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Geotechnical Investigation

Geotechnical investigations are typically required to determine the nature of the ground conditions and aid with the design of foundations, drainage systems and / or outline design. The scale of developments that may require a geotechnical investigation can range from domestic extensions to large scale commercial premises, on brownfield or greenfield land. 

Lustre Consulting has gained valuable experience carrying out preliminary geotechnical investigations, typically combined with a Phase 2 Site Investigation to form a geo-environmental investigation. Such investigations are designed to assess both the environmental and geotechnical ground conditions within one combined investigation providing a more efficient and cost effective approach. Our geo-environmental investigations enable the early identification of potential constraints posed by the condition of the ground, and if required, an indication of engineering solutions. 

How can Lustre Consulting help?

Lustre Consulting prides themselves on designing cost effective investigations to determine the nature and engineering capacity of the ground across the site.

To meet your requirements and ensure you remain compliant, all our geo-environmental investigations are carried out in accordance with current British Standards and BRE Guidance Notes, with reference to the relevant Eurocodes where applicable.

All investigations are carried out by qualified and competent consultants who are experienced in the recovery of samples, in situ testing and soil logging to British Standards. Our findings are always detailed in a transparent and interpretative report with clear and helpful conclusions, including any early considerations for foundation and / or drainage design. 

Investigation Methods

Each investigation is site specific with the chosen exploratory method(s) depending on the site access, ground conditions and likely foundations (e.g. deep piles or traditional shallow pad foundations). Available methods include:

  • Hand excavated pits and hand augering (particularly when assessing existing foundations).

  • Machine excavated trial pits.

  • Window sample boreholes.

  • Dynamic probes.

  • Cable percussive boreholes.

  • Rotary boreholes.

During the investigation and depending on the ground conditions, a variety of techniques can be employed to assess the engineering capacity of the soils, including:

  • Standard Penetration Tests (SPTs).

  • Cone Penetration Tests (CPTs).

  • In-situ tests using a penetrometer and / or shear vane.

  • Recovery of undisturbed samples (such as UT100s).

  • Recovery of disturbed samples (bulk bags).

Lustre Consulting also has extensive experience in carrying out Soakage Testing to determine whether soakaways would be a suitable drainage option.