Effect of Deformation Zones on the State of In Situ Stress at a Candidate Site of Geological Repository of Nuclear Waste in Sweden

스웨덴 방사성 폐기물 처분장 후보부지의 사례를 통해 살펴본 대규모 변형대가 암반의 초기응력에 미치는 영향

  • Min, Ki-Bok (School of Civil, Environmental and Mining Engineering, University of Adelaide)
  • 민기복 (애들레이드 대학교 토목환경자원공학부)
  • Published : 2008.04.30


The state of in situ stress is an important factor in considering the suitability of a site as a geological repository for nuclear waste. In this study, three-dimensional distinct numerical analysis was conducted to investigate the effect of deformation zones on the state of stress in the Oskarshamn area, which is one of two candidate sites in Sweden. A discontinuum numerical model was constructed by explicitly representing the numerous deformation zones identified from site investigation and far-field tectonic stress was applied in the constructed model. The numerical model successfully captured the variation of measured stress often observed in the rock mass containing large-scale fractures, which shows that numerical analysis can be an effective tool in improving the understanding of the state of stresses. Discrepancies between measured and modelled stress are attributed to the inconsistent quality of measured stress, uncertainty in geological geometry. and input data for fractures.


In situ stress;Deformation zone;Distinct element method;Geological repository of nuclear waste disposal


  1. Hakala, M., J.A. Hudson and R. Christiansson, 2003, Quality control of overcoring stress measurement data, Int. J. Rock Mech. Min. Sci. 40(7-8), 1141-1159 https://doi.org/10.1016/j.ijrmms.2003.07.005
  2. Hakami, E., H. Hakami and R. Christiansson, 2006, Depicting a plausible in situ stress distribution by numerical analysis - examples from two candidate sites in Sweden, In: Lu, Li, Kjorholt & Dahle (eds), In situ Rock Stress, Trondheim, Norway, 473-481
  3. Homberg, C., J.C. Hu, J. Angelier, F. Bergerat and O. lacombe, 1997, Characterization of stress perturbations near major fault zones: insights from 2-D distinct-element numerical modeling and field studies (Jura mountains), J. Structural Geology, 19(5), 703-718 https://doi.org/10.1016/S0191-8141(96)00104-6
  4. Itasca Consulting Group Inc., 2003, Three Dimensional Distinct Element Code - User's Guide, Minneapolis, Minnesota, USA
  5. Min, K.B., C.I. Lee and H.M. Choi, 2003, An experimental and numerical study of the in-situ stress measurement on transversely isotropic rock by overcoring method, In: Sugawara K et al (eds), 3rd International Symposium on Rock Stress - RS Kumamoto '03, Kumamoto, 189-195
  6. SKB, 2007, Forsmark site investigation, Programme for long-term observations of geosphere and biosphere after completed site investigations, Svensk Karnbranslehantering AB, SKB R-07-34
  7. Su, S and O. Stephansson, 1999, Effect of a fault on in situ stresses studied by the distinct element method, Int. J. Rock Mech. Min. Sci. 36(8), 1051-1056 https://doi.org/10.1016/S1365-1609(99)00119-7
  8. Hart, R., 2003, Enhancing rock stress understanding through numerical analysis Int. J. Rock Mech. Min. Sci. 40(7-8),1089-1097 https://doi.org/10.1016/S1365-1609(03)00116-3
  9. SKB, 2006, Preliminary Site description. Laxemar area - version 1.2, Svensk Karnbranslehantering AB, SKB R-06-10
  10. Hudson, J.A. and F.H. Cornet, 2003, Special issue on rock stress estimation, Int. J. Rock Mech. Min. Sci. 40(7-8), 955 https://doi.org/10.1016/j.ijrmms.2003.08.001
  11. Pollard, D.D. and P. Segall, 1987, Theoretical displacements and stresses near fractures in rock: with applications to faults, joints, veins, dikes, and solution surfaces, In: Atkinson B.K. (editor), Fracture mechanics of rock, Academic Press Inc, London, 277-349
  12. Fairhurst, C., 2003, Stress estimation in rock: a brief history and review, Int. J. Rock Mech. Min. Sci. 40 (7-8), 957-973 https://doi.org/10.1016/j.ijrmms.2003.07.002
  13. Homand, F., M. Souley, P. Gaviglio and I. Mamane, 1997, Modelling natural stresses in the Arc Syncline and comparison with in situ measurements, Int. J. Rock Mech. Min. Sci. 34(7), 1091-1107 https://doi.org/10.1016/S0148-9062(96)00064-2
  14. Bandis, S.C., A.C. Lumsden and N.R. Barton, 1983, Fundamentals of rock joint deformation, Int. J. Rock Mech. Min. Sci. & Geomech. Abstr. 20(6), 249-268 https://doi.org/10.1016/0148-9062(83)90595-8
  15. Amadei, B. and O. Stephansson, 1997, Rock stress and its measurement, Chapman and Hall, London, 490p
  16. SKB, 2007, RD&D Programme 2007, Programme for research, development and demonstration of methods for the management and disposal of nuclear waste, Svensk Karnbranslehantering AB, SKB TR-07-12
  17. Hakami, E., H. Hakami and J. Cosgrove, 2002, Strategy for a Rock Mechanics Site Descriptive Model-Development and testing of an approach to modelling the state of stress, Svensk Karnbranslehantering AB, SKB R-02-03
  18. Martin, C.D. and N.A. Chandler, 1993, Stress heterogeneity and Geological structures, Int. J. Rock Mech. Min. Sci. 30(7), 993-999 https://doi.org/10.1016/0148-9062(93)90059-M
  19. Brady, B.H.G., J.V. Lemos and P.A. Cundall, 1986, Stress measurement schemes for jointed and fractured rock, In: Stephansson O. (ed), Rock stress and rock stress measurement, Lulea, Sweden, 167-176
  20. SKB, 2004, Preliminary site description, Simpevarp area - version 1.1, Svensk Karnbranslehantering AB, SKB R-04-25