Conference Agenda

The role of bentonite in the high-level radioactive waste repository design

Eva-Maria Gottron, Merle Bjorge, Stephen Klimke, Marc Wengler, Anne Bartetzko, Wolfram Rühaak

Federal Company for Radioactive Waste Disposal (BGE), Germany

Preliminary design of a disposal facility for high-level radioactive waste in claystone

Michael Werres¹, Stephen Klimke¹, Dominik Gottron¹, Frederik Fahrendorf¹, Niklas Bertrams², Thomas Lohser¹, Wolfram Rühaak¹

¹Bundesgesellschaft für Endlagerung mbH, Germany; ²BGE Technology GmbH, Germany

Characterization of the Lower Cambrian and the Lower Triassic clayey formations in terms of the potential for the sitting of Deep Geological Repository of radioactive waste in Lithuania

Jurga Lazauskienė^1,2, Jolanta Čyžienė²

¹Vilnius University, Lithuania; ²Lithuanian Geological Survey under Ministry of Environment

Geological variability of the Opalinuston-Formation in Southern Germany: new insights from the research project SEPIA

Thomas Mann¹, Tilo Kneuker¹, Géraldine Nicole Zimmerli², Jochen Erbacher^1,3, André Bornemann¹, Bernhard Schuck¹, Reiner Dohrmann^1,3, Christoph Neukum¹, Lukas Pollok¹

¹Federal Institute for Geosciences and Natural Resources (BGR), Hannover, Germany; ²Department of Geosciences, University of Fribourg, 1700 Fribourg, Switzerland; ³State Authority for Mining, Energy and Geology (LBEG), Hannover, Germany

OVERVIEW OF GEODYNAMIC EVOLUTION EFFECT ON HYDROGEOLOGICAL PERFORMANCE OF DEEP GEOLOGICAL REPOSITORY SITE FOR RAWASTE. FEED BACK AND LESSONS LEARNED FROM TWO DECADES OF STUDIES

Hakim BENABDERRAHMANE, Johan HOLMEN

GeoRem Oy, Finland

Kiirunavaara Ca-smectite, northern Sweden: a natural analogue of long-term clay stability

Raphael Schneeberger¹, Ulf. B Andersson², Albert Gilg³, Illya Bindeman⁴, Reiner Dohrmann⁵, Sirpa Kumpulainen⁶, Leena Kiviranta⁶, W. Crawford Elliott⁷, J. Marion Wampler⁷, Cyprian Ozigbo⁸, Igor Villa⁹, Tsubasa Otake¹⁰, Ryosuke Kikuchi¹⁰, Tatsuya Fujimura¹¹, Tsutomu Sato¹⁰, Satoru Suzuki¹², Takahiro Goto¹², Shuhei Nemoto¹², Rizlan Bernier-Latmani¹³, Natalia Jakus¹³, Russell W. Alexander¹⁴, Nicolas Michau¹⁵, Mehran Behazin¹⁶, Alex Hughes¹⁷, Simon Norris¹⁷, Ville Heino¹⁸, Patrik Sellin¹⁹, Daniel Svensson¹⁹, Olivier X. Leupin¹

¹Nagra, Switzerland; ²LKAB, Sweden; ³Technische Universität München, Germany; ⁴University of Oregon, USA; ⁵BGR, Germany; ⁶Mitta, Finland; ⁷Georgia State University, USA; ⁸Columbine Corporation, USA; ⁹University of Bern, Switzerland and University of Milan Bicocca, Italy; ¹⁰Faculty of Engineering, Hokkaido University, Japan; ¹¹Graduate School of Engineering, Hokkaido University, Japan (currently: Civil Engineering Department, Nuclear Facilities Division, Taisei Corporation, Japan); ¹²NUMO, Japan; ¹³EPFL, Switzerland.; ¹⁴Bedrock Geosciences, Switzerland; ¹⁵Andra, France; ¹⁶NWMO, Canada; ¹⁷NWS, UK; ¹⁸Posiva, Finland; ¹⁹SKB, Sweden

