Abstract
Methods of estimating dynamic-capable ground support requirements from first principles are limited by the complexities of seismic event mechanisms, the susceptibility of excavations to damage and the behaviour of ground support systems. Some of these complexities were bypassed at the Mt Charlotte gold mine by adopting an alternative site-specific empirical approach, based on underground observations of seismic damage and the performance of ground support. Relationships were derived between peak particle velocity due to seismicity, the energy absorption capacity of ground support systems, and the damage occurring in excavations. A ground support design chart was developed for dynamic situations to enable estimation of the minimum required energy absorption capacity for ground support. Alternatively, given a particular seismic event magnitude and location, the chart can be used to indicate likely ground support performance in dynamic situations, in terms of the expected damage to ground support. The chart has been successfully applied to assess dynamic ground support requirements in development used to mine remnants in the seismically active ROB5 stoping block. A key advantage of this empirical approach is that it is calibrated to the peculiarities of the specific mine site.
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