SAFE BEARING PRESSURE FROM EMPIRICAL EQUATIONS BASED ON CPT VALUES FOR FOOTINGS ON COHESIONLESS SOIL.
Terzaghi and Peck curves (1948). As these equations were also found to be conservative, modified forms with an increase of 50 percent over the original values are given below.
An approximate formula for all widths
where qc is the cone point resistance in kg/cm2 and qs in kPa.
The above equations have been developed for a settlement of 25 mm.
Meyerhof (1956) developed his equations based on the relationship qc = 4Ncor kg/cm2 for penetration resistance in sand where Ncor is the corrected SPT value.