OR/19/019 Geotechnical data and its distribution

Entwisle, David, C. 2019. Engineering geology and geotechnical summary of central Glasgow in the vicinity of the UK Geoenergy Observatories field sites. British geological Survey. (OR/19/019).

This report synthesises legacy data held in the BGS National Geotechnical Properties Database from previous site investigations, prior to the drilling of the UK Geoenergy Observatories (UKGEOS) boreholes.

The geotechnical data presented in this report comes from civil engineering projects and is provided by clients, consultant and contractors. Data is added to the British Geological Survey’s National Geotechnical Properties Database (for information on the database see Self et al. 2012) from analogue (paper and pdf reports) and Association of Geotechnical and Geoenvironmental Specialists (AGS) data transfer format files. Most of the data was added for the work associated with the production of the Geotechnical GIS of central Glasgow (quarter sheets NS56SE, NS56NE, NS66SW and NS66NW) with recent additions of data donated (AGS) data transfer format files. The data density not only depends on the number of boreholes but also the depth of the boreholes, which controls the lithostratigraphical units intersected and number of sample points down the borehole. Also, the thickness of the superficial thickness, as shown with the borehole terminal depths, can be used to identify which boreholes are likely to intercept the bedrock (Figure 2).

The location of the standard penetration test data (Figure 3) and water content, plasticity and density (Figure 4) are mostly from the Clyde Gateway regeneration area. Particle size data is mostly from the Clyde Gateway regeneration area but also to the south (Figure 5). Rock uniaxial compressive strength data (Figure 6) is from the same area but few most of the data are out with the regeneration area. The rock quality designation (Figure 7) and fracture index (Figure 8) are from a wider area.

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Figure 2    Location of the site locations, Clyde Gateway boundary, final depth of boreholes and pits from the BGS National Geotechnical properties Database and the superficial thickness model. (Includes mapping data licensed from Ordnance Survey. © Crown Copyright and/or database right 2019. Licence number 100021290 EUL).

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Figure 3    Location of boreholes in which standard penetration test data (yellow points) and proposed borehole location sites (green points). The Clyde Gateway regeneration area (blue border). (Includes mapping data licensed from Ordnance Survey. © Crown Copyright).

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Figure 4    Location of water content, plasticity limit and density data (pinkish purple points) and proposed borehole location sites (green points). The Clyde Gateway regeneration area (blue border). (Includes mapping data licensed from Ordnance Survey. © Crown Copyright and/or database right 2019. Licence number 100021290 EUL).

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Figure 5    Location of particle size data (dark blue) and proposed borehole location sites (green points). The Clyde Gateway regeneration area (blue border). (Includes mapping data licensed from Ordnance Survey. © Crown Copyright and/or database right 2019. Licence number 100021290 EUL).

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Figure 6    Location of rock uniaxial compressive strength data (orange points) and proposed borehole location sites (green points). The Clyde Gateway regeneration area (blue border). (Includes mapping data licensed from Ordnance Survey. © Crown Copyright and/or database right 2019. Licence number 100021290 EUL).

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Figure 7    Distribution of rock quality designation data (dark green points) and proposed borehole location sites (green points). The Clyde Gateway regeneration area (blue border). (Includes mapping data licensed from Ordnance Survey. © Crown Copyright and/or database right 2019. Licence number 100021290 EUL).

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Figure 8    Distribution of fracture index data (brown points) and proposed borehole location sites (green points). The Clyde Gateway regeneration area (blue border). (Includes mapping data licensed from Ordnance Survey. © Crown Copyright and/or database right 2019. Licence number 100021290 EUL).