Offshore
Foundation design and analyses related to the installation of offshore platforms and marine structures. Harbours, trestles and near-shore works

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Offshore

Foundation design and analyses related to the installation of offshore platforms and marine structures. Harbours, trestles and near-shore works.

SOIL’s expertise in offshore engineering has always been one of their key strengths. The know-how in this field has been constantly updated since SOIL’s establishment.

Typical capabilities are:

  • design of geophysical and geotechnical site investigations at sea, both in medium (100m) and deep (up to >1500m) water, including technical specifications, remote and on-board supervision of works;
  • data interpretation to deduce the design soil profile and all needed parameters for further analyses. This is typically done (e.g.) for the design of submarine pipelines, to analyse the stability at seabed and pipeline burial by means of appropriate soil models;
  • geotechnical design of offshore platforms. With reference to piling, this involves design with respect to both horizontal and vertical loads and pile installation/driving analyses. Back-analyses of pile driving are often performed to check the actual attainment of the expected bearing capacity. Stability problems of temporary foundations (prior to pile installation) are also always addressed;
  • geotechnical and/or structural design of pull-in devices (for the onshore connection of submarine pipelines) and anchorages of floating bodies;
  • design of near-shore structures such as quays, trestles, piers, breakwaters, dredged areas, disposal basins, etc.
    The most suitable construction solutions are chosen (steel/concrete, driven/drilled piles, caissons etc.) and relevant design criteria are defined. If embankments/breakwaters at sea are concerned, stability analyses and settlement evaluations are performed.

In all cases, design is completed by on-site works recommendations (including possible monitoring instrumentation).
In recent years, validation of projects by other engineering firms has often been carried out, involving detailed critical analyses and providing support to designers until the fulfilment of all relevant standards has been achieved.

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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.

 

Consultants:
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.