The Standard Penetration Test (SPT) is the most popular and economical test for evaluation of subsurface information, both on land and offshore. This test is widely used to obtain the bearing capacity of soil for shallow and deep (pile) foundations. Blow counts (N) measured in the field are corrected for rod length, borehole size, sampler type, and hammer energy level. The corrected blow counts (N60) are then used for estimation of various soil properties and bearing capacity.

Dartis SPT is a powerful, user-friendly software for correlating soil properties from SPT blow counts. We have gone through many papers and geotechnical reference books and collected over 200 SPT correlations with various soil properties.

Every correlation is developed for certain soil. Dartis SPT knows that. At a specific depth, based on the site stratigraphy Dartis SPT only uses the correlations that are developed for that type of soil. We have categorized the soil types as Coarse and Fine-Grained, Coarse-Grained and Fine-Grained. Each correlation may be valid for one of above.

LIST OF CORRELATED SOIL PARAMETERS

Fine and Coarse-Grained soils

• Overburden correction factor (Cn)
• Allowable Bearing Capacity

Fine and Coarse-Grained soils

• Relative Density (Dr)
• Friction Angle (Phi)
• Elastic Modulus (Es)
• Shear Wave Velocity (Vs)
• Shear Modulus (Gmax)

Fine-Grained soils

• Undrained Shear Strength (su)
• Unconfined Compressive Strength (qu)
• Pressuremeter Modulus (Ep)
• Elastic Modulus (Vs)
• Shear Modulus (Gmax)

* Dartis SPT Correlations download link provides trial version of the software.

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