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Abstract: The San Mamés tunnel was excavated in Bilbao (Bizkaia, the Basque Country), to improve the traffic management of the Spanish A8 motorway - named Autovia del Cantabrico- the main road in Northern Spain. The tunnel is placed under the city’s neighbourhood of Altamira.This tunnel is about 0.5 Km long with an operational section of 59.2m2, while the excavated section is 99,93m2. The geotechnical...