The Analysis of Controlled Deformation in Rocks and Soils (ADECO-RS), the crowning point of long in-depth research into the stress-strain behaviour of more than 400 km. of tunnel and more than 1,000 faces, is a design and construction approach developed by Rocksoil S.p.A..

The ADECO-RS approach makes a clear distinction between the design and the construction moments, allowing reliable forecasts of construction times and costs to be made. It uses the advance core (the core of ground ahead of the face) as a structural tool for the long and short term stabilisation of tunnels, after its rigidity has first been regulated by means of conservation techniques. Tunnels can consequently be driven in difficult stress-strain conditions to predetermined safety standards with precise scheduling and industrialisation of operations.

The excellent results achieved have induced major Italian clients (Autostrade S.p.A., A.N.A.S., ITALFERR SIS T.A.V. S.p.A.) to adopt the 'ADECO-RS approach in their specifications and norms. The tunnels on the new Bologna to Florence and Rome to Naples High-Speed rail lines have been designed and are being constructed on the basis of the ADECO-RS approach.

This new way of constructing tunnels has also aroused considerable interest abroad where it was chosen for the construction of the difficult Tartaiguille tunnel (Marseilles to Valence railway line).