Work in progress at Tunnel T1 in Djebel El Ouahch, Algeria

At the moment, the works in the tunnel of Djebel El Ouahch include the excavation of the lower part of the tunnel and the execution of the final reverse arch in sector n° 97. This section of the tunnel is very delicate due to the presence of a cross passage (CP3) to the right carriageway (direction Algiers).
Before the excavation was executed, consolidation work was carried out on the lowering piers to minimise both subsidence and convergence, with cement injections and pairs of micropiles.
The excavation full section is over 200 square meters.
To date, work is proceeding with minimal deformation of the tunnel.

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