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A New Creep Law to Describe the Transient and Secondary Creep Phase

  • K. Salzer
  • H. Konietzky
  • R.-M. Günther
Conference paper
Part of the International Centre for Mechanical Sciences book series (CISM, volume 397)

Abstract

For stability analyses as well as for predictions of the future geomechanical behaviour of underground openings in salt rock strata, proper calculation tools are needed. Numerical calculation methods and material laws are required to describe the mechanical behaviour of salt. A proposed new material salt creep law describes the deformation-hardening behaviour of the transient creep phase, which gives a good description for a relatively short time after the excavation phase and can, by considering the recovery of the hardening, also be extended to the stationary creep phase, which is significant for long times after the creation of openings. The developed material law also includes inverse transient creep, which takes place during load reductions. This material law is used for the back-analysis of all common types of lab tests (compression, creep and relaxation) as well as for some field measurements. The material creep law was implemented into the ITASCA codes FLAC (ITASCA 1998) and FLAC3D (ITASCA 1997).

Keywords

Triaxial Test Secondary Creep Transient Creep Numerical Calculation Method Storage Cavern 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Literature

  1. HUNSCHE U., SCHULZE, O. (1995). Personnel communicationGoogle Scholar
  2. IfG (1992). Überprüfung vorhandener Modellvorstellungen zum Konvergenzverhalten und zur Standsicherheit komplexer Grubengebäude im Salzgestein. Forschungsvorhaben BMFT-FB/02 E 8161 6, IfG GmbH Leipzig, Januar 1992Google Scholar
  3. ITASCA Consulting Group, Inc. (1997). FLAC3D , Version 2.0, Minneapolis, Minnesota: ICGGoogle Scholar
  4. ITASCA Consulting Group, Inc. (1998). FLAC, Version 3.4, Minneapolis, Minnesota: ICGGoogle Scholar
  5. LEMATTRE J. (1970). Sur la determination des lois de compartement des materiaux, ela viscoplastiques, thesis, Public, O.N.E.R.A N° 135 81970), ParisGoogle Scholar
  6. MENZEL W., SCHREINER W. (1977). Zum geomechanischen Verhalten von Steinsalz verschiedener Lagerstätten der DDR. Teil II: Das Verformungsverhalten, Neue Bergbautechnik 5, 8: 565–571Google Scholar
  7. SALZER K., SCHREINER W. (1996): Long-term safety of salt mines in flat beddings. 4th Conference on the Mechanical Behavior of Salt, MontrealGoogle Scholar

Copyright information

© Springer-Verlag Wien 1998

Authors and Affiliations

  • K. Salzer
    • 1
  • H. Konietzky
    • 2
  • R.-M. Günther
    • 1
  1. 1.Institut für GebirgsmechanikLeipzigGermany
  2. 2.ITASCA Consultants GmbHGelsenkirchenGermany

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