Meyerhof Method (SPT)
This solution for cohesive and cohesionless soils use a Meyerhof theory, where the bearing capacity of foundation soil is given by a formula:
It is recommended to use a safety factor FS = 3 when calculating the bearing capacity using this method.
bearing capacity of foundation soil
average value of SPT blow counts measured at depths from footing base to 1,5.bef bellow the footing base
effective footing width
GWT influence factors
depth of footing bottom
load inclination factor
The formula is derived for imperial units [tsf, ft] - the program calculates automatically in the units used in the program.
In saturated very fine or silty sands, the measured SPT blow count for Ni > 15 should be corrected as follows:
This corellation can be performed automatically in the frame "".
GWT influence factors Cw1 and Cw2 are determined as follows:
hGWT = 0 (water in the terrain level) -> Cw1 = Cw2 = 0,5
hGWT = d (water in the depth of footing bottom) -> Cw1 = 0,5; Cw2 = 1
hGWT > d + 1,5.bef -> Cw1 = Cw2 = 1
depth of ground water table from the terrain
Intermediate values Cw1 and Cw2 are interpolated.
Load inclination factor Ri is interpolated according to the following table:
horizontal component of resultant load
vertical component of resultant load
This method should not be used for ratio H/V > 0,6.
The influence of inclined terrain and inclined footing bottom is considered same way as in.
Bridge Engineering Handbook (Wai-Fah Chen, Lian Duan, 1999)