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  Haga Station and Quick Clay of the West Link Project in Gothenburg - Geotechnical

  Haga Station is part of the West Link Project in Gothenburg, which is one of Sweden’s largest and most complex rail projects. Part of the station is located in glaciomarine clays deposits with an estimated depth of 45-50 m, covered by filling consisting of gravel and sand with a thickness between 1 and 5 m and separated from the bedrock by a friction soil layer with thickness ranging between 0.5 to 15 m. The paper presents the characteristics of this sensitive clay by means of several tests, describing in detail the physical and mechanical properties. Specific soil models to be used for calculations by FEM analyses are also presented, both in undrained and drained conditions such as the NGIADP model and the Soft Soil Model. The models are calibrated based on experimental data coming from field and laboratory investigations performed in the Haga station area; specific simulations of the laboratory tests by means of the Plaxis “Soil Test” tool are performed too, so to refine the soil models. Finally, the design approach to be used to manage deep excavation in quick clay is defined, outlining the most suitable interventions to be used to avoid negative impact on the surrounding area.

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