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Kortazar tunnel. Vitoria-Bilbao-San Sebastián High Speed Line

Date 02/01/2019
Type of works Railway, Tunnels

Project description

The Kortazar tunnel is located within the Mondragón - Elorrio - Bergara section, Sector 3, of the Vitoria-Bilbao-San Sebastián High Speed Line. The route runs from West to East and passes through the municipalities of Elorrio (Bizkaia) and Bergara (Gipuzkoa). The total length of the section is 2.82 km (equivalent double track) and it is designed for a maximum speed of 220 km/h and a minimum speed of 90 km/h.

The section is one of the three into which the Mondragón - Elorrio - Bergara complex has been divided, and the tunnel and its evacuation gallery to the outside, two viaducts and a pile wall in the tunnel mouth are planned along the section. The excavation has been carried out in phases, given the section and type of terrain crossed by the tunnel. In this way, the stability of the tunnel is favoured and, in addition, the execution times are shortened and less powerful and more economical machinery can be used. These phases are "Advance" and "Breakthrough". The geometric characteristics of the excavation section of the Kortazar Tunnel are as follows:
  • Tunnel length: 1901.60 m.
  • Average excavation width: 14 m.
  • Excavation height of the vault section: 6 m.
  • Middle section of excavation in progress: 63 m2.
  • Excavation height in bench: 3.20 m.
  • Medium section of excavation in bench: 45 m2

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