GI-SPT

The Standard Penetration Test (SPT) is widely used in geotechnical engineering and provides valuable insights into soil properties and design parameters. GI-SPT provides corrections for hammer efficiency, sampler type, borehole diameter, rod length, and effective overburden pressure. It also helps you estimate various soil engineering properties using N, N60, and (N1)60, such as cohesion, friction angle, elastic modulus, shear wave velocity, and California Bearing Ratio (CBR).
The results are presented in both tabular and graphical formats and can be exported to Excel. Our software also generates an overview report summarizing input parameters and results.

Available correlations in GI-SPT: 

Relative Density 

• Maynehoff (1957) 
• Holtz and Gibbs (1979) 
• SPTempkin (1989) 
• Yoshida et al. (1988) 
• Kulhawy and Mayne (1990) 
• Cubrinovski and Ishihara (1999) 

Friction Angle 

• Maynehoff (1955) 
• DeMello (1971) 
• Peck et al. (1972) 
• Shioi and Fukui (1982) 
• Kulhawy and Mayne (1990) 
• Hatanaka and Uchida (1996) 

Cohesion 

• Terzaghi and Peck (1967) 
• Kulhawy and Mayne (1990) 
• Manual K Multiplier 

Elastic Modulus 

• Fennett (1969) 
• Webb (1999) 
• Kulhawy and Mayne (1990) 
• Bowles (1996) 
• Goukou (2001) 
• AASHTO (2017) 

Shear Wave Velocity 

• Imai (1977) 
• Ohta and Goto (1978) 
• Seed and Idriss (1981) 
• Sykora and Stokoe (1983) 
• Brandenberg et al. (2010) 
• Wair et al. (2012) 
• Japan Road Association (2002) 
• User-defined correlation