Geotechnical Tools

A structured collection of calculation tools covering key areas of geotechnical engineering, from site characterisation to analytical methods.

<- Back to all tools

Shear Strength Tools

Effective Cohesion (c') from Undrained Shear Strength (cu)

Selects cautious soil-type defaults for c' and keeps c' = 0.1cu as an optional empirical alternative.

Soil Profile Plot

By default, normally consolidated clay uses a selected low c′ value within 0-5 kPa, while sand / gravel uses c′ = 0. Use the optional c′ = 0.1c_u path only when that empirical interpretation is intended.

When samples are imported from Projects and Boreholes with the project tool lock enabled, sample depth is read-only here (edit under Account > Projects). c_u is filled from saved project parameters when present; otherwise, when the sample has PI and N₆₀ exists for that depth (e.g. from SPT corrections saved to the project), c_u is computed as f₁ × N₆₀ like Undrained Shear Strength (cu) from SPT (N60) and Plasticity Index (PI). You can still override c_u manually.

Use c′ = 0.1c_u empirical alternative for all rowsNC clay c′ default (kPa)

Narrow screen: swipe the table horizontally to see all columns and inputs.

Borehole ID	Sample Depth(m)	Soil type	c_u(kPa)	c′ default(kPa)	Action
				5.00
				5.00

Depth vs c′

BH not set

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.