.identifier.epage	160	en