Abstract
The Semmering Base Tunnel, a major railway tunnel project in Austria with a length of around 27.3 km was to be constructed through significant fault zones. The geotechnical parameters of the cataclasites especially in combination with high ground water pressure were of high importance for the geotechnical tunnel design. Advanced triaxial tests considering the ground water condition as well as the high primary stress level were performed to gain information about the behavior of the weak rock mass. The ground material tested in the triaxial test consists of highly crushed and faulted phyllites and schists and was explored during the ground investigations for the Semmering Base Tunnel project.
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