Our range of services include:

  • Site investigation, scoping, procurement and experienced supervision
  • Interpretation of factual data and provision of geotechnical design parameters
  • Preparation of geotechnical, interpretative and engineering reports
  • Design of shallow and deep foundations to Eurocode 7
  • Engineering solutions over soft ground
  • Tunnelling and associated ground settlement assessments
  • Independent/Category III checking for earthworks design
  • Slope stability assessment
  • Design for temporary and permanent works
  • Peat stability risk and hazard assessments
  • Soils, geology and hydrogeology input for EIS preparation.

We have the in-house geotechnical engineering expertise to determine the properties of soil and rock in order to design a cost effective and technically appropriate foundation solution on projects encountering difficult ground conditions.

Our Projects

galway-windGalway Wind Park, Site Investigation

Client: SSE Renewables

Location: Galway, Ireland

Capital Value: c. €250 m (overall project value)

Key Facts: Detailed site investigation for 69 wind turbine sites including site tracks and other infrastructure.

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Groundwater was encountered during site investigation, particularly within the peat overburden and weathered rock.  Due to the impermeable nature of the peat and bedrock, rapid runoff and flooding during heavy rainfall was also encountered.  All aspects of the site investigations were procured and managed by FT and involved the following:

  • The excavation of approximately 400 trial pits up to 3.5m
  • The boring and sampling of approximately 70 rotary boreholes to approximately 20m depth (open hole and rotary coring) and 10 rotary boreholes to approximately 10m depth with the construction of approximately 80 groundwater monitoring standpipes.
  • Peat probing (by hand) at approximately 1,000 locations
  • Completion of daily field reports and recording all trial pit and borehole data
  • Surveying of the borehole locations and ground elevations
  • Producing information in AGS version 3 or 4 digital data format (certified error free)
  • In-situ testing, sampling and laboratory testing as instructed by the Employer’s Representative
  • Preparing a factual report consisting of a full description of the stratigraphy encountered in the exploratory holes, the results of laboratory and in-situ testing and a location plan showing the location of the exploratory holes
  • Liaison with relevant third parties.

Gorey-To-ArklowN11 Gorey To Arklow Link – Geotechnical

Client: Wexford County Council

Location: Wexford, Ireland

Capital Value: €100M

Key Facts: The N11 Gorey to Arklow Link traverses 23km of rural countryside to the east and south of the existing N11 and was, generally, constructed within a ‘green field’ setting. The project consisted of 18 cuttings, 18 embankments, 36 structures, two grade separated interchanges and various side and link roads. FT was retained as designer for the main contractor, Roadbridge Ltd, on this €100M design and build scheme. The N11 Gorey to Arklow Link forms part of the Dublin to Wexford National Primary Route (N11).

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The alignment route was overlain primarily by glacial deposits (glacial till), with very limited thicknesses of alluvium being encountered at a few locations in the immediate vicinity of rivers and streams.  The thickness of glacial deposits over bedrock varies widely from a thin cover to more than 20m at some locations.

The geotechnical design element of the project consisted of assessment of the alignment stratigraphy, analysis of the existing site investigation data, detailed design of the cuttings and embankments, and preparation of the geotechnical interpretative report (GIR).

The detailed earthworks design involved the assessment of ‘Macamore Clay’, a marine deposit found locally in the southeast of the country.  It is distinguished from other glacial deposits by its high Silt and Clay content in addition to it’s carbonate content.

This soil type presented an interesting design challenge as it’s properties were that of a heavy clay similar to London or Gault Clays more commonly encountered in the United Kingdom.  As this soil was not a typical Irish glacial clay, FT carried out detailed analysis of the site investigation laboratory and field test results, and conducted additional sampling and testing of to ensure that a sufficiently accurate ground model for analysis and design of the earthworks and structure foundations was carried out.

An analysis of the site investigation data revealed that the soils along the alignment comprised a low fines gravelly clay (boulder clay) throughout the southern section, a high fines gravelly clay (boulder clay) throughout the mid section and ‘Macamore Clay’ along the remaining northern portion of the alignment.  As a result, the design side slopes ranged from 1V:2H along the southern low fines section, 1V:2.5H throughout the mid high fines section and 1V:3H in sections were Macamore Clay was encountered.  Geotechnical coloured long sections were prepared early in the design to provide the contractor with an initial picture of the soils covering the site, thus allowing him greater accuracy in preparing mass haul  and construction programmes.

Seecon-Wind-FarmSeecon Wind Farm, Co. Galway Environmental Impact Statement – Peat Stability Assessment

Client: Coillte Teoranta

Location: Galway, Ireland

Capital Value: €75M

Key Facts: Detailed peat stability assessment in accordance with Scottish Executive guidelines as peat and steep slopes extend over much of the site.

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Issues of particular environmental concern that were addressed as part of the EIS included peat and steep slopes over much of the site; a detailed peat stability assessment was prepared in accordance with Scottish Executive guidelines.  The presence of Whooper Swans in the lakes to the north of the site required a thorough vantage point survey and careful assessment of potential impacts and mitigation measures. The proposed development is bounded by the Connemara Bog Complex, which is designated as an SAC and pNHA and Oughterard District Bog NHA.

The environmental impact assessment addressed all aspects of the environment on which the development could have an impact. FT’s key responsibilities were as follows:

  • Project management of EIS and planning application
  • Consultation with interested parties
  • Extensive ecological surveys and reporting
  • Soils, geology, hydrogeology and peat stability assessments
  • Water quality & hydrology
  • Landscape impact assessment (3rd party study)
  • Cultural heritage impact assessment (3rd party study)
  • Noise modelling and analysis
  • Other impacts on human beings and material assets

Planning permission was awarded for the proposed development in November 2011.

jeddahJeddah Environmental Assessment – Geotechnical

Client: AECOM

Location: Jeddah, Kingdom of Saudi Arabia

Capital Value: N/A

Key Facts: Develop the Jeddah Environmental and Social Master Plan (JESMP) for the Governorate of Jeddah.

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The JEA comprised 15 Data Assessment and Analysis Reports, each of which addressed key areas of concern regarding the human and natural environment in Jeddah.  A part of this commission FT carried out hydro-geological investigations, analysis and reporting on the unique geology of the Red Sea coast and inland within the wadiis of the Hijaz foothills.  These varied conditions comprise soft alluvial sands and clays with high ground water levels, through to highly weathered and faulted granite.

Europe

Eamon Timoney

Telephone: +353 21 4969553
Email: eamon.timoney@nullftco.ie

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