A structured collection of calculation tools covering key areas of geotechnical engineering, from site characterisation to analytical methods.
Select a subcategory below to browse the tools in this group.
Shear Strength Tools
Energy and equipment corrections yield N60; vertical effective stress follows sample depth, groundwater depth, and bulk unit weight, then Idriss and Boulanger (2008) gives CN and (N1)60.
Open ToolShear Strength Tools
Uses Stroud (1974) PI-based f1 interpretation and estimates cu = f1 N60 (kPa) for cohesive-soil screening.
Open ToolShear Strength Tools
Selects cautious soil-type defaults for c' and keeps c' = 0.1cu as an optional empirical alternative.
Open ToolShear Strength Tools
Effective friction angle is estimated from corrected SPT resistance N₆₀ using the empirical correlation cited by Peck, Hanson, and Thornburn (1974).
Open ToolShear Strength Tools
Uses the PI-based cohesive-soil correlation φ′ = 45 − 14 log₁₀(PI), consistent with the charted trend cited by Sorensen and Okkels (2013).
Open ToolRigidity / Deformation Tools
Small-strain shear modulus is obtained from the standard elastic wave relationship using shear wave velocity and either mass density or unit weight.
Open ToolRigidity / Deformation Tools
Oedometer constrained modulus is obtained from the standard one-dimensional compressibility relationship used in classical settlement interpretation.
Open ToolRigidity / Deformation Tools
Uses the Butler (1975) correlation for cohesive soils, where Eu/N60 is taken within 1000 to 1200 kN/m2 for preliminary screening.
Open ToolRigidity / Deformation Tools
Estimates E' from E' = β'Eu, where Eu is derived from PI and OCR based Eu/cu screening trends and Eu = (Eu/cu)cu.
Open ToolRigidity / Deformation Tools
Estimates E' for cohesionless soils using selectable Kulhawy and Mayne (1990) and Bowles (1996) SPT correlations.
Open ToolStress Related Tools
OCR is computed from preconsolidation stress and automatically calculated current vertical effective stress at sample depth.
Open Tool