ABSTRACT
The excavation in the lot named “Mules 2-3”, being the biggest construction lot of the BBT Italian side, has been done by the “traditional method”, which is including drill & blast and parts of consolidation & excavation under faulty zones. The works are related to the excavation and lining of the Access Gallery at the Trens Emergency Stop, Exploratory Tunnel, Main Tunnel south direction east and west tube and 19 Connecting Side Tunnels linking the two main tubes. In total ca.12 km. The use of Robodrill has improved the technologies adopted in order to fulfil the challenging needs of the job site. The paper will report about various data related to the production and costs in the different working sections, taking in account, for example, synthetic information about explosive consumption, drilling material, spritz beton and consequent lining concrete overconsumption.
