The cone penetration test (CPT) is one of the most efficient methods of in-situ ground investigation. The interpretation of CPT data — particularly the derivation of soil classification, characteristic parameters and bearing capacities — relies on internationally recognised methods. We use the methodology as one of the tools within our ground investigation reports and desk studies; it is not offered as a stand-alone service.
Evaluation Methods
- Schneider et al. (2008) — adapted for German soil conditions, established under DIN EN 1997-2
- Robertson (1990, 2010) — universal standard with global applicability
- Eurocode 7 unified method — for standards-compliant deliverables
Derived Parameters
- Soil classification (Soil Behaviour Type, SBT)
- Relative density of granular soils
- Undrained shear strength of cohesive soils (cu)
- Effective friction angle (φ')
- Constrained modulus (Eoed) and Young's modulus (E)
- Bearing capacity for shallow and deep foundations
- Liquefaction potential in seismic regions
CPTu Interpretation (with Pore Pressure)
- Pore pressure dissipation tests for permeability and consolidation behaviour
- Identification of fine layers and contact transitions
- Verification of partially drained or undrained behaviour
Important note: CPT data alone do not replace direct soil sampling and laboratory testing. Reliable foundation design always requires the combined evaluation of CPT data, drilling logs and laboratory results — that is exactly what we provide.