Unveiling early diagenetic carbonate precipitation: Sequential C-isotope analysis of calcite and siderite in Opalinus Clay

Stephan Wohlwend¹, Lukas Aschwanden¹, Carmen Zwahlen¹, Martin Mazurek¹, Gaudenz Deplazes²

¹Institute of Geological Sciences, University of Bern, 3012 Bern, Switzerland; ²Nagra, 5430 Wettingen, Switzerland

Geochemistry of pore waters in Opalinus Clay at the Mont Terri Rock Laboratory within the Bitumen-Nitrate-Clay interaction experiment

Torben Weyand¹, Michael Jendras¹, Katrien Hendrix², Nele Bleyen²

¹Bundesamt für die Sicherheit der nuklearen Entsorgung (BASE), Germany; ²Belgian Nuclear Research Centre (SCK CEN), Belgium

39Ar and 37Ar in deep groundwater: Evaluation regarding young components, cross-formation flow and in-situ production

Daniel Rufer¹, Roland Purtschert², H. Niklaus Waber³, Michael Heidinger⁴, Daniel Traber⁵, Jens Becker⁵

¹Institute of Geological Sciences, University of Bern, Bern, Switzerland; ²Climate & Environmental Physics, Physics Institute, University of Bern, Bern, Switzerland; ³WaterGeoChem Consulting, Bern, Switzerland; ⁴Hydroisotop GmbH, Schweitenkirchen, Germany; ⁵Nagra, Wettingen, Switzerland

Geochemical profiles in the hydrogeological system of the Opalinus Clay at Mont Terri, Switzerland

Marie Bonitz¹, Anja Maria Schleicher², Theresa Hennig¹, David Jaeggi⁴, Michael Kühn^1,3

¹GFZ German Research Centre for Geosciences, Fluid Systems Modelling, Potsdam, Germany; ²GFZ German Research Centre for Geosciences, Inorganic and Isotope Geochemistry, Potsdam, Germany; ³University of Potsdam, Institute of Geosciences, Potsdam, Germany; ⁴Federal Office of Topography Swisstopo, Wabern, Switzerland

Crushed claystone used as material for the construction of EBS-components in repositories for nuclear waste – A generic methodology for material selection

Marvin Middelhoff

Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH, Germany

Rock mass response to processes in a Sandwich shaft sealing system

Jürgen Hesser¹, Matthias Hinze², Markus Furche¹, David Jaeggi³, Senecio Schefer³

¹Federal Institute for Geosciences and Natural Resources (BGR), Germany; ²Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH, Germany; ³Bundesamt für Landestopografie (swisstopo), Switzerland

Modelling sulfide corrosion in the Swiss HLW repository under various repository settings

Jin Ma¹, Paul Wersin¹, Nikitas Diomidis²

¹University of Bern, Switzerland; ²Nagra, Switzerland

As-Placed Dry Density of Gap Fill Material in Overbreak Zones within the Placement Room

CHANG SEOK KIM, KENNETH BIRCH, PETER KEECH

Nuclear Waste Management Organization, Canada

Feedback on the multi-scale mechanical and technical demonstration of drift construction at the French URL

Jad Zghondi, Gilles Armand, Jana Jaber, Minh-ngoc Vu, Jan Cornet, Carlos Plua, Roy Chaaya

Andra, France

A wireless data transmission system for the future deep geological repository

José Luis García-Siñeriz¹, Susana Tuñón¹, María Rey¹, Juan Carlos Mayor², Katja Emmerich³, Matthias Hinze⁴, David Jaeggi⁵, Senecio Schefer⁵

¹Amphos 21 Consulting S.L., Spain; ²Empresa nacional de residuos radiactivos (Enresa), Spain; ³Karlsruhe Institute of Technology (KIT), IMB/MPA/CMM, Karlsruhe, Germany; ⁴Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH, Braunschweig, Germany; ⁵Bundesamt für Landestopografie (swisstopo), St-Ursanne, Switzerland

