ISKRIT / Site investigation & geotechnics / Shear · triaxial · oedometer
Site investigation & geotechnics
Mechanical soil properties: friction angle, cohesion, moduli
From direct shear and triaxial test results the tool determines the internal friction angle and cohesion by least squares fitting, and computes the oedometer and deformation moduli from consolidation data.
Data current as of 2026-09-26
Standards
Oedometer processing to a standard of your choice: ASTM D2435 and EN ISO 17892-5 report the compression index Cc on the log scale and derive Young's modulus from the constrained modulus through Poisson's ratio, while GOST 12248 uses the tabulated beta factor. Consolidation cv by the Taylor square-root-of-time and Casagrande log-time constructions, both from ASTM D2435. Shear and triaxial fitting by least squares, with statistical processing per section 7 of GOST 20522.
Input
Normal stress and shear resistance pairs, or consolidation data.
Output
φ, c, Eoed, E, diagrams.
What it does
- Friction angle, cohesion, oedometer and deformation moduli from the diagrams
- Five test types on one page, printable report
- Calculations are stored on the server and reopen next time, company letterhead with signatures
Price
Free in full, no sign-up and no payment.
Open the calculator →Questions
How are φ and c determined?
By least squares linear fitting of the strength envelope.
Is E derived from Eoed?
Yes, with the β conversion factor from consolidation testing.