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Titolo:
In situ and laboratory investigations of fluid flow through an argillaceous formation at different scales of space and time, Tournemire tunnel, southern France
Autore:
Boisson, JY; Bertrand, L; Heitz, JF; Moreau-Le Golvan, Y;
Indirizzi:
CEA, IPSN, SERGD, CEN FaR, F-92265 Fontenay Aux Roses, France CEA Fontenay Aux Roses France F-92265 F-92265 Fontenay Aux Roses, France ANTEA BRGM Grp, F-45061 Orleans, France ANTEA BRGM Grp Orleans France F-45061 BRGM Grp, F-45061 Orleans, France Energy & Waste CREED VIVENDI Grp, Res Ctr Environm, F-780520 Limay, FranceEnergy & Waste CREED VIVENDI Grp Limay France F-780520 520 Limay, France
Titolo Testata:
HYDROGEOLOGY JOURNAL
fascicolo: 1, volume: 9, anno: 2001,
pagine: 108 - 123
SICI:
1431-2174(200102)9:1<108:ISALIO>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
PERMEABILITY; SHALE;
Keywords:
diffusion; hydraulic properties; hydraulic testing; laboratory experiments/measurements; confining units;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Boisson, JY CEA, IPSN, SERGD, CEN FaR, BP6, F-92265 Fontenay Aux Roses, France CEA BP6 Fontenay Aux Roses France F-92265 y Aux Roses, France
Citazione:
J.Y. Boisson et al., "In situ and laboratory investigations of fluid flow through an argillaceous formation at different scales of space and time, Tournemire tunnel, southern France", HYDROGEOL J, 9(1), 2001, pp. 108-123

Abstract

In the context of a research and development program on waste disposal, anexperimental site (Tournemire tunnel, Aveyron, France) was selected by theFrench Institute for Nuclear Protection and Safety (IPSN) in order to undertake studies on potential fluid flow at different scales of space and timewithin a 250-m-thick argillaceous formation. The argillite has a low natural water content (similar to3-5%) and very low radii access porosity. Diffusion (tritiated water) coefficients (1x10(-12) to 2x10(-11) m(2)/s) and hydraulic conductivities derived from different types of laboratory tests (10(-14) to 10(-13) m/s) are characteristics of a very low-permeable rock. In situ hydraulic tests (including long-term hydraulic-head measurements) were used to obtain values for hydraulic head and hydraulic conductivity at a scale of 1-10 m (10(-13) to 10(-11) m/s). Despite uncertainties on these data(due to a scale factor, presence of fissures, and possible artefacts due to hydro-chemo-mechanical coupling), it is expected that fluid flow is essentially governed by diffusion processes. Identification of possible natural flows at larger scales of time and space was investigated using natural isotopic tracers from interstitial fluids. Modelling, based on the deuterium profile along the clay formation and assuming pure diffusion processes, provides estimations of possible flow times. However, lack of knowledge concerning the past geological evolution of the site and the possible role of a fracture network do not permit reduction of uncertainties on these estimations at this stage.

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Documento generato il 29/03/20 alle ore 17:42:35