Geotechnics
Site investigation management. Geotechnical and geomechanical analyses. Foundations of buildings, plants, viaducts and structures. Design of special foundations and of soil improvements

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Geotechnics main projects

  • Bridge crossing Messina Strait

    Control of the detailed design of the bridge foundations (tower and anchor blocks) and of the roads and railway links (foundations of civil structures; tunnels and tunnels portals). The bridge main span is 3300m long; it is supported by two towers of 360m height. The tower foundations include diaphragms walls (they are also the retaining structures for the foundations soils excavation) with deep jet-grouting columns inside.Around the foundation blocks, a wide and deep section of the natural soil is treated with jet grouting columns designed in order to prevent liquefaction during seismic events and to provide a strong confinement against horizontal loads.Anchor blocks are deeply embedded below grade and surrounded by diaphragm walls retaining structures.The road and railway links include many civil structures such as viaducts and 50kms of large diameter tunnels.

  • Autostrada Pedemontana Lombarda
  • Gioia Tauro LNG regasification plant
  • Chioggia, Italy - Venice preservation from high tide

Geotechnics

Site investigation management. Geotechnical and geomechanical analyses. Foundations of buildings, plants, viaducts and structures. Design of special foundations and of soil improvements.

The following services are provided:

  • planning, technical supervision and execution (resorting to subcontractors) of geotechnical site investigations;
  • production of geotechnical reports, to define geotechnical soil profiles and determine the relevant design soil parameters;
  • calculation reports. In agreement with a structural designer, the most suitable foundation types for the relevant case study are suggested, highlighting their performance and proposing several options. Foundation bearing capacity calculation and (both short- and long- term) settlement estimation. When piled foundations are recommended, the specific type is chosen (e.g. drilled, driven, screw piles, micropiles etc.) and design criteria are given with respect to vertical and horizontal loads, calculation methods and on-site works recommendations;
  • if shallow foundations are adopted, special attention is given to determining the design grade level, the mode of execution of excavation/fill operations and to defining the characteristics of the fill (grain size and compaction, and relevant tests). The back-filling procedures are also described;
  • special reports in the framework of challenging foundation problems where soil improvement treatments are needed such as vibroflotation, jet-grouted columns, settlement-reducing piles. Advanced calculation methods are typically implemented, involving numerical modelling of the soil-structure interaction by means of 2- or 3-D Finite Elements schemes that are able to determine the overall deformations and the loads acting on each element. The design and verification of the single reinforcement elements are then carried out with the relevant site works recommendations;
  • supervision of special geotechnical works;
  • validation of the geotechnical aspects of design carried out by other engineering firms. In recent years, critical analyses of road and highway projects have often been performed, focusing on the foundation arrangements of viaducts and overpasses, stability of embankments, expected settlements etc..
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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.