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Tunnel Riedberg – A tunnel in a sliding slope The Riedberg Tunnel, part of the National Road A9 in the canton of Valais in Switzerland, presents special requirements due to its alignment through the active Riedberg landslide area. Managing the expected differential displacements and deformations along the tunnel was a focus of the planning process and required innovative technical solutions. An important component of the overall project is the monitoring of the slope and the structure, as well as understanding the slope behaviour, which also forms the basis for measures aimed at reducing sensitivity and stabilizing the slope's movement.
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Amberg et al. (2026) studied this question.
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