Anchorage of Rock Slope
Two types of anchors can be defined when running the slope stability analysis on a plane slip surface:
Active
An active anchor is represented by a pre-stressed anchor, for which the anchor forces are activated before the sliding of a rock block takes place. The normal force Na increases the normal stress on a slip surface and as such also the resisting forces; the tangent component of the normal force Ta is either added to or subtracted from the shear (active) forces.
Resolution of active anchor force
Passive
A passive anchor is activated by sliding off a rock block (i.e. not pre-stressed anchors). The anchor bearing capacity Rt is added to the resisting (passive) forces.