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The Feuerbach and Bad Cannstatt Tunnels on the Stuttgart 21 project are two central elements of the future Stuttgart inner‐city rail node. Due to the central location in the middle of Stuttgart, there are particular requirements for construction operations and logistics. These effects are additionally reinforced by the very difficult geological and geotechnical conditions in the valley of Stuttgart:...
Rocks containing clay and anhydrite exhibit the property of increasing their volume by absorbing water. The paper first discusses the mechanisms causing swelling and outlines their effects on tunnels. Next the hazard scenario of heaving of the tunnel tube as a whole, the structural consequences of this and the concept of the Modular Yielding System for tunnelling in stretches where heave is unavoidable...
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