ABSTRACT
The Brenner Base Tunnel will be the world’s longest tunnel with a total length of 64 km. The tunnel system of the Brenner Base Tunnel consists of several tunnels; it is therefore of crucial importance to consider how the single tunnels act together during and after their construction. In order to evaluate these interaction effects, several 3D finite element calculations with advanced non-linear material laws were carried out, which are illustrated in the contribution. The determination of the material parameters for the used material laws for the rock mass and concrete is described and the finite element model including the concrete shells is explained. The calculations show that advanced material models are appropriate and loading/unloading effects can be simulated realistically. The calculations show further that the influence of the excavation to the concrete shells of the existing tunnel is quite relevant and appropriate measures must be taken to avoid risks of damage.
