Geotechnical software solutions
Dartis SPT Correlations
- More than 200 correlations
- Powerful presentation of results
- User friendly
- No need for installing big volume databases
- Bearing capacity estimation from SPT
SPT Correlations Software
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.
Relative Density (Dr)
Friction Angle (Phi)
Elastic Modulus (Es)
Shear Wave Velocity (Vs)
Shear Modulus (Gmax)
Undrained Shear Strength (su)
Unconfined Compressive Strength (qu)
Pressuremeter Modulus (Ep)
Elastic Modulus (Vs)
Shear Modulus (Gmax)
Dartis SPT shows the equations used for each correlation. Just click on each correlation and the equation will be shown below the list of correlations. Equations have also been included in the report.
Correction of SPT Blow Counts
The program automatically applies the following corrections on SPT field data (N) to obtain N60 and N1(60): Borehole Size, Sampling Method, Rod Length, Energy Level, Overburden Stress Corrections (covers 6 methods), Water Level Correction (optional – for bearing capacity analysis when N60≥15)
Bearing Capacity Analysis
Using ِDartis SPT you can estimate bearing capacity of footings based on SPT blow counts.
- Teng (1969)
- Meyerhof Method
- General Terzaghi Formula
- Terzaghi and Peck (1948)
- Modified Meyerhof (1965)
- Anagnostopoulos et al. (1991)
- Burland and Burbidge (1985)