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To provide the mining and tunnelling industries with a rock reinforcement fixture that is better suited to mining with high stress conditions, Atlas Copco has developed a new rockbolt that can accommodate both very large displacements and high energy release in the rock mass. The design principles that guided the development of the rockbolt are presented and discussed. For one, the Roofex® was designed to offer accurate pre-set load-deformation behaviour. This first model or prototype is based on a 12.5 mm diameter steel bar because of borehole diameter limitations.

Roofex® –Results of Laboratory Testing of a New Concept of Yieldable Tendon