Verification - Safety Factor
The program evaluates normal and shear force in the footing bottom and then verifies the wall against overturning and sliding. For walls with a flat footing bottom and specified jump it is possible to account for the wall jump either in the form of pressure acting on the front face or by considering a wall with an inclined footing bottom.
Check for overturning stability:
where: | Movr | - | overturning moment |
Mres | - | resisting moment | |
SFo | - | safety factor for overturning |
Check for slip:
where: | N | - | normal force acting in the footing bottom |
φ | - | angle of internal friction of soil | |
c | - | cohesion of the soil | |
d | - | width of wall heel | |
e | - | eccentricity | |
H | - | shear force acting in the footing bottom | |
Fres | - | resisting force (from georeinforcement and mesh overlap) | |
SFs | - | safety factor for the sliding resistance | |
µ | - | reduction coefficient of the contact base - soil |
where eccentricity e:
where: | Movr | - | overturning moment |
Mres | - | resisting moment | |
N | - | normal force acting in the footing bottom | |
d | - | width of wall heel |
Horizontal components of forces are included in the shear force and overturning moment, vertical components of forces are included in the normal force and resisting moment. The resisting forces and moments also include horizontal forces from georeinforcements and overlapping meshes. The uplift pressure is considered in the overturning moment.