ABSTRACT
This paper starts with a brief chronicle of rock reinforcement by bolts. It traces the development and theory behind the different types of roof bolting principles and their mechanisms. Two case studies are reviewed and the effectiveness of each bolting principle in regard to geotechnical data are analyzed. Results of the above case studies demonstrate that no particular roof reinforcement system is a cure for all geologic and mining conditions. Hence roof reinforcements may require combined effects of the mechanisms offered by more than one rock reinforcement system.
