Environmental Geology

, Volume 57, Issue 6, pp 1221–1237 | Cite as

DECOVALEX Project: from 1992 to 2007

  • Chin-Fu Tsang
  • Ove Stephansson
  • Lanru Jing
  • Fritz Kautsky
Special Issue

Abstract

The DECOVALEX project is a unique international research collaboration, initiated in 1992, for advancing the understanding and mathematical modelling of coupled thermo-hydro-mechanical (THM) and thermo-hydro-mechanical-chemical (THMC) processes in geological systems—subjects of importance for performance assessment of radioactive waste repositories in geological formations. From 1992 up to 2007, the project has made important progress and played a key role in the development of numerical modelling of coupled processes in fractured rocks and buffer/backfill materials. The project has been conducted by research teams supported by a large number of radioactive-waste-management organizations and regulatory authorities, including those of Canada, China, Finland, France, Japan, Germany, Spain, Sweden, UK, and the USA. Through this project, in-depth knowledge has been gained of coupled THM and THMC processes associated with nuclear waste repositories, as well as numerical simulation models for their quantitative analysis. The knowledge accumulated from this project, in the form of a large number of research reports and international journal and conference papers in the open literature, has been applied effectively in the implementation and review of national radioactive-waste-management programmes in the participating countries. This paper presents an overview of the project.

Keywords

Geoscience Quantitative Hydrogeology Waste Management 

Notes

Acknowledgments

The authors would like to express their sincere gratitude to all funding organizations of the DECOVALEX project (Table 1) for their financial and technical support, and to the experts and research teams for their extensive contributions and outstanding achievements that have made the project successful. Especially, we would like to thank the Swedish Nuclear Power Inspectorate (SKI, recently reorganized as the Swedish Radiation Safety Authority SSM) for their sustained support and encouragement throughout the 15 years of this most successful international cooperative project.

