Tunnelling through varying soil conditions in north-west Greece

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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. en
heal.identifier.secondary http://dx.doi.org/10.1680/geng. 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.journalName Proceedings of the Institution of Civil Engineers: Geotechnical Engineering en
dc.identifier.doi 10.1680/geng. 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

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