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  Arch shaped cut-and-cover tunnels on the new “Pedemontana Lombarda” motorway

  An innovative prefabrication method has been successfully employed for the construction of arch-shaped cut and cover tunnels on the new “Pedelombarda” motorway. The tunnels consist of prefabricated components resting on a cast-in-place invert. This solution has been employed with span widths varying from 14 m to 19 m and overburdens from a minimum of 1 m up to 8-9 m. Particular attention was paid to the backfilling stages, in order to define the geotechnical properties of the soil used for lateral and top backfilling. The high percentage of prefabrication in the solution adopted allowed high production rates to be maintained and also the use of high visual quality prefabricated concrete. After a detailed description of the construction system, this paper looks at the analyses performed in the design stage and the results of monitoring conducted during the testing of the works compared to design predictions.

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