GGU-UNDERPIN: Sliding safety
The sliding safety is calculated using
Vk = characteristic vertical force
Hd = design value of horizontal force
The friction angle 
is obtained from the mean of the soils in the base plane of the wall.
The sliding safety is calculated using
Vk = characteristic vertical force
Hd = design value of horizontal force
The friction angle is obtained from the mean of the soils in the base plane of the wall.