Publication Abstract

Proceeding of the 2018 DFI-EFFC International Conference on Deep Foundations and Ground Improvement, Rome, Italy, (DFI, EFFC)

Keynote Lecture: The Sochi Case: The First Real Comparison Between NATM and ADECO-RS
G. Lunardi, CEO, G. Cassani, Technical Director, A. Bellocchio, Technical Manager

The main feature of the A.DE.CO-RS approach is that the design Engineer focuses primarily on the deformation response of the ground to the action of excavation. This deformation response is first analysed and predicted using a variety of instruments (full scale and laboratory tests, mathematical models), then it is controlled by using appropriate stabilisation measures. The A.DE.CO-RS approach investigates the deformation response very thoroughly, right from its onset where it starts ahead of the face, as opposed to traditional approaches, that only consider deformation behind the face. The approach controls the deformation response acting first and foremost ahead of the face, using preconfinement action, and not just ordinary confinement action as in traditional approaches. In this way the A.DE.CO-RS approach is able to successfully tackle any type of ground and stress-strain conditions, especially in the most difficult ones. The A.DE.CO-RS Approach has been applied in Italy, for the first time, in 1988 to Tasso Tunnel and then to San Vitale and Vasto tunnels. The first application outside of Italy was in 1997 with the Tartaiguille tunnel (high speed rail line between Marseille and Lyon in France). In this paper the authors describe the real case by which it is possible to start to make a direct comparison between A.DE.CO-RS and NATM. The Sochi Case reports the main differences observed in terms of production and of safety between the two different approaches used during excavation the Dubler Kurortnogo Prospekta tunnels.

 article #3026; publication #1040 (ROME-2018)