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  High Speed Railway Milan – Genoa, Parametric analysis of rock stress-strain control during tunnel excavation in the Argille a Palombini formation

  The Stretch of the Italian high speed railway between Milan and Genoa is currently under construction and will be completed by 2021 with more than 85 km of tunnels. More than 60 % of the tunnel excavation will be realized in the “Argille a Palombini” formation (aP), characterized by an alternation of claystone schists with limestone lenses, highly tectonized and squeezing. The paper describes the experience gained in the full face excavation of more than 10 km of tunnel in the aP, with overburden ranging from 5 to 600 m, extreme variability of rock mass quality and tunnel sections. Excavation data are collected by an extensive monitoring system and they are compared with design forecast and interpreted by back analysis models.

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