This current tool implements the modified Casagrande Plasticity Chart (1948), including the A-line, to classify fine-grained soils based on their plasticity characteristics as expressed by the Plasticity Index (IP) and Liquid Limit (LL).

This current tool estimates the modulus of elasticity or Young's modulus of soil based on theoretical correlations with N SPT number. Correlations available on this tool are mainly based on recommendations from the Foundation Analysis and Design book from Bowles (5th Edition, 1997). The tool also allows for estimating Young's modulus as an average value from multiple correlations (ie. selecting correlations for gravelly sand and saturated sand and averaging between the two).

This tool derives soil stratigraphy from CPT or CPTU data using both non-normalized (pre-1990) and normalized Soil Behavior Type (SBT) indices proposed by Robertson. By interpreting cone resistance, sleeve friction, and pore pressure data (where available), the tool identifies changes in soil behavior with depth.

The method offers a data-driven approach to interpreting subsurface layering and can complement borehole investigations, particularly in sites with limited sampling or where continuous profiling is beneficial.

The current tool estimates the deformation modulus or modulus of elasticity of soft rock based on Hoobs (1974) mass factor theoretical equation. It requires as an input the unconfined compressive strength of rock from UCS laboratory tests and RQD values from coring. The equation also requires an estimate of the modulus ratio value, Mr, to account for rock type.

Based on RQD, the equation calculates the mass factor j, to account for rock mass discontinuities, fractures, and weathering and the modulus ratio value, M, to account for rock type.