Detailed design of Costal del Sol Railway Corridor. Section: San Pedro de Alcántara-Estepona
The tunnels referred to in this project are included in the railway line section San Pedro de Alcántara – Estepona.
The project is divided into four sub-sections:
- San Pedro de Alcántara-Benamara-Cancelada (two-tube tunnel)
- Cancelada-Estepona (two-tube tunnel)
- Estepona-Pozo Hauling shaft (single-tube tunnel)
- Estepona-Train Depot (mine)
The two-tube tunnel runs from San Pedro de Alcántara Station to Estepona Station, with a length of 13,375 m. The single-tube tunnel goes from Estepona Station to Pozo de Extracción (hauling shaft), with a length of 1,700 m. Finally, the cut-and-cover tunnel is 475 m long.
The tunnel route traverses the following geological units: Upper Bizcornil and Lower Bizcornil (arenite), Migmatite, Turbidite and Flysh.
The need for a stable excavation and a waterproof tunnel lining, along with other factors such as the crossing of several rivers along the route, determined the simultaneous excavation and construction of this tunnel section by using a EPB tunnel machine