Abstract
Geotechnical problems are characterized by the existence of a great variety of coupled processes and non-linear effects. To focus on problems arising in the field of radioactive waste disposal, the time-dependent behavior in underground excavations in low permeable materials is investigated. For this purpose model approaches for thermo-hydro-mechanical interactions in partially saturated porous media including thermal and moisture content dependent expansion have been developed and implemented into a finite element code. As coupling phenomena the Terzaghi’s effective stress concept and themass conservation of the liquid phase in a deformable porous media are considered. The resulting numerical model is verified with analytical solutions and validated with experimental data. An extension of this model is concerned with the non-linear structural behavior of low permeable material. For this, a purely mechanical model for various kinds of material is presented, which incorporates initial stresses. Finally, the long term behavior of an excavation is analyzed in detail and compared to the corresponding long term measurements of a mine-by experiment conducted in argillite at the Tournemire test site in France. Therefore damage, drying induced shrinkage and anisotropic deformation dependent permeability are considered.
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Maßmann, J., Ziefle, G., Kohlmeier, M., Zielke, W. (2011). Thermo-Hydro-Mechanical Modeling of Coupled Processes in Clay Materials. In: Stephan, E., Wriggers, P. (eds) Modelling, Simulation and Software Concepts for Scientific-Technological Problems. Lecture Notes in Applied and Computational Mechanics, vol 57. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-20490-6_2
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DOI: https://doi.org/10.1007/978-3-642-20490-6_2
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