Author(s)

A. Ansell

Abstract

Dynamic loads on underground structures, such as tunnels, may be caused by blasting during nearby construction work or bomb detonations on the surface above e.g. a rock shelter. These loads give rise to vibrations that propagate as stress waves through the rock, possibly causing damage to structures and installations or even causing fragments or pieces of rock to be thrown out from the rock surface. A common and important energy absorbing component in rock support is steel rock bolts. A new type of energy absorbing rock bolt has been developed and dynamically tested. The bolt consists of a smooth steel bar with impressions made over a section of its length to provide required anchorage when fully grouted. When subjected to a dynamic load, the adhesive bond between bar and surrounding grout is lost and the

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