Fig. 12

Shear and tensile failure in the rock bridge: (a) crushed material on the crack surface in the rock bridge region indicates a shear failure mode, and (b) a crack surface devoid of any crushed material signifies a tensile failure mode.

Shear and tensile failure in the rock bridge: (a) crushed material on the crack surface in the rock bridge region indicates a shear failure mode, and (b) a crack surface devoid of any crushed material signifies a tensile failure mode.