ABSTRACT
Shear test have been performed in a large shear rig on Swellex bolts, massive steel bolts, massive and tube bolts of fiber glass. The inclination of the bolts to a joint plane in jointed rock, the normal stress and the type of blocks for bolt installation were varied. Shear test results show that the modern tube bolts (Swellex and Split set bolts) allow larger shear displacements before failure than is the case with massive rock bolts. However, tube bolts show lower shear resistance than massive rock bolts for the same size of cross section area. The reinforceing capacity for tube bolts of fiber glass is less than that of steel bolts. The inclination of the bolt to the shear surface joint plane is found to have a strong influence on shear resistance and shear displacement before bolt failure. An inclination in which the bolt is loaded in shear and tension offer the maximum resistance to shear failure.
