DIN 4017
The solution is based on German standard DIN 4017, where the bearing capacity of foundation soil is given by the formula:
where:
bearing capacity factors: | ||
for: | ||
for: | ||
shape factors: | ||
for: | ||
for: | ||
inclination factors for φ > 0: | for: * | |
for: | ||
where: | ||
for: | ||
for: | ||
inclination factors for φ = 0: | ||
ground factors: | for: | |
for: | ||
for: | ||
for: | ||
for: | ||
for: | ||
base factors: | for: | |
for: | ||
for: | ||
for: |
where: | c | - | cohesion of soil |
q0 | - | equivalent uniform load accounting for the influence of foundation depth | |
d | - | depth of the footing bottom | |
γ1 | - | unit weight of soil above the footing bottom | |
b | - | width of foundation | |
γ | - | unit weight of soil | |
Nc, Nd, Nb | - | bearing capacity factors | |
sc, sd, sb | - | shape factors | |
ic, id, ib | - | inclination factors | |
gc, gd, gb | - | ground factors | |
bc, bd, bb | - | base factors | |
φ | - | angle of internal friction of soil | |
l | - | length of the foundation | |
δ | - | angle of deviation of the resultant force from the vertical direction | |
β | - | slope of the terrain | |
α | - | slope of the footing bottom | |
T | - | horizontal component of the resultant load | |
ω | - | angle between the horizontal component of resultant load T and the longer axis of footing (in the direction lef) |
* Note: The program performs analysis for both orientations of load inclination and uses more unfavourable value.
Orientation of load inclination
Literature:
DIN 4017:2006-03