Methodology
Our methodology integrates phased site investigation, advanced laboratory testing, and numerical modelling to characterise ground behaviour. We adhere to Eurocode 7 and BS 5930 for all ground investigation works, employing Standard Penetration Testing (ASTM D1586) to derive soil strength parameters. Laboratory programmes include triaxial shear testing, consolidation, and classification. For slope stability analysis, we apply limit equilibrium and finite element methods, while retaining wall design follows limit state principles. This systematic approach ensures robust, defensible designs for our clients.
Reference Technical Parameters
| Parameter | Reference Value |
|---|---|
| SPT N-value (sand) | 10–30 blows/300mm |
| Undrained shear strength (clay) | 30–120 kPa |
| Angle of internal friction | 28°–38° |
| Unit weight | 18–22 kN/m³ |
Local Considerations — United Kingdom
The UK's geological diversity—ranging from London Clay and Chalk to glacial tills in the north—requires region-specific expertise. Seismic hazard is low (PGA <0.1g per UK National Annex to Eurocode 8), but mining legacy and soluble ground (e.g., chalk dissolution) pose risks. Our firm applies local knowledge of groundwater regimes and soil fabric to every project, ensuring compliance with national standards and best practice.
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Applicable Standards
- Eurocode 7 (BS EN 1997-1:2004+A1:2013)
- BS 5930:2015 Code of practice for ground investigations
- ASTM D1586 Standard Test Method for SPT
Frequently Asked Questions
What is geotechnical engineering and why is it important in the UK?
Geotechnical engineering assesses ground conditions to design safe foundations, slopes, and retaining structures. In the UK, variable geology and historical land use make thorough site investigation critical to avoid costly failures and ensure compliance with Eurocode 7.
What standards govern geotechnical work in the United Kingdom?
Geotechnical design in the UK follows Eurocode 7 (BS EN 1997) and its National Annex. Ground investigations comply with BS 5930, and SPT testing adheres to ASTM D1586. These standards ensure consistent, reliable results across the country.
How does your firm approach slope stability analysis?
Our firm uses limit equilibrium and finite element methods to evaluate slope stability, considering soil shear strength, groundwater, and surcharge loads. We apply partial factors per Eurocode 7 to deliver safe, economical designs for natural and engineered slopes.