THE BIM APPROACH FOR TUNNEL LININGS

In conventional tunneling, the site geology and excavation behavior allow to define the most appropriate excavation method and techniques needed during the construction phases. Because of the uncertainties regarding site geology and soil, the project design demands a specific organization and tools. The rise of Building Information Modelling (BIM) represents a major opportunity for tunnel engineering and public organizations to manage projects and improve the efficiency of all services. Given the importance of the project, its strategic role, and its critical position, TELT sets forward the BIM process to ensure the efficiency of the design, and organization of information flows. This thesis focuses on the BIM application on construction sites 6 and 7 (CO6 and CO07) of the new Tunnel Euralpin Lyon Turin (TELT) project. A database has been created for all the structures of the project (supporting structures of the tunnel portal, conventional tunnel primary support, pre-support, and final lining). All the components are fully modeled in BIM, according to the client's specifications and requirements. Different 3D models have also been implemented to have a clear dynamic vision of the geological sequence in all parts of the tunnel alignment, to characterize the technical uncertainties at the tunnel face during construction, and to allow the client to adapt its methods and support section. Dynamic 4D and 5D models are developed as well, this will permit the contractors to efficiently follow and adapt the construction works and methods on site.