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Anomalies of noble gases and self-potential associated with fractures and fluid dynamics in a horizontal borehole, Mont Terri Underground Rock Laboratory

hal.structure.identifierInstitut de Physique du Globe de Paris [IPGP]
dc.contributor.authorMAINEULT, A.
hal.structure.identifierRAEN
dc.contributor.authorTHOMAS, B.
dc.contributor.authorNUSSBAUM, C.
dc.contributor.authorWIECZOREK, K.
hal.structure.identifierInstitut de Physique du Globe de Paris [IPGP]
dc.contributor.authorGIBERT, D.
hal.structure.identifierRAEN
dc.contributor.authorLAVIELLE, B.
hal.structure.identifierGéosciences Rennes [GR]
dc.contributor.authorKERGOSIEN, B.
hal.structure.identifierGéosciences Rennes [GR]
dc.contributor.authorNICOLLIN, F.
dc.contributor.authorMAHIOUZ, K.
hal.structure.identifierInstitut de Physique du Globe de Paris [IPGP]
dc.contributor.authorLESPARRE, N.
dc.date.issued2013
dc.identifier.issn0013-7952
dc.description.abstractEnBefore the excavation of the new gallery Ga08 in the Mont Terri Underground Rock Laboratory (Switzerland), which joined the existing gallery Ga04 in 2008, the end-face of gallery Ga04 was instrumented in 2007 to characterize the evolution of the rock mass with geochemical and geophysical methods. The noble gas content of a 12-m long horizontal borehole evidenced that desaturation processes occurred in the first 2 m, where pre-existing fractures accommodated the stress change during excavation of gallery Ga04 four years before. These first 2 m are associated with the so-called Excavation Damaged Zone (EDZ). As an inflow of pore water was observed in this borehole few weeks after its drilling, continuous self-potential (SP) measurements were performed to characterize its dynamics. After the drilling of new sub-horizontal boreholes in the end-face, strong localized variations of SP occurred. The comparison with the geological features of the rock mass suggests that these dynamic anomalies have to be associated with fluid circulation in pre-existing tectonic fractures that were primarily reactivated by the excavation of the gallery Ga04 and subsequently by the drilling operations.
dc.language.isoen
dc.publisherElsevier
dc.subject.enMont Terri Underground Rock Laboratory
dc.subject.enExcavation Damaged Zone
dc.subject.enNoble gases
dc.subject.enSelf-potential
dc.subject.enOpalinus clay
dc.title.enAnomalies of noble gases and self-potential associated with fractures and fluid dynamics in a horizontal borehole, Mont Terri Underground Rock Laboratory
dc.typeArticle de revue
dc.identifier.doi10.1016/j.enggeo.2013.01.010
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Géochimie
dc.subject.halSciences de l'environnement/Milieux et Changements globaux
bordeaux.journalEngineering Geology
bordeaux.page46-57
bordeaux.volume156
bordeaux.peerReviewedoui
hal.identifierin2p3-00825385
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//in2p3-00825385v1
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