Underground structures: natural and artificial tunnels, subways and related stations. Reinforced concrete structures and retaining walls. Roads tracing

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Underground structures: natural and artificial tunnels, subways and related stations. Reinforced concrete structures and retaining walls. Roads tracing.

Structural design is carried out with a view of geotechnical aspects in all Civil Engineering fields, with the capability of following the development of a project from the FEED to the detailed design phase. Our design approach privileges the optimisation of costs and construction schedules with respect to the Contractor’s requirements.

Despite SOIL’s strong geotechnical background, we are able to provide comprehensive structural design services, with special reference to the following areas:

  • transportation infrastructures: railways, highways, roads. Our capabilities span from the study of layout, including geological issues, to structural design.
  • civil structures: geotechnical and structural design of steel and reinforced concrete structures, including the detailed study of soil-structure interaction.
  • deep excavations and underground works: underground (subway), tunnels, caverns, wells, open-air deep excavations. In this field (constituting the core strength of our structural team), comprehensive engineering services are provided from the study of the pre-existing natural environment to the definition of optimal design solutions from both the technical and economical point of view. Detailed numerical 2- and 3-D Finite Element modelling is often carried out.

Design activities are complemented by technical assistance during construction; when geotechnical works are concerned the calculation assumptions are checked by real-time monitoring of the stress-strain behaviour of the soil-structure complex.

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Costa Concordia Parbuckling

For the purposes of the safe removal of the Costa Concordia wreck, SOIL Srl has been involved into all aspects concerning the geological and geotechnical design and assistance for the construction of the foundation structures.

The Costa Concordia Wreck Removal Project foresaw in the first stage the rotation of the wreck to its vertical position (parbuckling phase) and subsequently its re-floating by means of the installation of steel caissons on both sides of the ship.

The parbuckling required the construction of underwater anchoring structures on the landward side of wreck and the installation of three submerged platforms for its temporary support in vertical position on the seaward side. The structures were built respectively at water depths of 5 ÷ 10m and 40 ÷ 50m below sea level. Drilled steel piles (D = 2m) were designed for the platforms foundations.

The activities performed by SOIL Srl concerned:

Working Group

Project Leaders:
Eng. Luigi Albert: general management, geotechnical design of foundation structures;
Geol. Fabio Staffini: design team coordinator, geological design and geomechanical modeling.

Design team:
Eng. Angelo Lambrughi: technical supervision during the investigation surveys, geomechanical modeling of the anchor blocks and technical supervision during construction and testing of the foundation structures;
Eng. Pietro Coppola: geomechanical modeling for the piles of the sea side platforms;
Eng. Davide Spinelli: geotechnical design of foundation structures;
Geol. Marta Senaldi: geological mapping, geological and geomechanical design.
Eng. Alessandro Bonasio: morpho bathymetric modelling and CAD drawings.


Prof. Eng. Giancarlo Gioda: geomechanical modeling of fractured rock masses around the piles;
Prof. Geol. Giorgio Pasquaré: general geological survey of the onshore areas;
Geol. Teodoro Aldo Battaglia: geological survey and assistance for the positioning of the anchor blocks;
Geol. Andrea Rossotti: diving assistance for the positioning of the anchor blocks.