ABSTRACT

Stockholm bypass is the biggest infrastructure ever designed in the Nordics. The paper describes the most critical section, length 7 km, running below Lovön Island and Malaren lake, respectively a relevant natural reserve and Stockholm´s drinking water reservoir. The main challenge is minimizing the impact of mucking out the 9 million tons of rocks coming from the tunnels excavation. Strong focus is given to water protection. The systematic pre-grouting prevents any possible impact on the lake and the water table; wastewaters coming from the tunnels, from the rock materials stockpiling and from the equipment parking areas are kept separate, collected and diverted to avoid even the minimal contamination.