Observation of saturation processes in the Sandwich experiment with ERT (URL Mont Terri)

Markus Furche

Bundesanstalt für Geowissenschaften und Rohstoffe, Germany

Influence of polysulfide radicals in measuring corrosion rates of a carbon steel API 5L X65 in contact with cement grout in future nucle-ar waste disposal program

Yendoube Charles SANO MOYEME¹, Stéphanie BETELU¹, Johan BERTRAND², Stéphane GABOREAU¹, Karine GROENEN-SERRANO³

¹BRGM, Orléans, France; ²ANDRA, Châtelet-Malabry, France; ³LGC, Toulouse, France

Estimating Water Retention of Compacted Bentonite with Cat-Boost: Integrating Physical Model Residuals and Penalized Learning

Muntasir Shehab, Reza Taherdangkoo, Christoph Butscher

Institute of Geotechnics, TU Bergakademie Freiberg, Gustav-Zeuner-Str. 1,Freiberg, 09599, Germany

Full-Scale In-Situ System Test (FISST) at the Finnish spent nuclear fuel disposal facility. Analysis and simulation.

Xavier Pintado¹, Mika Niskanen²

¹Mitta Engineering Oy, Finland; ²Posiva Oy, Finland

MANAGEMENT OF SORPTION DATA IN SUPPORT TO RADIOACTIVE WASTE MANAGEMENT

Stéphane Brassinnes¹, Marta López-García², Darío Pérez², Maria Abada², Irene Canals², Albert Nardi², Lara Duro², David García²

¹Belgian Agency for Radioactive Waste and Enriched Fissile Materials (ONDRAF/NIRAS); ²Amphos21

Numerical analysis of permeability in sphere-platelet mixtures

Ryunosuke Oishi¹, Tsubasa Yagi², Otono Miura¹, Shusaku Harada¹

¹Hokkaido University, Japan; ²Radioactive Waste Management Funding and Research Center, Japan

Trace elements in Dutch Paleogene clays

Erika Neeft¹, Thilo Behrends², Alwina Hoving³, Jasper Griffioen³, Anne-Catherine Dieudonné⁴, Phil Vardon⁴, Marja Vuorio¹

¹COVRA, Netherlands, The; ²Utrecht University; ³TNO; ⁴Delft University of Technology

Effect of environmental conditions on the sorption of 241Am(III) on natural clayrocks and their main constituents

Liesbeth Van Laer¹, Dorien Verhaegen¹, Greet Verstrepen¹, Delphine Durce¹, Norbert Maes¹, Stéphane Brassinnes²

¹SCK CEN, Belgium; ²NIRAS/ONDRAF, Belgium

Radionuclide transport in variably water-saturated compacted clays: a pore-scale view

Yuankai Yang¹, Ravi A. Patel², Yaoting Zhang³, Nikolaos I. Prasianakis⁴, Jenna Poonoosamy¹, Guido Deissmann¹, Sergey V. Churakov^4,5, Dirk Bosbach¹

¹Forschungszentrum Jülich, Germany; ²Karlsruhe Institute of Technology (KIT), Germany; ³Queen’s University, Canada; ⁴Paul Scherrer Institut, Switzerland; ⁵University of Bern, Switzerland

Insights into the Interactions of Clay Minerals and Humic Acids: A Molecular Dynamics Study

Kanato Matsushima¹, Yuta Fukatsu², Takamitsu Ishidera², Ayano Eguchi², Kenji Yotsuji², Yukio Tachi³, Takahiro Ohkubo¹

¹Graduate School of Engineering, Chiba University, Japan; ²Nuclear Fuel Cycle Engineering Laboratories, Japan Atomic Energy Agency, Japan; ³Horonobe Underground Research Center, Japan Atomic Energy Agency, Japan

