IMPLEMENTATION OF THE GARFORD DYNAMIC BOLT AT KANOWNA BELLE MINE

摘要

Kanowna Belle is a high risk seismically active mine, the introduction of the Garford Dynamic bolt has given confidence to the design and control of this seismic risk through the specific engineered design of the bolt. Since the introduction of the bolt there has been a significant learning curve resulting in a well installed bolt in a high seismic risk environment. The paper starts with a summary of the bolt design processes, first reported in [5] then moves on to the implementation of the bolt and learning's over the past few years. The concept of placement of the bolt is to target high risk seismic areas, these being mainly when development intersects structures and in ore drive development ahead of a sloping front. The majority of bolts placed to date are in the lower part of the mine where stoping is not yet advanced and no significant events have occurred, only one significant event has occurred close to an area supported with Garford Dynamic bolts, but little damage occurred. From overcoring of the Garford Dynamic bolt it has been deduced that the dynamic mechanism does work, but is dependent on installation and resin mixing quality.