Geotechnical Tools
A structured collection of calculation tools covering key areas of geotechnical engineering, from site characterisation to analytical methods.
Shear Strength Tools
Undrained Shear Strength (cu) from SPT (N60) and Plasticity Index (PI)
Uses Stroud (1974) PI-based f1 interpretation and estimates cu = f1 N60 (kPa) for cohesive-soil screening.
Soil Layer Profile
Enter PI and corrected N60 by layer. The tool derives f1 from Stroud (1974) PI anchors and computes cu = f1N60 for each layer.
If available, N60 is auto-filled from Standard Penetration Test (SPT) Corrections for N₆₀ and (N₁)₆₀. Manual override is always allowed.
Narrow screen: swipe the table horizontally to see all columns and inputs.
| Borehole ID | Sample Depth(m) | PI(%) | N60 | f1 | cu(kPa) | Action |
|---|---|---|---|---|---|---|
5.50 | 66.00 | |||||
4.88 | 87.84 | |||||
Depth vs cᵤ
Save Profile Analysis
Save current profile inputs and plot images to the active project folder.
Cloud save is available from Bronze upward. Register for an account to use cloud save. You can still use tools with manual inputs.
Select a project/borehole from the top-right dropdown first.
Important disclaimer
These results are simplified and indicative only. Please review the site-wide Disclaimer before using this tool in any engineering workflow.