Bemessungsstrategien für Spritzbetonschalen

With the introduction of Eurocodes, non-linear methods are now explicitly permitted for the determination of internal forces. Although the application of Eurocode 7 has not been intended for tunnel construction, it is applied in practice. Tunnel linings are treated as retaining structures in the sense of Eurocode 7. The choice of the Design Approach to be applied is specified in the National Annex (NA) of each country. The application of a standard to a field which was not intended for the purpose naturally leaves room for diverse interpretation. A working group was established by the Austrian Society for Geomechanics (ÖGG) to develop a consistent design strategy for tunnelling. Recommendations based on comparative calculations have been developed for the design of sprayed concrete linings. This article summarises the findings of the investigations carried out.