Cross-CPT correlatie
Verbindt lagen over CPTs op basis van absolute hoogte (m TAW), grondsoort en qc.
Vereist bevestigde maaiveldshoogte per CPT.
Geologische doorsnede
Projectie van gecorreleerde lagen op een verticaal vlak. Absolute hoogte (m TAW) op
Y-as, afstand langs de doorsnede op X-as.
Verticale schaal × 2
Load CPT — GEF, Excel or CSV file
Belgian/Dutch GEF, Excel workbooks with Header/Data sheets, or a CSV with depth and
qc columns. GEF quantity IDs: 1=depth, 2=qc, 3=fs, 4=Rf, 6=u2.
Drop one or more .GEF, .XLS, .XLSX or .CSV files here or click to browse
Select multiple files at once to create multiple CPT tabs. GEF column order comes from
COLUMNINFO; Excel and CSV columns are detected from their headers.
No file?
Classification method
Choose a method, set minimum layer thickness, then click Apply. Robertson 2016 is the
recommended default for most projects in the current app.
Robertson (1990) — SBT / Ic
Normalised Qt and Fr. Stress-dependent — accounts for depth.
Robertson (2016) — SBT / Qtn Recommended
Iterative Qtn and Fr. Preferred default; may be especially useful when the input is a CPTu; still works when u2 is absent.
CUR 3 layers
Broad practical layering chart using direct qc and Rf. Produces Sand, Silt, Clay, and Peat zones for layer generation.
NEN 6740
Stress-dependent qc,NEN and friction ratio. Uses the 14-area NEN material chart for more detailed CPT interpretation.
NEN Tabel 3
Direct subtype table from qc and Rf. Fine-grained route that often aligns well with later parameter assignment.
Sensitivity:
Minimum layer thickness: m Layer identification
Boundaries from soil-type changes + min-thickness filter. Edit any parameter — italic
orange = manual override.
Parameter methode: Grondsoort en consistentie uit NEN Tabel 3 (EC7) — aanbevolen
Thin-layer merging uses the minimum thickness set in Stage 2. Values with italic orange border are manually
overridden and feed into Stage 4. Dropdown shows ✓ for best qc/Rf match — greyed entries are
outside the expected range for this layer.
| # | Top (m) | Bot (m) | Top (TAW) | Bot (TAW) | Thick. | Soil type ▾ override | avg qc | avg fs | avg Rf% | γ (kN/m³) | γ_sat | φ' (°) | c' (kPa) | cu (kPa) |
|---|
Model parameters
Mohr-Coulomb and Hardening Soil (p_ref = 100 kPa). Eoed,i = αE × qc (Sanglerat /
SB260). Review m and Eoed,ref per layer.
α-method:
Stiffness:
k_h/k_v:
Review m-values. Use Tuning (Stage 5) to fit m from CPT data.
Tuning — m fitting
Per-layer OLS regression of ln(E_oed,i) vs ln(σ'v0 stress ratio) to fit m and
E_oed,ref from CPT data directly. Review each fit before accepting.
The fitted m replaces the type-default only when the engineer explicitly accepts it per layer.
Fit quality is shown as R² — values below 0.5 indicate too much scatter or insufficient depth
range; keep the default in that case. Stage 5 is bedoeld als engineer preview.
Representatieve m-waarden horen bij voorkeur uit laboproeven te komen.
Verwacht in het algemeen een m-waarde tussen 0 en 1; waarden daarbuiten vragen extra
engineering judgement.
Use Stage 6 to turn the interpreted CPT into a first engineering estimate.
Applications
Use the interpreted CPT profile for first engineering calculations. Stage 6 reuses the
active CPT, current layer model, current water table, and accepted Stage 5 tuning.