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G&J offers a range of geotechnical monitoring and in-situ testing either through our in-house capability or in collaboration with our approved specialist contractors.

 

G&J's in-house capabilities include:

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• Periodic or continuous groundwater level and porewater pressure monitoring including the use of simple standpipe observation wells, to downloadable 'divers', to vibrating wire piezometers;

• Down borehole inclinometer monitoring to measure ground movement for slope stability assessments;

• Down borehole extensometer monitoring to measure ground movement for settlement assessments;

• Hand-shear vane testing of cohesive soils, to assess its undrained shear strength;

• TRL Dynamic Cone Penetrometer (DCP) testing to assess the in-situ strength or CBR of shallow soils, and variations within them;

• Soakaway testing to BRE Digest 365 in trial pits or falling head tests in boreholes, to give an indication of a soil's permeability.
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G&J can also specify, arrange and supervise:

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• Earthworks compliance testing (including core cutter and/or sand replacement tests, plate load tests, CBR testing, Nuclear Density Meter (NDM) testing, and longer term zone/dummy foundation testing);

• Penetration testing such as heavy dynamic probing and standard penetration tests (SPT);

• Non-intrusive geophysical surveys such as ground penetrating radar, ground conductivity mapping or resistivity profiles, to help identify variations in the ground such as changes in geology or the presence of man-made hazards such as old sub-structures or mine shafts;

• Cone Penetration Testing (CPT) to provide almost continuous data on properties such as soil strength and porewater pressure variation with depth;

• Ground settlement monitoring, often as part of an earthworks project or when investigating ground subsidence;

• Ground vibration monitoring, typically to assess the likely effects of site activities such as piling or heavy plant movements on neighbouring properties or structures.