On the Fracture Behavior of Rock Salt

  • U. Hunsche
Chapter
Part of the Mechanical Behavior of Materials book series (MBOM, volume 2)

Abstract

Research is conducted by the BGR on the creep and failure of natural salt rock in order to describe its thermomechanical behavior. A true triaxial test rig for cubic samples has been used for 240 tests on 8 different types of rock salt. The effects of varying mean stress, load geometry, and temperature on failure strength and residual strength are determined in load-controlled quasi-static tests. A failure criterion in the sense of a conservative stability limit has been developed to describe the influence of the above-mentioned variables on strength and residual strength of rock salt of the Gorleben salt dome. Distinct differences in strength exist between the rock salt types. Moreover, thin anhydrite layers slightly increase strength. Fracture patterns, i.e. angles and width of fracture planes, and sample damage correlate with load geometry.

Keywords

Stability Limit Triaxial Test Residual Strength Rock Salt Fracture Plane 
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References

  1. 1.
    H. Albrecht and U. Hunsche, Fortschr. Miner. 58 (1980) 212–247.Google Scholar
  2. 2.
    U. Hunsche, in The Mechanical Behavior of Salt, Trans Tech Publications, Clausthal (1984) 159–167.Google Scholar
  3. 3.
    N. Diekmann, U. Hunsche and D. Meister, Z. dt. geol. Ges. 137 (1986) 29–56.Google Scholar
  4. 4.
    U. Hunsche and H. Albrecht, Engineering Fracture Mechanics (1989) (in press).Google Scholar
  5. 5.
    S. Serata, S. Sakurai and T. Adachi, in Basic and Applied Rock Mechanics, The Am. Inst. Mining, Metallurgical Engineers Inc., N.Y. (1972) 431–473.Google Scholar
  6. 6.
    U. Hunsche, in The Mechanical Behavior of Salt, Trans Tech Publications, Clausthal (1984) 169–179.Google Scholar
  7. 7.
    M. S. Patterson, Experimental Rock Deformation-The Brittle Field, Springer-Verlag, Berlin (1978) 40–41.Google Scholar
  8. 8.
    M. Wallner, Proc. of Waste Management 86, V.II, Tucson (1986) 145–151.Google Scholar
  9. 9.
    W. Menzel and W. Schreiner, Neue Bergbautechnik 5 (1975) 669–676.Google Scholar
  10. 10.
    F. D. Hansen, K. D. Mellegard and P. E. Senseny, in The Mechanical Behavior of Salt, Trans Tech Publications, Clausthal (1984) 71–83.Google Scholar
  11. 11.
    M. Wallner, Proc. 5th Int. Congr. on Rock Mechanics, Melbourne 1983, V.II, Rotterdam (1983) D9–D15.Google Scholar
  12. 12.
    O. C. Zienkiewicz and G. N. Pande, in Finite Elements in Geomechanics, John Wiley & Sons, London (1977) 179–190.Google Scholar
  13. 13.
    W. F. Brace, in State of Stress in the Earth’s Crust, Proc. of the Int. Conf., Santa Monica (USA) 1963, American Elsevier, N.Y. (1964) 111–178.Google Scholar

Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • U. Hunsche
    • 1
  1. 1.Federal Institute for Geosciences and Natural Resources (BGR)HannoverGermany

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