Transport Properties of Water in a Polydisperse Coarse-Grained Model of Sodium Montmorillonite

Yaoting Zhang¹, Mikaella Brillantes², Justine Kuczera¹, Keyvan Ferasat¹, Scott Briggs³, Chang Seok Kim³, Jason D. Giallonardo³, Thomas G. Tranter⁴, George Opletal⁵, Yuankai Yang⁶, Jane Howe², Laurent K. Beland¹

¹Department of Mechanical and Materials Engineering, Queen’s University, Kingston, Canada.; ²Department of Materials Science and Engineering, University of Toronto, Toronto, Canada; ³Nuclear Waste Management Organization, Toronto, Canada; ⁴Ionworks Technologies Inc, Pittsburgh, United States of America; ⁵Commonwealth Scientific and Industrial Research Organization, Data61, Melbourne, Australia; ⁶Institute of Energy and Climate Research – Nuclear Waste Management (IEK-6) and JARA-CSD, Forschungszentrum Jülich GmbH, Jülich, Germany

Comparison of experimental diffusion data of various cationic elements in rock samples from the deep-hole drilling campaign in northern Switzerland with model predictions by the ClaySorDif model

Martin A. Glaus¹, Petar Bunic¹, Dmitrii A. Kulik¹, Cyrill Lang¹, George D. Miron¹, Luc R. Van Loon¹, Raphael A.J. Wüst²

¹Paul Scherrer Institut, Switzerland; ²Nagra, Switzerland

Iron(II)-montmorillonite interaction: experimental results and model-ling for dispersed and compacted systems

Jebril HADI¹, Mirjam KICZKA¹, Andreas JENNI¹, Paul WERSIN¹, Jules GOETHALS², Jean-Marc GRENECHE³, Olivier LEUPIN⁴, Nikitas DIOMIDIS⁴

¹Institute of Geological Sciences, University of Bern, Bern, Switzerland; ²Laboratoire Subatech, Nantes, France; ³Le Mans Université, Le Mans, France; ⁴Nagra, Wettingen, Switzerland

Electrostatic interactions at clay mineral surfaces: linking geochem-istry with geomechanical properties

Christophe Tournassat^1,2, Wenming Dong², Nicolas Marty³, Sylvain Grangeon³, Carl Steefel²

¹Institut des Sciences de la Terre d’Orléans, Université d’Orléans, CNRS, BRGM, OSUC, Orléans 45071, France; ²Earth and Environmental Sciences Area, Lawrence Berkeley National Laboratory, Berkeley, CA, USA; ³BRGM, Orléans, France

Transport experiments in claystone: electrostatic effects and preferential pathways

Andreas Jenni¹, Mirjam Kiczka¹, Carmen Zwahlen¹, Urs Mäder², Hans Meeussen³, Thomas Gimmi^1,4

¹University of Bern, Bern, Switzerland; ²Rock-Water Consulting, Boll, Switzerland; ³NRG, Petten, the Netherlands; ⁴Laboratory for Waste Management, Paul Scherrer Institut, Villigen, Switzerland

Experimental investigation of the changes in transport properties of Opalinus claystone/concrete interface samples from the Mont Terri CI experiment

Norbert Maes¹, Quoc Tri Phung¹, Thi Nhan Nguyen^1,2, Anneleen Vanleeuw¹

¹SCK CEN, Belgium; ²KULeuven, Belgium

Successful gas tests at the GAs permeable Seal Test (GAST) - Highlights and lessons learned (Grimsel Test Site, CH)

Emiliano Stopelli¹, Thomas Spillmann¹, Bill Lanyon², Rémi de La Vaissière³, Jean Talandier³, Jeremy Chen⁴, Simon Norris⁵, Stratis Vomvoris¹, Irina Gaus¹, Florian Kober¹

¹Nagra, Switzerland; ²Fracture Systems Ltd, United Kingdom; ³ANDRA, France; ⁴NWMO, Canada; ⁵NWS, United Kingdom

