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  Back-analysis on Saint Martin la Porte works of Lyon- Turin base tunnel

  The excavation of exploratory works of the Saint-Martin-la-Porte of the future Lyon-Turin railway line have highlighted the squeezing behaviour of carbonaceous shales of the « Houiller », with large convergences which continued far from the tunnel face, highlighting the time-dependent behaviour of this rock mass. The design of the excavation method, of the supports to be put in place and of the final lining thus represents a major challenge for this sector of the project. This paper presents a back-analysis methodology, based on semi-empirical, analytical and numerical approaches, carried out on the available in situ data. This back-analysis study led to define a rheological model allowing the description of the mechanical and time-dependent behaviour of the « Houiller ». This methodology, fairly easy to use for the engineer, permit to define the design solutions for the North tube and the observational criteria to choose the constructive solutions during the works phase.

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