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Environmental Earth Sciences

, 75:1350 | Cite as

Analysis of the THM behaviour in a clay-based engineered barrier system (EBS): modelling of the HE-E experiment (Mont Terri URL)

  • Xuerui Wang
  • Hua Shao
  • Jürgen Hesser
  • Olaf Kolditz
Thematic Issue
Part of the following topical collections:
  1. DECOVALEX 2015

Abstract

To understand the complex thermo-hydro-mechanical (THM) processes and their evolution in a clay-based engineered barrier systems (EBS) during the closure phase of a geological repository for radioactive waste, a 1:2 scale in situ heating experiment (HE-E experiment) has been ongoing since 2011 in the Mont Terri Rock laboratory. Based on the experimental data, a fully coupled THM 3D simulation using the finite-element program OpenGeoSys was carried out. The main objectives of the simulation were to interpret the experimental observations, to understand the thermally induced THM interactions and to analyse the different material properties. Five experimental phases were numerically interpreted, in order to take into account the changes in the temporary material properties during experimental operations. These included the tunnel excavation, the ventilation, the emplacement of the bentonite EBS, the heating phase and the phase after shutdown of the heater. A non-isothermal Richards’ flow model was used to take into account the evaporation and vapour diffusion during the heating. The material behaviours of EBS in association with the saturation-dependent thermal conductivity and the water retention behaviour under high temperatures were analysed in detail. The strong thermal, hydraulic and mechanical anisotropic properties of the Opalinus Clay were described by a transversely isotropic model.

Keywords

Disposal of radioactive high-level waste THM coupling Thermal effects Clay-based material OpenGeoSys 

Notes

Acknowledgments

This work was funded by BMWi (Bundesmisterium für Wirtschaft und Energie, Berlin). The authors would like to thank BMWi for their financial and technical support of the DECOVALEX project work described in this paper. The statements made in the paper are, however, solely those of the authors and do not necessarily reflect those of funding organisation(s). Also, no responsibility is assumed by the authors for any damage to property or persons as a result of operation or use of this publication and/or the information contained therein.

