GGU-CANTILEVER: Bearing capacity safety

The program analyses the bearing capacity safety to DIN 4017.

In the case of stratified subsoil, the soil parameters can be averaged above the bearing capacity failure plane in accordance with DIN 4017, which is composed of the two linear components of a logarithmic spiral. The governing parameters are summarized in the following figure:

The mean governing soil properties are determined using the following relationships:

cal tan φ = Σ tan φ _i · l_i’ / Σ l_i
cal c= Σ c_i · l_i’ / Σ l_i
cal γ₂ = Σ γ_2i · A_i’ / Σ A_i

l_i = length within individual layer
A_i = area of individual layer

The condition for the permissibility of the mean is that the mean friction angle demonstrates a maximum deviation of 5° to the true friction angles. This condition can be checked by the program. If it is not adhered to, the program reduces the largest friction angle in stages until the condition is met.