Cement-Bentonite Interaction with Different Cement Materials at Elevated Temperatures 1: Experiments

Ryohei Kawakita¹, Sohtaro Anraku¹, Yuji Hanamachi², Seiichiro Mitsui¹, Hiroshi Sasamoto¹, Morihiro Mihara¹

¹Japan Atomic Energy Agency, Japan; ²QJ Science Ltd., Japan

Gains and losses of exchangeable cations in ‘alternative bentonite buffer material in-situ tests’ (ABM-1, -2 and -5) after heating from 140 °C to 250 °C - what has caused observed differences?

Reiner Dohrmann^1,2, Jens Gröger-Trampe^1,2, Stephan Kaufhold²

¹LBEG, Germany; ²BGR, Germany

Evolution of microbial populations under the influence of increasing temperature in the Callovian-Oxfordian clay-rich rock

Mélanie Lundy¹, Marc Labat², Sylvie Daumas³, Stefan Wechner⁴, Yannick Linard¹

¹Andra, France; ²Aix-Marseille Université, France; ³CFG, France; ⁴Hydroisotop GmbH, Germany

Differences between the basal spacings of random powder patterns and air-dried oriented aggregates of bentonite samples

Ana Beatriz Zabala¹, María Victoria Villar¹, Jaime F. Cuevas²

¹CIEMAT, Spain; ²UAM, Spain

Hydrogeochemical processes occurring in excavated argillaceous rocks stored at the surface as heaps and consequences on water chemistry

Myriam I. Agnel¹, Adrien Schwindt¹, Mathieu Debure², Joachim Tremosa³, Yves Thiry¹, Paul-Olivier Redon¹

¹Andra, Centre de Meuse/Haute-Marne, 55290 Bure, France; ²BRGM, French Geological Survey, 3 av. Claude-Guillemin, 45060 Orléans, France; ³Geostock, 92500 Rueil-Malmaison, France

A mechanistic understanding of bentonite alteration at corroding iron interfaces

Haydn Martin Haynes¹, Graham Kenyon¹, James Hesketh¹, Cristiano Padovani¹, Lorraine Field², Nikitas Diomidis³

¹Jacobs Clean Energy, Didcot, United Kingdom; ²British Geological Survey, Keyworth, United Kingdom; ³Nagra, Wettingen, Switzerland

Mutual effects of pH, matrix elements and organic ligands on the mobility of U(VI) in bentonite systems

Katja Schmeide¹, Thimo Philipp^1,2, Claudia Sieber¹, Nina Huittinen¹

¹Helmholtz-Zentrum Dresden - Rossendorf, Institute of Resource Ecology, Germany; ²Present address: Federal Office for the Safety of Nuclear Waste Management (BASE), Germany

Quantitative analysis of the mineralogical composition of bentonites by full pattern fitting using the powdR package

Stephen Hillier^1,2, Stephan Kaufhold³, Kristian Ufer³, Jan Dietel⁴, Adrián Lorenzo⁵, Mercedes Suárez⁵

¹James Hutton Institute, United Kingdom; ²Department of Soil and Environment, SLU, Uppsala, Sweden; ³BGR, Hannover, Germany; ⁴Landeslabor Berlin-Brandenburg, Berlin, Germany; ⁵Universidad de Salamanca, Salamanca, Spain

Acidification and CO2-degassing in bentonites triggered by oxida-tion of Fe(II)–containing minerals

Stefan Dultz

Leibniz Universität Hannover, Germany

Dynamic and static experiments for the identification of the effect of transient processes on corrosion

Ana María Fernández, Ursula Alonso, Paula Nieto, Manuel Mingarro, Tiziana Missana

CIEMAT, Spain

Effect of organic molecules on radionuclide retention in COx clay rock: the case of Ni-TBP/EDTA mixtures

