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Cantilever Wall 

GEO5

Geotechnical software

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Verification - factor of safety

After computing forces acting on the structure the program determines the overall vertical and horizontal forces Fv and Fh, computes the forces acting in the footing bottom (normal force N and tangent force T):

Forces acting on the footing bottom

Next the program performs verification for overturning stability and translation. 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: (the moment rotates around the point B of the wall - see picture)

where: Movr - overturning moment
Mres - resisting moment
FS - factor of safety against overturning

Check for slip:

where: N - normal force acting in the footing bottom
φ - angle of friction structure of soil
c - cohesion structure-soil
d - width of wall heel
e - eccentricity
Τ - coefficient of overall stability of structure
FS - factor of safety against translation

where eccentricity e:

where: Movr - overturning moment
Mres - resisting moment
N - normal force acting in the footing bottom
d - width of wall heel

The "Settings" frame serves to assign the factors of safety FS (standard values are set to 1,5).




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