G S Littlejohn, BSc, PhD, MICE, MIStructE, FGS, and D A Bruce, BSc, AMICE, FGS. This paper was first published in GE’s May 1975 edition.
The history of prestressed rock anchors dates from 1934, when the late Andre Coyne pioneered their use during the raising of the Cheurfas Dam, in Algeria. Since then, the employment of rock anchors in dam construction has become world wide, and several million tons of working capacity have been successfully installed. Rock anchors have also been used for many years to ensure the safety of large underground excavations and the stability of natural and artificial rock slopes.