Romain V.H. Dagnelie¹, Marwa Assaf¹, Emilie Thory¹, Pierre Henocq²

¹Université Paris-Saclay, CEA, Service de Physico-Chimie, 91191, Gif-sur-Yvette; ²Andra, R&D Division, parc de la Croix Blanche, 92298, Châtenay-Malabry

Distorting mirrors – new perspectives on the layer charge reduction phenomena in heat-treated smectites: implications for CEC measurements in bentonites

Artur Kuligiewicz, Arkadiusz Derkowski, Nadine J. Kanik

Institute of Geological Sciences, Polish Academy of Sciences, Poland

Self-sealing potential of fractures as a result of hydration, shear, and temperature

Robert Cuss¹, Andrew Wiseall², Jon Harrington¹

¹British Geological Survey, United Kingdom; ²now at Nuclear Waste Services, United Kingdom

Effect of Sodium Occupancy and Solute Concentration on the Swelling Behaviour of Poorly Indurated Boom Clay

Hassan AL MAIS^1,2,3, Frederic COLLIN¹, Yu-Jun CUI², XiangLing LI³, Elie VALCKE³, Lian WANG³, Suresh SEETHARAM³, Temenuga GEORGIEVA³

¹Université de Liège, Belgium; ²Ecole des Ponts et Chaussées, Champs-sur-Marne, France; ³SCK-CEN, Mol, Belgium

The anisotropic creep behaviour and the long-term strength of Opalinus Clay

Lina Gotzen¹, Lisa Winhausen¹, Mohammadreza Jalali¹, Florian Amann^1,2

¹Department of Engineering Geology and Hydrogeology, RWTH Aachen, Germany; ²Fraunhofer Research Institution for Energy Infrastructures and Geothermal Systems IEG, Germany

Numerical analyses of geological barrier integrity under parameter uncertainty

Jan Thiedau, Maximilian Bittens, Maßmann Jobst, Mayr Sibylle

Bundesanstalt für Geowissenschaften und Rohstoffe, Germany

Assessment of in-situ heater experiments conducted in the Callo-vo-Oxfordian claystone based on the French high-level radioactive waste disposal concept

Carlos Plúa¹, Minh-Ngoc Vu², Frédéric Bumbieler², Armand Gilles¹

¹Andra, Meuse/Haute-Marne Underground Research Laboratory, Bure, France; ²Andra, Châtenay-Malabry, France

HE-E heating experiment in the Mont Terri rock laboratory - sampling of a hot, unconsolidated granular bentonite buffer after 12 years of heating during continued operation

Florian Kober¹, Urs Mäder², Maria Villar³, Bill Lanyon⁴

¹Nagra, Switzerland; ²Rock Water Consulting, Boll, Switzerland; ³CIEMAT, Madrid, Spain; ⁴Fracture Systems Ltd., St. Ives, Great Britain

A standard thermodynamic-based extension of the Modified Cam-Clay model for plastic-viscoplastic geomaterials

Simon Raude, Goustan Bacquaert, Kyrylo Kazymyrenko, David Haboussa

EDF, France

Enhancements to a Hydromechanical Material Model for Compacted Bentonite

Ola Kristensson¹, Mattias Åkesson²

¹Clay Technology, Lund, Sweden; ²Swedish Nuclear Fuel and Waste Management Co, Solna, Sweden

HYDRO-MECHANICAL BEHAVIOUR OF BENTONITE AT HIGH TEMPERATURE

NATALIA GIMENO, RUBÉN JAVIER IGLESIAS, GUILLERMO GARCIA, MARIA VICTORIA VILLAR

CIEMAT, Spain

Geochemical modelling of mineral-water reaction between Bavarian bentonite B25 and Opalinus clay pore solution

Kyra Jantschik, Artur Meleshyn

GRS gGmbH, Germany

Thermochemical alterations in montmorillonite: Experiment constraints in the presence of organic anion ligands

