The Ursulaberg tunnel in Pfullingen/Germany is constructed as an open cut in a sensitive weathered Middle Jurassic side-hill. The use of the observational method was not planned originally, but it proved to be very useful after unexpected deformations of the deep anchor wall were recorded. Owing to additional measurements, a satisfying mechanical model could be established, by which the deformations endangering serviceability and for the design of temporary struts were evaluated.
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