References

  1. Alonso EE, Alcoverro J et al (2005) The FEBEX benchmark test: case definition and comparison of modelling approaches. Int J Rock Mech Min Sci 42:611–638CrossRefGoogle Scholar
  2. Börgesson L, Chijimatsu M, Fujita T, Nguyen TS, Rutqvist J, Jing L (2001) Thermo-hydro-mechanical characterization of a bentonite-based buffer material by laboratory tests and numerical back analysis. Int J Rock Mech Min Sci 38(1):95–104CrossRefGoogle Scholar
  3. Chijimatsu M, Fujita T, Sugita Y, Amemiya K, Kobayashi A (2001) Field experiment, results and THM behaviour in the Kamaishi mine experiment. Int J Rock Mech Min Sci 38(1):67–78CrossRefGoogle Scholar
  4. Gens A (2003) The role of geotechnical engineering for nuclear utilization. In: Vanisek P et al (eds) Proceedings of the XIII ECSMGE, vol 3, Special Lecture 2, PragueGoogle Scholar
  5. Jing L, Tsang C-F, Stephansson O (1995) DECOVALEX—an international cooperative research project on mathematical models of coupled THM processes for safety analysis of radioactive waste repositories. Int J Rock Mech Min Sci 32:389–398CrossRefGoogle Scholar
  6. Jing L, Stephansson O, Tsang C-F, Kautsky F (1996) DECOVALEX—mathematical models of coupled T-H-M processes for nuclear waste repositories—executive summary of phase I, II and III. Swedish Nuclear Power Inspectorate SKI technical report 96, Stockholm, p58Google Scholar
  7. Jing L, Stephansson O, Tsang C-F, Knight JL, Kautsky F (1999) DECOVALEX II project—executive summary. Swedish Nuclear Power Inspectorate SKI report 99, Stockholm, p24Google Scholar
  8. Jing L, Tsang C-F, Mayor J-C, Stephansson O, Kautzky F (2005) DECOVALEX III project: mathematical models of coupled thermal-hydro-mechanical processes for nuclear waste repositories, executive summary. Swedish Nuclear Power Inspectorate SKI Report 2005, Stockholm, p 19Google Scholar
  9. Jing L, Kautsky F, Stephansson O, Tsang C-F (2008) DECOVALEX-THMC project, executive summary. Swedish Nuclear Power Inspectorate, StockholmGoogle Scholar
  10. Nguyen TS, Börgesson L, Chijimatsu M, Rutqvist J, Fujita T, hernelin J, Kobayashi A, Ohnishi Y, Tanaka M, Jing L (2001) Hydro-mechanical response of a fractured granitic rock mass to excavation of a test pit—the Kamaishi Mine experiment in Japan. Int J Rock Mech Min Sci 38(1):79–94CrossRefGoogle Scholar
  11. Nguyen TS, Selvadurai APS, Armand G (2005) Modeling the FEBEX THM experiment using a state surface approach. Int J Rock Mech Min Sci 42(5–6):639–651CrossRefGoogle Scholar
  12. Rejeb A, Cabrera JN (2007) Time-dependent evolution of the excavation damaged zone in the argillaceous Tournemire site. In: Xu W, Tan X, Yang S (eds) Advances on coupled thermo-hydro-mechanical-chemical processes in geosystems and engineering (Proc. Int. Conf. GeoProc 2006, Nanjing, China). Science Press, Beijing, pp 648–657Google Scholar
  13. Rejeb A, Millard A, Rouabhi A, Tijani M (2007) Modelling approaches of the excavation damaged zone (EDZ) around the old tunnel at the argillaceous Tournemire site. In: Xu W, Tan X, Yang S (eds) Advances on coupled thermo-hydro-mechanical-chemical processes in geosystems and engineering (Proc. Int. Conf. GeoProc 2006, Nanjing, China). Science Press, Beijing, pp 677–682Google Scholar
  14. Rutqvist J, Börgesson L, Chijimatsu M, Kobayashi A, Jing L, Nguyen TS, Noorishad J, Tsang C-F (2001a) Thermohydromechanics of partially saturated geological media: governing equations and formulation of four finite element models. Int J Rock Mech Min Sci 38(1):105–128CrossRefGoogle Scholar
  15. Rutqvist J, Börgesson L, Chijimatsu M, Nguyen TS, Jing L, Noorishad J, Tsang C-F (2001b) Coupled thermo-hydro-mechanical analysis of a heater tests in fractured rock and bentonite at Kamaishi Mine—comparison of field results to predictions of four finite element codes. Int J Rock Mech Min Sci 38(1):129–1142CrossRefGoogle Scholar
  16. Stephansson O, Jing L, Tsang C-F (1996) Coupled thermo-hydro-mechanical processes of fractured media—mathematical and experimental studies. In: Development in geotechnical engineering, vol 79. Elsevier, Amsterdam, 575pGoogle Scholar
  17. Stephansson O, Hudson JA, Jing L (eds) (2004) Coupled thermo-hydro-mechanical-chemical processes in geosystems: fundamentals, modelling, experiments and applications. Elsevier, Oxford, 831pGoogle Scholar
  18. Stephansson O, Hudson JA, Andersson J (2005) Guidance document on THM coupled processes in performance assessment (Benchpar). Contract No FIKW-CT-2000-00066. European Commission, Nuclear Science and Technology EUR 21226 EN, 41 pGoogle Scholar
  19. Tsang C-F (1987) Coupled processes associated with nuclear waste repositories. Academic, San Diego, 801pGoogle Scholar
  20. Tsang C-F, Stephansson O, Kautsky F, Jing L (2004) Coupled THM processes in geological systems and the DECOVALEX project. In: Stephansson O, Hudson JA, Jing L (eds) Coupled thermo-hydro-mechanical-chemical processes in geo-systems: fundamentals, modelling, experiments and applications. Elsevier, Oxford, pp 3–16CrossRefGoogle Scholar
  21. Xu W, Tan X, Yang S (2007) Advances on coupled thermo-hydro-mechanical-chemical processes in geosystems and engineering (Proc. Int. Conf. GeoProc 2006, Nanjing, China). Science Press, BeijingGoogle Scholar

Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Chin-Fu Tsang
    • 1
  • Ove Stephansson
    • 2
  • Lanru Jing
    • 3
  • Fritz Kautsky
    • 4
  1. 1.Lawrence Berkeley National LaboratoryBerkeleyUSA
  2. 2.GeoForschungsZentrumPotsdamGermany
  3. 3.Royal Institute of TechnologyStockholmSweden
  4. 4.Swedish Radiation Safety AuthorityStockholmSweden

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