Definitions for "rock bolt"
Keywords:  tunnel, drill, tensioned, bolt, steel
a steel bolt or cable secured into place in the roof or rib of a tunnel opening for the purpose of pinning layers of rock together
A tensioned bar or hollow cylinder, usually steel, that is inserted into a drill hole in the rock and anchored by an expansion shell anchor at one end and a steel face plate and a nut at the other end. The steel face plate is in contact with the rock surface.
A threaded steel rod placed in a drilled hole and tensioned to increase strength of rock masses.