A Ground Investigation is an intrusive investigation to establish the soil and rock profile and parameters for Geotechnical and Environmental purposes.
An accurate understanding of the ground conditions is necessary for all construction projects including foundations, piling, vibroflotation, retaining walls, earthworks, slope stability, road design, dewatering, sewer construction site, tunnelling, phase 2 ground investigations for contamination analysis, landfill gas assessment, waste classification and waste disposal, etc.
Sub Surface can design a site specific Ground Investigation to satisfy the Client’s project requirements and any regulatory authorities. Our network of local offices across the UK allows us to provide a cost effective service nationwide. Sub Surface cater for all project types and sizes from small residential extensions to large corporate/government infrastructure projects. All of our Ground Investigations are carried out to the relevant British and European Standards including, BS 5930, BS 10175, etc.
Established in 1972 and with over 45+ years’ experience, Sub Surface has built a reputation as one of the UK’s leading and highly regarded independent Ground Investigation Specialist, Geotechnical and Environmental Consultancy firms.
For more information about Ground Investigations, read our blog post… What is a Site Investigation Q & A’s
The Aim of a Ground Investigation
Our aim in undertaking a Ground Investigation is to obtain information and soil parameters of the ground conditions to allow economic and safe designs to be developed and to reduce, as far as possible, the occurrence and impact of unforeseen conditions. This is achieved by obtaining disturbed and undisturbed samples for geotechnical laboratory testing and Contamination analysis, whilst carrying out in-situ testing such as, SPT’s, CPT’s, hand shear vane tests, etc.
Ground Investigations are undertaken to satisfy the requirements of our Clients’ and where necessary the requirements of any regulatory bodies, Local Authority Departments etc.
Ground Investigation Techniques
There are various methods of intrusive Ground Investigation techniques of which each technique has its advantages and limitations. The technique used will be determined by the Clients’ requirements, proposed development, site location, anticipated geology, any Local Authority Requirements and when available, the findings of a Desktop Study. Some of the most common methods Sub Surface use include:
Further details of the various Ground Investigation techniques, testing and reporting services are given under Site Investigation
All our Ground Investigations are performed to the relevant British and European Standards including, BS 5930 and all our drillers have an NVQ in Land Drilling from the British Drilling Association. Sub Surface are accredited by Constructionline and CHAS.
What’s included in our Geotechnical Ground Investigation Reports
Every project and development is different, however an interpretative Ground Investigation Report for a basic Foundation Design, would include:
- Engineer Logs
- In-situ Testing
- Laboratory Testing
- Shrinkage and swelling potential of clays/silts (cohesive strata)
- A preliminary Foundation Design
- Safe Bearing Pressures and/or Pile Loads
- Floor Slab Construction
- Groundwater Information
- Concrete Classification – Design Sulphate (DS) Class and Aggressive Chemical Environment for Concrete (ACEC) Classification
Additional items commonly incorporated within our Interpretative Ground Investigation Reports include:
- A full Geology and Mining Appraisal
- Earth Pressure Coefficients for Retaining Walls and Basements
- CBR Values for Roads, Car Parks and Hardstandings
- Percolation and Soakaway Tests
- Settlement Calculations
- Slope Stability Analysis
- Contamination Analysis
- Landfill Gas Assessment
It should be noted that when developing a brownfield site and many greenfield sites, the Local Authority generally apply a prerequisite on the Planning Conditions requiring a Phase 1 Desktop Study prior to a Phase 2 Ground Investigation.
All of our Interpretive Reports are written to the current British Standards, Eurocode 7 Standards and National House Building Council (NHBC) Standards.
How to Get a Quote for a Ground Investigation
If you would like a quote for a Ground Investigation. Please fill in our Quick Contact Form or contact your Regional Sub Surface Office (regional map via link) and email the following information (where necessary/available):
- Project requirements
- Site Location Plan
- Existing Site Plan
- Proposed Development Plan
- Phase 1 Desk Study
- Planning Conditions