Ritwick Sudheer Kumar, Laurence N. Warr, Georg H. Grathoff, Balu R. Thombare

University of Greifswald, Institute for Geography and Geology, Department of Economic Geology and Mineralogy, Greifswald, Germany

Tracking bentonite-water interactions by stable-H- and O-isotope exchange over a thermal gradient: First isotopic results from the Alternative Buffer Materials 2 and 5 bentonites

Nadine J. Kanik¹, Fred J. Longstaffe², Arkadiusz Derkowski¹, H. Albert Gilg³

¹Institute of Geological Sciences, PAS, Poland; ²The University of Western Ontario; ³Technical University of Munich

Engineered Barrier 200C – High temperature in-situ experiment

Jiří Svoboda, Radek Vašíček

Czech Technical University, Czech Republic

Modeling of the HotBENT test using COMSOL Multiphysics

Daniel Malmberg¹, Alex Spetz¹, Chang Seok Kim²

¹Clay Technology Lund AB, Sweden; ²Nuclear Waste Management Organisation, Canada

Modelling the Disturbed Rock Zone behaviour in a Deep Geological Repository

Nandini Adla, Pavan Kumar Bhukya, Dali Naidu Arnepalli

Deaprtment of Civil Engineering, Indian Institute of Technology, Madras, India

Elastic-plastic components in void ratio with suction

Tomoyoshi Nishimura¹, Hanbing Bian², Isam Shahrour³

¹Ashikaga University, Japan; ²Polytech'Lille, Université de Lille, France; ³Polytech'Lille, Université de Lille, France

Benchmark case for non-isothermal multiphase flow and reactive transport for radioactive waste disposal

Javier Samper¹, Alba Mon¹, Etienne Ausborde², Tianfu Xu³, Yu Han³, Milan Hokr⁴, Asta Narkuniene⁵, Luis Montenegro¹, Brahim Amaziane², Mustapha Elossmani², Y Yuan³, Jan Sembera⁴, Povilas Poskas⁵

¹Universidad de A Coruña, Spain; ²E2S UPPA, CNRS, LMAP, Universite de Pau et des Pays de l’Adour, Pau, France; ³College of New Energy and Environment, Jilin University, Changchun 130021, P. R. China; ⁴Technical University of Liberec (TUL) Czech Republic; ⁵Lithuanian Energy Institute, Nuclear Engineering Laboratory, Kaunas, Lithuania

Experimental and numerical modelling of binary bentonite-based mixture compressibility

Arisleidy Mesa-Alcantara¹, Enrique Romero^1,2, Joel Torres-Serra², Nadia Mokni³

¹International Centre for Numerical Methods in Engineering (CIMNE), Barcelona, Spain; ²Universitat Politècnica de Catalunya, Barcelona, Spain; ³Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Fontenay-aux-Roses, France

The influence of faults on the geomechanical properties of Opal-inus Clay – First results from the PF-A experiment

Lisa Winhausen¹, Florian Amann^1,2, Martin Ziegler³, Chris J. Marone^4,5

¹Department of Engineering Geology, RWTH Aachen, Germany; ²Fraunhofer Research Institution for Energy Infrastructures and Geothermal Systems IEG, Aachen, Germany; ³Swiss Federal Office of Topography (swisstopo), Mont Terri URL, St-Ursanne, Switzerland; ⁴Dipartimento di Scienze della Terra La Sapienza Università di Roma, Italy; ⁵Department of Geosciences, Pennsylvania State University, Pennsylvania, USA

Diffusion of dissolved gases in clay: a collaborative modelling exercise of EURAD GAS

Elke Jacops¹, Li Yu¹, Joan Govaerts¹, Abhishek Gupta², Michael Pitz^3,8, Gesa Ziefle³, Anne-Catherine Dieudonné⁵, Asta Narkuniene⁶, Frédéric Collin⁷, Gilles Corman⁷, Séverine Levasseur⁴

