Shotcrete use in the Southern Link tunnel, Stockholm

摘要

The Southern Link is a large road tunnel project to the south of Stockholm. This project includes tunnels with imposing dimensions constructed by a drill and blast method through hard rock. Steel Fibre Reinforced Shotcrete (SFRS) and bolts were used as primary rock support. The performance requirements for the shotcrete were very stringent with respect to strength, durability, and environmental considerations. In order to find a mix design that could satisfy these requirements, several pre-construction trials were carried out. To date, approximately 60% of the shotcrete work has successfully been completed. Due to blasting, shotcreting could not take place closer than 50 metres from working face. To determine the effect of peak particle velocities arising from the blasting, a test program was carried out. Results from these tests showed that blasting-induced vibrations decline very quickly with distance from the face.