Ruddlesden geotechnical


Detailed Foundation Appraisal

Recommendations for foundation design are one of the most commonly provided geotechnical consultancy services provided by Ruddlesden geotechnical.

From an assessment of exploratory hole (trial pit/ borehole) and laboratory testingdata, recommendations for the most suitable foundation solution, e.g. strip/ trench-fill, pad, reinforced, raft, piled etc., are provided.

Bearing capacity and geotechnical parameters for foundation design are also provided in Ruddlesden geotechnical’s reports.

Case Study

Foundations Options Appraisal, Somerset

The Somerset Levels typically comprise a thick sequence of Quaternary and Recent Alluvium/ Tidal Flat Deposits, made up of layers of peat, clay, silt, sand and gravel, underlain by Triassic and Jurassic bedrock deposits.

The cost-effective development of residential housing can be difficult in this area of the country, due to the deep Alluvium/ Tidal Flat Deposits, often ranging between 10m and >20m in thickness, which sometimes results in piled foundations being the default foundation solution, which can often affect the viability of the project.

The upper 1.5m-2.0m of the Alluvium/ Tidal Flat Deposits often comprise desiccated clay soils and can, in some circumstances, provide a suitable founding stratum for shallow foundations.

Conversely, for larger developments, ground improvement can also be considered to facilitate the use of shallow foundations, as a cost-effective alternative to piles.

As part of a general ground investigation, Ruddlesden geotechnical have recently undertaken a foundation options appraisal in Weston-super-Mare for a proposed residential development, where all of the above were considered, to provide the most cost-effective solution for the developer. A mix of piled and strip/ trench-fill foundations were recommended, directly relating to the underlying geology.

  • AGS
  • Constructionline
  • CSCS
  • SMAS
  • ECFC trust