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Graebnertunnel Westroehre
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| Service: | NATM Excavation and Support Design
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| Estimated cost: | Commencement: | July 01, 2001
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Completion date: | October 01, 2003
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| Location: | Carinthia Austria |
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| Technical data: | Two Lane Highway Tunnel Length: 7,047 ft (2,1km); Height: ~35 ft x ~29 ft; Section: ~840 ft2 (78.4m2) Excavation included 4 vehicular cross passages connecting existing east tunnel. Constructed using two headings from North (drill-blast) and South (mined-excavator); Grouted pipe arch for pre-support and rock anchors where needed. |
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| Geology description: | Difficult tunneling conditions as result of the presence of the Lavantal fault, un-favorable bedding and severe jointing of gneiss and mica schists. |
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| Bid cost: | Final cost: | $38,000,000
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