In this paper, a material model for the numerical simulation of cracking of shotcrete is pre- sented. Cracking is described by means of a multi-surface chemoplasticity model formulated in the framework of thermodynamics of chemical reactive porous media. The material…
In this paper, a material model for the numerical simulation of cracking of shotcrete is pre- sented. Cracking is described by means of a multi-surface chemoplasticity model formulated in the framework of thermodynamics of chemical reactive porous media. The material model is calibrated by means of the frac- ture energy concept. This concept is extended towards chemoplasticity accounting for early-age cracking of shotcrete and towards consideration of interaction between shotcrete and the reinforcement. The applicability of the material model is demonstrated by means of a numerical analysis of a shotcrete tunnel shell of the Sieberg tunnel, Lower Austria. For this purpose, a hybrid method proposed by (Rokahr & Zachow 1997) is reformu- lated. The term "hybrid" refers to the combination of in situ displacement measurements and a material model for shotcrete. The amount of cracking in the shotcrete shell is investigated. From the obtained stress state, a "level of loading" is computed serving as safety measure of the shell.