ABSTRACT
The new underground railway station in Haga, Gothenburg, is located in an area with non-uniform geological conditions as it rests on both clay deposits and sound rock. The presence of lower and upper aquifer with significant water pressures requires particular care in handling overall uplift capacity. These complex hydrogeological conditions lead to a structural solution without intermediate expansion joints, characterized by a response similar to a single-span bridge analyzed via a 3D nonlinear finite-element model. This paper presents the main design challenges and solutions, also with a view on construction stages as Haga station is built partially in bottom-up and top-down due to limited logistic space and the need to minimize excavation times.