References

  1. Åkesson M, Börgesson L, Kristensson O (2010) SR-Site Data report, THM modelling of buffer, backfill and other system components. SKB TR-10-44, Stockholm, SwedenGoogle Scholar
  2. Andersson C, Bàcena I, Bono N, Boergesson L, Cleall P, Forsmark T, Gunnarsson D, Johannesson L E, Ledesma A, Liedtke L, Luukkonen A, Pederson K, Puigomenech I, Pusch R, Rhén I, Rothfuchs T, Sanden T, Sineriz J L, Sugita Y, Svemar C, Thomas H (2005) Full-scale testing of the KBS-3 V concept for the geological disposal of high-level radioactive waste: PROTOTYPE REPOSITORY. Final report. Nuclear Science and TechnologyGoogle Scholar
  3. Booker JR, Savvidou C (1985) Consolidation around a point heat source. Int J Numer Anal Methods Geomech 9(2):173–184CrossRefGoogle Scholar
  4. Börgesson L, Fredrikson A, Johannesson LE (1994) Heat conductivity of buffer materials. SKB TR-94-29, Svensk Kärnbränslehantering ABGoogle Scholar
  5. Cosenza P, Ghoreychi M, De Marsily G, Vasseur G, Violette S (2002) Theoretical predication of poroelasitc properties of argillaceous rocks from in situ storage coefficient. Water Resour Res (America Geophysical Union) 38(10):1–12 (art 1207) Google Scholar
  6. De Bruyn D, Labat S (2002) The second phase of ATLAS: the continuation of a running THM test in HADES underground research facility. Mol Eng Geol 64(2–3):309–316CrossRefGoogle Scholar
  7. Ferrari A, Laloui L (2012) Advances in the testing of the hydro-mechanical behaviour of shales. In: Laloui L, Ferrari A (eds) Multiphysical testing of soils and shales. Springer, Berlin, pp 57–68Google Scholar
  8. Gaus I, Wieczorek K, Schuster K, Garitte B, Senger R, Vasconcelos R, Mayor JC (2014a) EBS behaviour immediately after repository closure in a clay host rock: HE-E experiment (Mont Terri URL). Geol Soc Lond Spec Publ 400:71–91CrossRefGoogle Scholar
  9. Gaus I, Garitte B, Senger R, Gens A, Vasconcelos R, Garcia-Sineriz JL, Trick T, Wiezorek K, Czaikowski O, Schuster K, Mayor JC, Velasco M, Kuhlmann U, Villar M V (2014b). The HE-E experiment: lay-out, Interpretation and THM modelling. Arbeitsbereicht NAB 14-53, May 2014Google Scholar
  10. Gens A, Vaunat J, Garitte B, Wileveau Y (2007) In situ behaviour of a stiff layered clay subject to thermal loading observations and interpretation. Geotechnique 57(2):207–228CrossRefGoogle Scholar
  11. Hudson JA, Jing L (2013) Demonstration of coupled models and their validation against experiment: The current phase DECOVALEX 2015. In: Feng XT, Hudson JA, Tan F (eds) Rock characterisation modelling and engineering design methods. CRC Press/Balkermam, Leiden, pp 392–396Google Scholar
  12. Huertas F, Fuentes-Cantillana JL, Jullien F, Rivas P, Linares J, Farina P, Ghoreychi M, Jockwer, N, Kickmaler W, Martinez M A, Samper J, Alonso E, Elorza FJ (2000) Full-scale engineered barriers experiment for a deep geological repository for high-level waste in crystalline host rock—phase II FEBEX II. Final report. Technical ENRESA 1/2000, MadridGoogle Scholar
  13. Johnson LH, Niemeyer M, Klubertanz G, Siegel P, Gribi P (2002) Calculations of the temperature evolution of a repository for spent fuel, vitrified high-level waste and intermediate level waste in Opalinus Clay. Nagra Technical Report NTB 01-04. Nagra, Wettingen, SwitzerlandGoogle Scholar
  14. Kahr G, Müller-Vonmoos M (1982) Wärmeleitfähigkeit von bentonit MX80 und von Montigel nach der heizdraht methode. Technical report, Nagra, NTB 82-06Google Scholar
  15. Lewis RW, Schrefler BA (1998) The finite element method in the static and dynamic deformation and consolidation of porous media, 2nd edn. Wiley, Chichester, pp 57–65Google Scholar
  16. Martin CD, Lanyon GW (2003) Measurement of in situ stress in weak rocks at Mont Terri Rock laboratory, Switzerland. Int J Rock Mech Min Sci 40(7–8):1077–1088CrossRefGoogle Scholar
  17. Mayor JC, Garcia-Sineriz JL (2007) Ventilation experiment in Opalinus Clay for disposal of radioactive waste in underground repositories. In: Bossart P, Nussbaum C (eds) Mont Terri project—Heater experiment, engineered barrier emplacement and ventilation experiment rep, vol 1. Swiss Geological Survey, Bern, pp 182–240Google Scholar
  18. Mueller HR, Weber HP, Koehler S, Vogt T (2012) The full-scale Emplacement (FE) Experiment at the Mont Terri URL. Clays in natural and engineered barriers for radioactive waste confinement—5 international meeting book of abstracts, France, p 923Google Scholar
