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The twin‐tube Koralm Tunnel with a length of about 32.9 km is the key structure on the new high‐speed line between Graz and Klagenfurt. The Koralm Tunnel passes through the mountain massif of the Koralpe with a maximum overburden of about 1,200 m. The two tunnel bores have a standard inner radius of 3.95 m and run at a spacing of about 40 m, connected by cross‐passages every 500 m. In the middle of...
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