Geotechnical site investigations are often undertaken simultaneously with Phase 2 contaminated land investigations and similar investigation techniques are generally employed.
In-situ testing (standard penetration testing) is typically undertaken at regular intervals within the exploratory holes as they are are formed on site and samples are obtained for subsequent laboratory geotechnical testing. In-situ shear vane and/or pocket penetrometer testing is also conducted on undisturbed samples of clay. The recovered soils/rock are logged to BS5930:1999 (amendment 2). In-situ CBR or plate load testing can also be undertaken within shallow trial pits for road pavement design purposes; TRL Dynamic Cone Penetrometer testing can also be undertaken for a rapid approximate assessment of the ground CBR value to depths of around 1.5m.
Selected boreholes are often installed and subsequently monitored to enable the position of the groundwater table to be established beneath the site.
The results of the in-situ testing, soil/rock logging and water level monitoring enable the ground profile within the zone of influence of the foundation to be established. Foundations solutions to support the proposed development can then be given. Floorslab and concrete design, dewatering and excavation support advice is also made.
The Land Consultancy Limited has completed many geotechnical investigations throughout the UK on a wide variety of sites including (but not limited to):
- wind farms – for turbine, weather mast, substation/control building, buried concrete and new and upgraded track design, and to determine the suitability of rock within any proposed borrow pits.
- housing, office and industrial/commerical sites – to determine foundation, floorslab, buried concrete and road pavement design.
- sloping sites – slope stability assessments to determine stable finished slope angles and whether retaining structures are required to enable the proposed finished site levels to be attained.
In October 2012 The Land Consultancy Limited completed the geotechnical investigation of six November 2009 flood damaged roads in Cumbria on behalf of Birse Civils Ltd.
To read more about some of the geotechnical site investigations The Land Consultancy Limited has recently undertaken, please visit out case studies page.
All works are completed in accordance with latest guidelines including:BS5930:2015 'Code of practice for site investigations' NHBC Standards Plus 2017 Chapter 4.2 'Building near trees' BS10175: 2011 + A1:2013 'Investigation of potentially contaminated sites' Eurocode EN 1997 Part 1 – Geotechnical design Eurocode EN 1997 Part 2 – Geotechnical design – ground investigation and testing. EN ISO 14688 & 14689