  19. Olivella S, Carrera J, Gens A, Alonso EE (1994) Non-isothermal multiphase flow of brine and gas through saline media. Trans Porous Media 15(3):271–293CrossRefGoogle Scholar
  20. Philip JR (1957) de Vries DA (1957) Moisture movement in porous material under temperature gradients. EOS Trans 38:222–232Google Scholar
  21. Rizzi M, Seiphoori A, Ferrari A, Ceresetti D, Laloui L (2012) Analysis of the behaviour of granular MX-80 bentonite in THM processes. Nagra-Aktennotiz AN 12-102Google Scholar
  22. Romero E, Gómez R, 2013. Water and air permeability tests on deep core samples from Schlattingen SLA-1 borehole. Nagra-Arbeitsbericht NAB 13-51. Nagra, Wettingen, SwitzerlandGoogle Scholar
  23. Rutqvist J, Noorishad J, Tsang CF (1999) Coupled thermohydromechanical analysis of a heater test in unsaturated clay and fractured rock at Kamaishi Mine. Final report. SKI project number 98325, Berkeley, USAGoogle Scholar
  24. Rutqvist J, Börgesson L, Chijimatsu M, Kobayashi A, Nguyen TS, Jing L, Noorishad J, Tsang CF (2001) Thermohydromechanics of partially saturated geological media-governing equations and formulation of four finite element models. Int J Rock Mech Min Sci 38:429–442Google Scholar
  25. Sato H (2007) Thermodynamic model on swelling of bentonite buffer and backfill materials. In: Proceedings of the international meeting, clay in natural and engineered barriers for radioactive waste confinement, 17–18 Sep 2007, Lille, FranceGoogle Scholar
  26. Tang AM, Cui YJ (2010) Effects of mineralogy on thermo-hydro-mechanical parameters of MX80 bentonite. J Rock Mech Geotech Eng 2(1):91–96Google Scholar
  27. Teodori SP, Gaus I (eds) (2011) Long term performance of engineered barrier systems (PEBS). Mont Terri HE-E experiment: as built report. Nagra Arbeitsbericht NAB 11-25. Nagra, Wettingen, 125 ppGoogle Scholar
  28. Vargaftik NB (1975) Tables of the thermophysical properties of liquids and gases. Wiley, New YorkGoogle Scholar
  29. Villar M V (2002) Thermo-hydro-mechanical characterization of a bentonite from Cabo de Gata: a study applied to the use of bentonite as sealing material in high level radioactive waste repositories. ENRESA publicación técnica 04/2002, MadridGoogle Scholar
  30. Villar MV (2012) THM cells for the HE-E test: setup and first results. PEBS Reports D2.2.7a-VER.0. CIEMAT technical report CIEMAT/DMA/2G210/03/2012Google Scholar
  31. Wang Q, Tang AM, Cui YJ, Delage P, Gatmiri B (2012) Experimental study on the swelling 1 behaviour of bentonite/claystone mixture. Eng Geol 124:59–66CrossRefGoogle Scholar
  32. Wang XR, Shao H, Hesser J, Zhang CL, Wang WQ, Kolditz O (2014) Numerical analysis of thermal impact on hydro-mechanical properties of clay. J Rock Mech Geotech Eng 5:405–416CrossRefGoogle Scholar
  33. Wang XR, Shao H, Wang WQ, Hesser J, Kolditz O (2015) Numerical modelling of heating and hydration experiments on Bentonite Pellets. Eng Geol 198:84–106CrossRefGoogle Scholar
  34. Wermeille S, Bossart P (1999) In situ stress in Mont Terri region: data compilation. Technical Report 99-02. Mont Terri ProjectGoogle Scholar
  35. Wieczorek K, Miehe R, Garitte B (2011) Measurement of thermal properties of the HE-E buffer materials. PEBS Deliverable D2.2-5Google Scholar
  36. Wieczorek K, Miehe R, Garitte B (2013) Thermal characterisation of the HE-E buffer. PEBS Deliverable D2.2-9Google Scholar
  37. Wileveau Y (2005) THM behaviour of host rock: (HE-D) experiment: progress report. Part 1. Technical Report TR 2005-03Google Scholar
  38. Wileveau Y, Su K (2007) In situ thermal experiment carried out in Opalinus Clay and Callovo-Oxfordian claystones by Andra—experiment set-up and measurement results. ANDRA report, Paris, FranceGoogle Scholar
  39. Zhang CL, Wieczorek K, Rothfuchs T, Armand G, Lebon P (2009) Responses of the Opalinus Clay to heating during the HE-D experiment at Mont Terri. In: Proceedings of the European Commission TIMODAZ-THERSA international conference, LuxembourgGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Federal Institute for Geosciences and Natural Resources (BGR)HanoverGermany
  2. 2.Helmholtz Centre for Environmental Research (UFZ)LeipzigGermany
  3. 3.Technical University of DresdenDresdenGermany

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