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Short-term creep of shotcrete - thermochemoplastic material modelling and nonlinear analysis of a laboratory test and of a NATM excavation by the Finite Element Method

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Continuous and Discontinuous Modelling of Cohesive-Frictional Materials

Part of the book series: Lecture Notes in Physics ((LNP,volume 568))

Abstract

Embedded in a thermochemoplastic material law set up in the framework of thermodynamics, the focus of the work is on the creep characteristics of shotcrete. Short-term creep, with a characteristic duration of several days, turns out to be a fundamental feature for realistic modelling of the structural behaviour of tunnels driven according to the New Austrian Tunnelling Method (NATM). Its origin is a stressinduced water movement within the capillary pores of concrete. This process is related to the accumulation of hydrates, which are initially free of micro-stress. Hence, an incremental formulation for aging viscoelasticity turns out to be a proper tool for modelling this kind of creep. The usefulness of this formulation is tested by re-analyzing a relaxation test with non-constant prescribed strains, showing quantitatively correct results for concrete and qualitatively correct results for shotcrete. The latter results indicate the necessity of classical creep tests for shotcrete.

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Author information

Authors and Affiliations

  1. Institute for Strength of Materials, Vienna University of Technology, Karlsplatz 13, Vienna, Austria

    M. Lechner, Ch. Hellmich & H. A. Mang

Authors
  1. M. Lechner
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  2. Ch. Hellmich
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  3. H. A. Mang
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Editor information

Editors and Affiliations

  1. Institute of Geotechnical Engineering, University of Stuttgart, Pfaffenwaldring 35, 70569, Stuttgart, Germany

    Pieter A. Vermeer

  2. Institute of Computer Applications 1, University of Stuttgart, Pfaffenwaldring 27, 70569, Stuttgart, Germany

    Hans J. Herrmann  & Stefan Luding  & 

  3. Institute of Applied Mechanics, University of Stuttgart, Pfaffenwaldring 7, 70569, Stuttgart, Germany

    Wolfgang Ehlers  & Stefan Diebels  & 

  4. Institute of Structural Mechanics, University of Stuttgart, Pfaffenwaldring 27, 70569, Stuttgart, Germany

    Ekkehard Ramm

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© 2001 Springer-Verlag Berlin Heidelberg

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Lechner, M., Hellmich, C., Mang, H.A. (2001). Short-term creep of shotcrete - thermochemoplastic material modelling and nonlinear analysis of a laboratory test and of a NATM excavation by the Finite Element Method. In: Vermeer, P.A., Herrmann, H.J., Luding, S., Ehlers, W., Diebels, S., Ramm, E. (eds) Continuous and Discontinuous Modelling of Cohesive-Frictional Materials. Lecture Notes in Physics, vol 568. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-44424-6_4

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  • DOI: https://doi.org/10.1007/3-540-44424-6_4

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-41525-1

  • Online ISBN: 978-3-540-44424-4

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