Abstract:
The Gothenburg Port Line is one of Sweden's most important railway links. The track makes it possible for freight traffic from across the Nordic region to reach the harbor districts in Gothenburg. The almost 10 km line is today a single-track line with too low of a standard to meet future traffic needs. An expansion to double-track is required in order to increase both the amount of rail traffic and the total amount of freight traffic. The project consists of several sections that will be carried out during different periods: Pö lsebo– Skandiahamnen, Eriksberg– Pö lsebo and Kville bangå rd. This study case focuses on the middle section Eriksberg– Pö lsebo. The new double track in this section covers approximately 1.2 km long tunnel in rock and soil. The rock generally consisting of crystalline rock while the soil is mainly sands/coarse sands, some parts present a thick layer of clay on top of the sands. The location of the tunnel will be adapted to the terrain so that as much of the tunnel as possible will be constructed through rock. This will primarily be the case through a hill in Bratterå s (100 m) and under a hill in Krokä ng (200 m). The middle section of the track will consist of a concrete tunnels that unites both rock tunnels. The rest of the stretches consist of small concrete tunnels and open rock cuts. Urban centers with houses, schools and nature areas characterize the area surrounding the planned tunnel. During construction of the new tunnel, careful consideration will be given to the nature areas in the district, which lie above the rock tunnels. Rail traffic will run as usual while the tunnel work is in progress. Production at the Eriksberg– Pö lsebo stretch is currently planned for 2019-2023. This article describes the project and challenges coupled to execution of the grouting design where the environmental requirements are as low as 5 L/min per 100 m (groundwater inflow into the tunnel), and how these requirements are met. Keywords: Grouting, Tunnelling, Crystalline rock