Tunnelling through varying soil conditions in north-west Greece

Georgiannou, VN

dc.contributor.author	Georgiannou, VN	en
dc.date.accessioned	2014-03-01T01:19:40Z
dc.date.available	2014-03-01T01:19:40Z
dc.date.issued	2003	en
dc.identifier.issn	1353-2618	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/15645
dc.subject	Geology	en
dc.subject	Geotechnical engineering	en
dc.subject	Tunnels and tunnelling	en
dc.subject.classification	Engineering, Geological	en
dc.subject.classification	Geosciences, Multidisciplinary	en
dc.subject.other	Clay	en
dc.subject.other	Sediments	en
dc.subject.other	Tunneling (excavation)	en
dc.subject.other	Tunnels	en
dc.subject.other	Sheared sediments	en
dc.subject.other	Civil engineering	en
dc.subject.other	fold and thrust belt	en
dc.subject.other	ground conditions	en
dc.subject.other	road construction	en
dc.subject.other	slope stability	en
dc.subject.other	support	en
dc.subject.other	tectonic setting	en
dc.subject.other	tunneling	en
dc.subject.other	Greece	en
dc.title	Tunnelling through varying soil conditions in north-west Greece	en
heal.type	journalArticle	en
heal.identifier.primary	10.1680/geng.156.2.97.37523	en
heal.identifier.secondary	http://dx.doi.org/10.1680/geng.156.2.97.37523	en
heal.language	English	en
heal.publicationDate	2003	en
heal.abstract	Tunnel S2 of the Egnatia Motorway is excavated through heavily fractured limestone and sheared sediments. Originally a fold and thrust belt was formed in the Alpine orogenic phase. Post-orogenic tectonics resulted in heavy fragmentation. The underlying material consists of clays and clayey sandy gravels. The basement of the clastic formation consists of evaporites. This variety of geological conditions resulted in considerable variability of tunnelling conditions and the need for extensive primary support measures. Owing to the mixed and rapidly changing geological conditions the type and intensity of primary support measures were selected according to geomechanical conditions at the crown. Slope stability problems were encountered during the excavation of the entrance portal, and because of the associated risk an additional study has been carried out to determine appropriate soil parameters for the excavation works through such a medium. Oedometer tests and direct shear tests were carried out to investigate the susceptibility of the material to structural breakdown and to define peak and post-rupture strength characteristics.	en
heal.publisher	THOMAS TELFORD SERVICES LTD	en
heal.journalName	Proceedings of the Institution of Civil Engineers: Geotechnical Engineering	en
dc.identifier.doi	10.1680/geng.156.2.97.37523	en
dc.identifier.isi	ISI:000183113400005	en
dc.identifier.volume	156	en
dc.identifier.issue	2	en
dc.identifier.spage	97	en
dc.identifier.epage	104	en