¹SCK CEN, Belgium; ²Aalto University, Finland; ³BGR, Germany; ⁴ONDRAF/NIRAS, Belgium; ⁵TU Delft, The Netherlands; ⁶Lei, Lithuania; ⁷ULiège, Belgium; ⁸TU Bergakademie Freiberg, Germany

Experimental Study on Evaluation Method of Apparent Erosion Rate Constant of Bentonite using X-ray CT Images

Norihisa Osawa¹, Tomoko Ishii^1,2, Kenji Ishii³, Yuichi Niibori²

¹Taiheiyo Consultant Co., Ltd., Japan; ²Tohoku University, Japan; ³Kajima Corporation, Japan

Modeling of gas propagation along a micro-tunnel in the Meuse / Haute-Marne Underground Research Laboratory

Cécile Coulon¹, Guillermo Martinez¹, Catherine Yu¹, Thomas Cavalera¹, Mohamed Hayek¹, Rémi de La Vaissière²

¹INTERA Incorporated, France/Switzerland/United States; ²ANDRA, Bure, France

The effect of an alkaline plume on the self-sealing capacity of Boom Clay evidenced by high resolution computed tomography and hy-draulic conductivity measurements

Miroslav Honty¹, Ivan Josipovic², Matthieu N. Boone², Severine Levasseur³, Xavier Sillen³

¹SCK-CEN, Belgian Nuclear Research Center, Mol, Belgium; ²UGent, Department of Physics and Astronomy, Gent University, Belgium; ³ONDRAF/NIRAS, Belgian National Agency for Radioactive Waste and Enriched Fissile Materials, Brussels, Belgium

Modelling gas drainage in argillite pores with SPH method

Kayani Ganeshalingam^1,2, Magdalena Dymitrowska¹, Djimédo Kondo²

¹Institut de Radioprotection et de Sûreté Nucléaire(IRSN), PSE-ENV/SPDR/LETIS, France; ²Institut Jean le Rond d'Alembert, France

The Hydro-mechanical Interaction between Different Tunnel Support Strategies and the Excavation Damaged Zone (EDZ)

Sina Shivaei¹, Maximilian Schoen¹, Arash Alimardani Lavasan², Torsten Wichtmann¹

¹Chair of Soil Mechanics, Foundation Engineering and Environmental Geotechnics, Ruhr University Bochum, Bochum, Germany; ²Department of Civil Engineering, Luxembourg University, Luxembourg, Luxembourg

Mini GAST: Experimental Upscaling of an Engineered Gas Permeable Seal

Enrique Romero^1,2, Clara Alvarado², Antonio Lloret¹, Juliana Knobelsdorf², Thomas Spillmann³

¹Universitat Politècnica de Catalunya (UPC), Barcelona, Spain; ²International Centre for Numerical Methods in Engineering (CIMNE), Barcelona, Spain; ³National Cooperative for the Disposal of Radioactive Waste (Nagra), Wettingen, Switzerland

Laboratory scale experimental assessment of bentonite-sand mixtures

Caroline C. Graham¹, Jon F. Harrington¹, Qian Zhang¹, Jean Talandier², Remi de La Vaissière²

¹British Geological Survey (BGS), United Kingdom; ²Agence nationale pour la gestion des déchets radioactifs (ANDRA), France

Experimental study and numerical modeling of poromechanical be-haviour of Callovo-Oxfordian claystone under drained and undrained conditions

Yuhao ZHANG¹, Shouyi XIE¹, Jianfu SHAO¹, Minh-Ngoc VU²

¹University of Lille, France; ²Andra, France

Hydro-mechanical Properties of Rock and Bentonite Mixtures for Gas Management within Geological Disposal Facilities

Elise Wai-Ming Mouat¹, Ian L Molnar¹, Christopher McDermott¹, Bryne Ngwenya¹, Clare Bird², George Towler³

¹The University of Edinburgh, United Kingdom; ²Stirling University; ³Quintessa ltd