Characterisation and engineering properties of tectonically undisturbed but lithologically varied sedimentary rock masses

Hoek, E; Marinos, PG; Marinos, VP

dc.contributor.author	Hoek, E	en
dc.contributor.author	Marinos, PG	en
dc.contributor.author	Marinos, VP	en
dc.date.accessioned	2014-03-01T01:21:59Z
dc.date.available	2014-03-01T01:21:59Z
dc.date.issued	2005	en
dc.identifier.issn	1365-1609	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16422
dc.subject	Air slaking	en
dc.subject	Brittle failure	en
dc.subject	GSI charts	en
dc.subject	Molasse	en
dc.subject	Sedimentary rocks	en
dc.subject	Tunnel design	en
dc.subject.classification	Engineering, Geological	en
dc.subject.classification	Mining & Mineral Processing	en
dc.subject.other	Erosion	en
dc.subject.other	Geotechnical engineering	en
dc.subject.other	Landforms	en
dc.subject.other	Lithology	en
dc.subject.other	Tectonics	en
dc.subject.other	Tunneling (excavation)	en
dc.subject.other	Conglomerates	en
dc.subject.other	Geological strength index (GSI)	en
dc.subject.other	Rock masses	en
dc.subject.other	Siltstones	en
dc.subject.other	Sedimentary rocks	en
dc.subject.other	geotechnical property	en
dc.subject.other	lithology	en
dc.subject.other	rock mass classification	en
dc.subject.other	rock mechanics	en
dc.subject.other	sedimentary rock	en
dc.title	Characterisation and engineering properties of tectonically undisturbed but lithologically varied sedimentary rock masses	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.ijrmms.2004.09.015	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.ijrmms.2004.09.015	en
heal.language	English	en
heal.publicationDate	2005	en
heal.abstract	Tectonically undisturbed sedimentary rocks deposited in a quiescent shallow marine environment often include a sequence of strata that may present significant lithological variety at the scale of an engineering structure. Such rock masses exhibit engineering properties that are significantly different from tectonically disturbed rock masses of similar composition. For example, molasse consists of a series of tectonically undisturbed sediments of sandstones, conglomerates, siltstones and marts, produced by the erosion of mountain ranges after the final phase of an orogeny. They behave quite differently from flysch which has the same composition but which was tectonically disturbed during the orogeny. The molasses behave as continuous rock masses when they are confined at depth and the bedding planes do not appear as clearly defined discontinuity surfaces. Close to the surface the layering of the formations is discernible and only then similarities may exist with the structure of some types of flysch. Therefore extreme care is necessary in the use of geotechnical classification systems for the selection of design parameters, in order to avoid penalizing the rock mass unnecessarily. A discussion on the use of the geological strength index (GSI) for the characterisation of such rock masses is presented. Two GSI charts are proposed for estimating the mechanical properties of these masses: one mainly for tunnels; and the second for surface excavations. An example is given to illustrate the process of tunnel design in molassic rocks. (C) 2004 Elsevier Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	International Journal of Rock Mechanics and Mining Sciences	en
dc.identifier.doi	10.1016/j.ijrmms.2004.09.015	en
dc.identifier.isi	ISI:000226949100008	en
dc.identifier.volume	42	en
dc.identifier.issue	2	en
dc.identifier.spage	277	en
dc.identifier.epage	285	en