Construction shaft of the Koralm Tunnel lot KAT 2 - a challenge in structural analysis, geotechnics and logistics / Der Bauschacht des Koralmtunnels Baulos KAT 2 - eine statische, geotechnische und logistische Herausforderung

The paper deals with the challenge on structural analysis, logistics as well as on geotechnical aspects during sinking of an approximately 60 m deep construction shaft with a cross-sectional area of about 720 m² at the Koralm Tunnel lot KAT 2. Numerical 3D simulations were used for the structural analysis. The results in terms of level of loading of the support measures and the displacements served as a basis for predicting the system behaviour of the shaft. During sinking, the behaviour of the shaft and surface was continuously monitored within the geotechnical safety management by means of 3D displacement measurements, measurement of strains in the shotcrete lining and measurements of pile inclinometers. Thereby a continuous target-performance comparison was accomplished. Special characteristics in the design and construction phase are illustrated and discussed.