PAPER: Dynamic Testing of Friction Rock Stabilisers
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Player, J., Villaescusa, E., Thompson, A. G., 2009
Paper 4027 – Rock Engineering in Difficult Conditions, 3rd Canada-US Rock Mechanics Symposium & 20th Canadian Rock Mechanics Symposium, Toronto, May 2009
ABSTRACT:
An extensive axial test program has been used to quantify the difference between the static and dynamic capacities (kN/m of embedment) for friction rock stabilisers once sliding starts. Rough simulated boreholes have been developed for the installation and dynamic testing of rock bolts at the WASM Dynamic Test Facility. The rough simulated borehole is used for rock bolts that are sensitive to equipment installation technique or borehole geometry (particularly friction rock stabilisers and resin-encapsulated bolts).
The 47mm split tube bolt has a 50% reduction in embedment capacity (but with significant variation) dissipating 2.7kJ/100mm of sliding per metre of embedment, and the Omega (inflatable) bolt had a 70% reduction in embedment capacity dissipating 6.2kJ/100mm of sliding per metre of embedment. The Omega bolt dynamic capacity remained at least equivalent to the split tube bolt static capacity.
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