ABSTRACT
In Gothenburg, the Swedish Transport Administration is currently building Sweden’s largest underground train stations in Haga and Korsvägen. One entrance will be located in the new building of the School of Business, Economics and Law (Handels) at the University of Gothenburg. Challenges include the proximity to tram lines, residential areas, libraries, and other facilities as well as ongoing classes close by. The excavation area is 52 x 22 meters and the depth is up to 18 meters in soil and 18 meters in rock. Excavation takes place within temporary sheet piles supported with struts and anchors. Since the area is considered sensitive to settlements this led to extensive pre-grouting of the rock as well as jet grouting of the transition between rock and soil at the bottom of the sheet piles. Design requirements stipulated vertical walls, the rock walls were prepared with pre-reinforcement and by wire cutting followed by careful blasting.
This paper highlights the technical challenges working together with hard rock engineering, soft soil engineering and hydrogeology.
