This paper provides an overview on the studies carried out during the preparation of Lyon-Turin high speed railway link detailed design on the proposed mixed shield TBM excavation for approx. 9 out of the 12 km section of the Italian part base tunnel. Different geological formations and geomechanical conditions are expected to be encountered, including faults, high overburden, hard and highly fractured rocks as well as loose permeable soils with high water pressures. An overview on calculations of critical sections and TBM specifications is provided.
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