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Semmering Base Tunnel – Design and construction of the shaft head caverns under difficult conditions
Author(s) -
Wieland Gerd,
Prall Karoline,
Lenz Gerold,
Schachinger Tobias,
Gobiet Gerhard
Publication year - 2018
Publication title -
geomechanics and tunnelling
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.317
H-Index - 18
eISSN - 1865-7389
pISSN - 1865-7362
DOI - 10.1002/geot.201800040
Subject(s) - head (geology) , excavation , point (geometry) , base (topology) , fault (geology) , track (disk drive) , engineering , mining engineering , geology , geotechnical engineering , mechanical engineering , mathematical analysis , geometry , mathematics , geomorphology , seismology
In contract SBT1.1 of the Semmering Base Tunnel, the single‐track main tunnels are being driven from the portal in Gloggnitz and from a temporary intermediate starting point in Göstritz. The temporary intermediate starting point in Göstritz is being constructed in order to reduce the risk to the tunnel construction time for the Graßberg‐Schlagl fault system. During the construction phase, the contractor developed optimisations of the planned logistics concept for the intermediate access point in Göstritz, which led to a redesign of the shaft head cavern system. Shortly before the excavation of the shaft head cavern, an unexpected and geotechnically relevant fault zone was encountered in the access tunnel. In order to investigate the geological situation in the area of the shaft head, extensive additional investigation measures were carried out. Due to the updated geological forecast, the layout of the shaft head cavern and the support concept had to be changed. Thanks to the measures taken, the shaft head cavern system cold be successfully excavate without any damage to the support.