Desaturation and structure relationships around drifts excavated in the well-compacted Tournemire's argillite (Aveyron, France)

Matray, Jean-Michel; Savoye, S.; Cabrera, Justo

doi:10.1016/j.enggeo.2006.09.021

Cited by 103 publications

(57 citation statements)

References 11 publications

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“…The excavation when building a repository causes physical damage (the excavation damage zone, or EDZ), desaturation and partial oxidation of the surrounding claystone. Such damage affects both the rock structure and its hydromechanical behaviour (Matray et al, 2007;Charlier et al, 2013), as well as its transport properties by diffusion (Savoye et al, 2010).…”

Section: Geochemistry Of the Callovian-oxfordian Formation In The Conmentioning

confidence: 99%

Equilibrium partial pressure of CO2 in Callovian–Oxfordian argillite as a function of relative humidity: Experiments and modelling

Lassin

Marty

Gailhanou

et al. 2016

Geochimica et Cosmochimica Acta

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, et al.. Equilibrium partial pressure of CO 2 in Callovian-Oxfordian argillite as a func-tion of relative humidity: experiments and modelling. Geochimica et Cosmochimica Acta, Elsevier, 2016Elsevier, , 186, pp.91-104. 10.1016Elsevier, /j.gca.2016 Accepted Manuscript This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractHaving previously demonstrated that the mineral assemblage of claystone can impose its pCO 2 under saturated conditions, we here study the effect of rock desaturation, i.e.the evaporation of pore water, on the partial pressure of CO 2 (pCO 2 ) in CallovianOxfordian argillite from the Paris Basin (France). In this new study, which combines experiments at room temperature and geochemical modelling, we examine the primary role of capillary forces on chemical equilibria for relative humidity values ranging between 50% and 100%. In particular we are able, without any fitting parameters, to model the experimental decrease of pCO 2 as a function of decreasing water content in the argillite. This application to a complex natural system not only confirms the theoretical concepts of geochemistry in capillary contexts, but is promising with respect to other systems, both natural (soil, rock) and industrial (ceramics, granular material).

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Section: Geochemistry Of the Callovian-oxfordian Formation In The Conmentioning

confidence: 99%

Equilibrium partial pressure of CO2 in Callovian–Oxfordian argillite as a function of relative humidity: Experiments and modelling

Lassin

Marty

Gailhanou

et al. 2016

Geochimica et Cosmochimica Acta

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“…Because such rocks display very small values for both hydraulic conductivity (K h ) and water content (u e ) (Matray et al, 2007), diffusion is considered to be the main transport mechanism governing radionuclide migration. The occurrence of natural fractures in such formations allows increasing water flux and thus radionuclide migration, however (Savoye et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

The internal architecture and permeability structures of faults in shale formations

Dick¹,

Wittebroodt²,

Courbet³

et al. 2016

Filling the Gaps - From Microscopic Pore Structures to Transport Properties In Shales

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The evaluation of fluid flow through fractures and faults is of primary importance for the long-term performance assessment of radioactive waste repositories in shale formations and could be used to assess CO 2 storage security or the integrity of caprocks and reservoir capacity. This study focuses on the structural evolution within brittle to ductile shear zone in order to understand permeability enhancement and sealing processes affecting a strike-slip fault system within the Toarcian shale formation from the Tournemire Underground Research Laboratory (URL), southern France. A combination of quantitative field measurements and laboratory and in situ experiments was used to estimate the fluid-flow properties of a fractured shale formation. Results indicate that microfractures govern the matrix porosity in the damage zone and play an increasingly dominant role in fluid flow along the boundary between fault core and fault damage zone.

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“…Moreover, to assess the influence of bacteria on iron/argillite interactions, two percolation experiments were carried out at 60°C (temperature representative of those encountered close to the disposal cell over a few hundred years), with iron (powder and NEA/RWM/R(2013)9 rod) and Toarcian argillite (Matray, 2007) involving an artificial crack. Both experiments lasted 13 months, one under biotic conditions (with SRB and IRB) and the other under abiotic conditions (no bacteria) (Chautard, 2012).…”

Section: Scientific Approach and Main Resultsmentioning

confidence: 99%

Analysis of mineralogical and deformation-induced transformations of Nizhnekansky Massif rocks to estimate their retention capacity in geological disposal and isolation of radioactive waste

Петров¹,

Poluektov²,

Hammer³

et al. 2015

gzh

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JT03354141Complete document available on OLIS in its original format This document and any map included herein are without prejudice to the status of or sovereignty over any territory, to the delimitation of international frontiers and boundaries and to the name of any territory, city or area. . Since then, there have been major developments in a number of national geological disposal programmes and significant experience has been obtained in preparing and reviewing cases for the operational and long-term safety of proposed and operating geological repositories. Especially, three national programmes are now, or will shortly be, at the stage of licence application for a deep geological repository for the disposal of spent nuclear fuel or high-level and other long-lived radioactive waste.Thus, the purpose of this Symposium, "The Safety Case for Deep Geological Disposal of Radioactive Waste: 2013 State of the Art", was to assess the practice, understanding and roles of the safety case, as applied internationally at all stages of repository development, including the interplay of technical, regulatory and societal issues, as they have developed since 2007.The Symposium was organised and hosted by the Nuclear Energy Agency (NEA) of the Organisation for Economic Co-operation and Development (OECD), and co-sponsored by the EC and the IAEA.The 2013 Symposium attracted 168 participants from 65 organisations and 17 countries and international bodies.The Symposium was chaired by Klaus-Jürgen Röhlig, who is also the Chair of the NEA Integration Group for the Safety Case (IGSC). The planning and implementation of the symposium were supported by the efforts of staff of the NEA and of the programme committee.This synopsis was drafted by Trevor Sumerling (Safety Assessment Management Ltd, UK), finalised under the direction of the Chair and Gloria Kwong of the NEA and approved by the programme committee. Deep Geological Repositories (1999). Since then the concept has been elaborated on in NEA documents describing the nature and purpose of safety cases , 2013a and has been the basis of NEA/IGSC collaborative projects and EU projects (EC, 2011). The concept has been taken up in international safety standards as promulgated by the IAEA (2006, 2011) and recently in ICRP recommendations on the application of the system of radiological protection to geological disposal (ICRP, 2013).Meanwhile, the concept has been developed practically and applied within many national radioactive waste disposal programmes and also taken up in some national regulatory guides. The NEA has used the concept as a guide in several international peer reviews of national repository programmes and safety documentation. In Europe, the EU Directive 2011/70/Euratom (EU, 2011) establishes a framework to ensure responsible and safe management of spent fuel and radioactive waste by member states that, inter alia, requires a decision-making process based on safety evidence and arguments that mirrors the safety case concept. Aims of the symposiumThe purpose of thi...

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Desaturation and structure relationships around drifts excavated in the well-compacted Tournemire's argillite (Aveyron, France)

Cited by 103 publications

References 11 publications

Equilibrium partial pressure of CO2 in Callovian–Oxfordian argillite as a function of relative humidity: Experiments and modelling

Equilibrium partial pressure of CO2 in Callovian–Oxfordian argillite as a function of relative humidity: Experiments and modelling

The internal architecture and permeability structures of faults in shale formations

Analysis of mineralogical and deformation-induced transformations of Nizhnekansky Massif rocks to estimate their retention capacity in geological disposal and isolation of radioactive waste

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