Tunnel Harka

 

Tunnel Harka

Hydro-technical tunnel Harka located in the northern region Sejnane Tunisia, about 100 km west of the capital Tunisa.Hidrotehnički Harka tunnel is located in the water supply system of the northern part of the country (the system of dams and reservoirs associated pipelines and tunnels for water transfer). The purpose of hydropower tunnel Harka is to translate the water from the reservoir Harka Sejnane accumulation, and thus to provide sufficient water for water supply in the region of northern Tunisia.

The total tunnel length is 1 570 meters. The cross section is circular with a diameter of 2.40 m thick concrete lining 40cm.
The route of the tunnel passes through adverse geological terrain (marly shale) with a high level of groundwater. Excavation of tunnels running through the machine with partial use of explosives. Along the route there are significant leakage, which causes rapid response and works to protect iskopa.Iskop is performed in stages so that after excavation of some sections and is set remenata protection dug through concrete torkret different thickness.

Concreting secondary lining is performed, also in phases, after the excavation and protection of the excavation. Sheeting used for concreting the system type.

Works commenced in mid 2008 and completion is planned for the end of 2011.