As far as the working mechanism of a rock nail is concerned, the strains of the rock induce a stress state in the nail composed of shear and traction stress, due to the roughness of the joints, to their opening and to the direction of the nail, generally non-orthogonal to the joint itself.
The functioning mechanism of a rock nail involves the strains in the surrounding rock inducing a stress state in the nail, characterized by shear and frictional components, resulting from the roughness of the joints, their opening, and the orientation of the nail relative to the joint.