Geotechnical characteristics of soft rocks of the Inneralpine Molasse – Brenner Base Tunnel access route, Unterangerberg, Tyrol, Austria

The engineering geological investigation for the environmental impact assessment of the more than 20 km long route section Schaftenau–Radfeld in the Lower Inn Valley (Tyrol) was conducted in 2017/18. As a central structure, a nearly 3 km long tunnel will be built through the Unterangerberg. The bedr...

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Bibliographic Details
Published in:Geomechanik und Tunnelbau 2019-12, Vol.12 (6), p.716-720
Main Authors: Erharter, Georg H., Poscher, Gerhard, Sommer, Peter, Sedlacek, Christoph
Format: Article
Language:English
Subjects:
Access routes
Baugrunderkundung
Bedrock
Drilling
Engineering geology
Environmental assessment
Environmental impact
Environmental impact assessment
Felsmechanik
Geotechnical engineering
geotechnical investigation
hard soil‐soft rock
Ingenieurgeologie
Lithology
Marl
Mechanical properties
Reconnaissance
Rock masses
Rock mechanics
Rocks
Sandstone
Sedimentary rocks
Soil
Soil hardness
Tunnels
Turbidites
Unterangerberg formation
Weak rock
weathering
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Summary:The engineering geological investigation for the environmental impact assessment of the more than 20 km long route section Schaftenau–Radfeld in the Lower Inn Valley (Tyrol) was conducted in 2017/18. As a central structure, a nearly 3 km long tunnel will be built through the Unterangerberg. The bedrock of the Unterangerberg consists of turbiditic, marine deposits of the Inneralpine Molasse with interbedded layers of marl, claystone and sandstone. The proximity to the Inntal shearzone and exogeneous effects like several glaciations have softened the surface of the inherently weak bedrock and led to heterogeneous mechanical properties. The monotonous lithology is therefore accompanied by an inhomogeneous rock mass characterization. This paper describes experiences of the geotechnical investigation of this weak rock. It was observed that only a quick transport of samples from the drilling site to the laboratory can guarantee for test results in accordance with the standards. The results, lying in the transitional zone between soft rock and hard soil, are in good accordance with data from other studies.
ISSN:1865-7362
1865-7389
DOI:10.1002/geot.201900048