ABSTRACT
In conventional tunnelling, geology and excavation behaviour allow to define the most appropriate excavation method and support sections needed during the construction phases. Because of the uncertainties on the real on-site geological conditions and soil behaviour, the design and project execution stages demand flexible organization and tools. The rapid rise of Building Information Modelling (BIM) represents a major opportunity for tunnel engineering, construction industry and public organizations to improve quality and efficiency of all services. Given the size of the project, its heterogeneity, strategic role, and sustainability, TELT puts forward the fully BIM approach to ensure the efficiency of the design, organization of information flows.
This paper focuses on the BIM application on the construction site 8 (CO08) of the Tunnel Euralpin Lyon Turin (TELT) project. The project is implemented by the Contractors’ JV IMPLENIA FRANCE/NGE GC/ITINERA/RIZZANI De ECCHER and the design JV PINI France and Systra-SWS. The DAUB recommendation for BIM in tunnelling is applied. A database is created for all the structures and part of 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 modelled in BIM, according to the TELT technical specifications and requirements. A 3D geological model has also been implemented in order to have a dynamic comprehension of the geological sequence in all part of the tunnel alignment, to characterize the geological/geotechnical conditions and uncertainties at the tunnel face during construction, and to allow the Contractor to adapt its methods and support section.
Dynamic 4D and 5D models are developed. This will permit the Contractors to efficiently follow and adapt the construction works and methods on site.
