Charakterisierung der ingenieurgeologischen Vortriebsdokumentation von Hydroschildvortrieben am Beispiel der Baulose H3-4 und H8 im Unterinntal

Characterisation of engineering geological documentation of slurry shield drives - practical experience from construction lots H3-4 und H8 in the Lower Inn Valley.

The engineering geological documentation of slurry shield drives is limited due to adverse accessibility of the tunnel face during a slurry shield drive. Due to this reason, an extensive geological documentation was rather an exception than default in the past. A detailed engineering geological documentation has been established during two slurry shield drives in Tyrol/Austria, which showed that geological documentation is possible and contributes well to supporting the site management. The documentation comprises two parts: the indirect documentation of the excavated material and the direct documentation of the tunnel face under hyperbaric air support during maintenance interruptions. Combining the results of indirect and direct documentation leads to a complete and detailed picture of the geological conditions. Therefore it will become possible to compare the prognosis to the encountered condition. Furthermore profound consideration of geological aspects leads to a better understanding of interactions between building ground and slurry shield drive.