The ground investigation report is the central deliverable of every project. It documents the subsoil situation, derives characteristic design parameters and contains explicit foundation recommendations. The methodology follows DIN 4020 and Eurocode 7 (DIN EN 1997-1/-2), and the geotechnical category (GC 1, GC 2 or GC 3) is determined according to the project complexity.
Content of a Ground Investigation Report
- Project description and geological context
- Documentation of the executed investigation (boreholes, CPT, laboratory tests)
- Soil and rock classification to DIN EN ISO 14688/14689
- Hydrogeological situation and groundwater levels
- Characteristic soil parameters for design (γ, φ', c', Es)
- Geotechnical category to Eurocode 7
- Foundation recommendations and bearing capacity calculations
- Settlement predictions to DIN 4019
- Notes on excavation works, dewatering, and earthworks
- Risk indicators (e.g. fill, contamination, unexploded ordnance)
Standards and References
- DIN 4020 — Geotechnical investigations for civil engineering purposes
- DIN EN 1997-1 (Eurocode 7-1) — General rules
- DIN EN 1997-2 (Eurocode 7-2) — Ground investigation and testing
- DIN EN ISO 14688 — Identification and classification of soil
- DIN EN ISO 14689 — Identification and classification of rock
- DIN EN ISO 17892 — Laboratory testing of soil
- DIN EN ISO 22475/22476 — Sampling methods and field tests
Applications: Residential and multi-family housing · Commercial and industrial buildings · Foundations for additions and renovations · Underground car parks · Photovoltaic ground-mounted systems · Wind turbines · Battery storage facilities · Infrastructure projects