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Numerical Simulation in Tunnelling pp 61–81Cite as

Thermochemomechanical material model for shotcrete

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Abstract

Employing a thermodynamic framework, thermochemomechanical couplings for shotcrete are treated in this chapter. A material model based on multisurface thermochemoplasticity is presented. It accounts for hydration kinetics, chemomechanical couplings related to strength growth, stiffness properties, and to autogeneous shrinkage in early-age shotcrete. Creep is modeled by means of two mechanisms: stress-induced water movement in the capillary pores of shotcrete, and a relaxation mechanism in the nanopores of the cement gel. The underlying material functions are intrinsic, i.e., independent of field and boundary conditions. They are determined from standard material tests. As for the numerical treatment of the constitutive equations of the material model, an extended form of the return map algorithm is presented. Microcracking is considered by means of a Drucker-Prager failure surface for the compressive load regime and by means of Rankine surfaces for tensile brittle failure.

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Authors and Affiliations

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

    Christian Hellmich, Roman Lackner & Herbert Mang

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  1. Christian Hellmich
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  2. Roman Lackner
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  1. Institut für Baustatik, Technische Universität Graz, Graz, Austria

    Gernot Beer

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Hellmich, C., Lackner, R., Mang, H. (2003). Thermochemomechanical material model for shotcrete. In: Beer, G. (eds) Numerical Simulation in Tunnelling. Springer, Vienna. https://doi.org/10.1007/978-3-7091-6099-2_5

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  • DOI: https://doi.org/10.1007/978-3-7091-6099-2_5

  • Publisher Name: Springer, Vienna

  • Print ISBN: 978-3-7091-7221-6

  • Online ISBN: 978-3-7091-6099-2

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