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levels, stress levels increase rapidly. This compromises the effectiveness of support systems and the stability of excavations underground (Ortlepp, 1992). Excavations driven into highly stressed ground typically suffer from stress-induced damage (Mühlhaus, 1990; McCreath and Kaiser, 1992; Maxwell, and Young, 1997; Daehnke et al., 1998). Stress-induced damage can result from either the creation of new fractures or the reactivation of existing fractures in the rock mass (Brady and Brown 1993). As a result of these challenges, rock support systems for underground excavations have changed significantly due to improved technologies and experience gained (Ortlepp, 1992; Jager and Ryder, 1999)

Trials of the Garford hybrid dynamic bolt reinforcement system at a deep-level gold mine in South Africa