How is soil nail capacity computed when both tension and shear options are selected?

Slide computes a support force vector for tensile failure and for shear failure independently of each other.  It then adds the tensile force vector to the shear force vector to get a total support force vector.  Note that this vector has both magnitude and direction, and therefore you cannot simply add the nail force diagrams together.  Since the shear force acts in a different direction to the tensile force, you end up with a resultant vector.  Slide shows the magnitude of this resultant vector in the nail force diagram for shear and tension.

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Illustration of Shear Capacity option for support