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THE GOTTHARD BASE TUNNEL - TRANCHE 553

This required excavation of 820 m of loose material for the twin-tube tunnels in the Bodio section of the Gotthard Base Tunnel.

The two tunnels run through a cone of debris formed by loose material and blocks. The heterogeneity of the strata made it necessary to perform extensive consolidation works prior to excavation. Mechanical excavation of the arch required the assistance of protective measures such as forepoling and fibreglass anchors with ribs and shotcrete, prior to excavation of the tunnel itself.