Testing And Modelling On An Energy Absorbing
Rock Bolt
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
Keywords
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