[Back]

Ch. Hellmich, F.-J Ulm, H.A. Mang:
"Chemoplasticity for Shotcrete at Early Ages";
in: "Proceedings of the 5th International Conference on Computational Plasticity. Fundamentals and Applications (COMPLAS V)", D.R.J. Owen, E. Onate, E. Hinton (ed.); CIMNE, Barcelona, Spain, 1997, 1499 - 1507.

Apart from other applications shotcrete plays a dominant role in the New Austrian Tunnelling Method (NATM). Modelling of the complex interaction between the tunnel shell and the surrounding ground required realistic constitutive models for both shotcrete and soil. To ensure the applicability of such material models, as few material parameters as possible should be involved. As for shotcrete, this is provided by extracting the intrinsic material behavior (i.e., the behavior independent of field or boundary conditions) from standard laboratory tests. The constitutive law is formulated within the framwork of thermodynamics of chemical reactive porous media, and treated algorithmically by means of a return mapping algorithmic. Finally, it is tested in a 2D study concerning the NATM.