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Verification - Factor of Safety

The analysis checks whether a ratio of resisting and shear (driving) forces acting on a slip surface is greater than the input factor of safety.

A factor of safety on the input slips forces is thus provided by:

where:

G

-

gravity force

Sa,vert

-

vertical component of active pressure

Sa,hor

-

horizontal component of active pressure

di

-

length of  ith section slip surface

d

-

length of slip surface

Fh,n

-

bearing capacity of nth nail behind slip surface per 1 running meter

ci

-

cohesion of  ith soil layer

φi

-

angle o internal friction of ith layer

υ

-

inclination of slip surface

α

-

inclination of nails from horizontal direction