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Lot KAT1 consists of the realisation of 2 approx. 2250m long tubes with 4 cross passages, several artificial buildings near the portal area and constructions on the open section.
The twin tube of the Koralmtunnel is executed following NATM principles. Geological conditions are schluff, siltstone and sandstone.
Near the east portal a critical zone with only 4.5m overburden came across. A further critical area goes under fish ponds and a local road within an overburden of approx. 7m.
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