civil engineering 19 saint-martin-la-porte exploratory tunnel savoie telt access gallery at saint-martin-la-porte mobilizing all of our expertise at saint-martin-la-porte spie batignolles tpci is coordinating a complex underground operation in a rock mass exhibiting severe squeezing behaviour launched in early 2015 the saint-martin-la-porte exploratory tunnel project marks a new phase in the construction of the 57 km rail tunnel between france and italy the cross-border segment of the future lyon-turin rail link will pass through the new tunnel which will be one of the longest in the world for this project spie batignolles tpci has been assigned the task of digging a 9 km exploratory tunnel using a tunnel boring machine tbm part of the tunnel lies between two rock formations composed of schists shales sandstones and coal seams coal face this geological formation makes the work particularly complicated to avoid this section an additional 1.8 km access gallery will have to be excavated using traditional method i.e drill and blast at the bottom of this gallery the teams will traverse the coal face by digging a second 1.4 km exploratory tunnel enabling the geotechnical data from this section to be consolidated the operation requires advanced environmental measures relocation of protected species recycling of wastewater and spoil 9 km of tunnel to be dug 1 130m hard rock tbm boring 1 lining segments factory managed by spie batignolles tpci over 52,400 lining segments to be produced 1.3 million m 3 of excavated material innovation increasing role of digital technology increasing use is being made of digital technology in civil engineering as well as other branches of the building industry both in the preparatory stages technical studies financing arrangements etc and during the work on-site connected technology in 2015 spie batignolles tpci upgraded the design phase of its projects by introducing bim building information modeling software this technology upgrade has had a significant impact on the work itself with the possibility of monitoring work progress in real time and coordinating the machines in accordance with the images transmitted
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