Abstract
A series of five large scale dynamic tests were conducted at the LKAB Kiirunavaara mine using explosives to generate the dynamic load on the support system. This was done with the aim of developing ...
Highlights
The problems induced by seismic events have necessitated implementing remedies to mitigate the associated seismicity risks
This paper presents the results from the development of a large scale dynamic testing method of rock support systems which uses blasting to generate the dynamic load
This was done by using different charge concentrations while the burden and explosive type was kept constant
Summary
The problems induced by seismic events have necessitated implementing remedies to mitigate the associated seismicity risks. Three measures that can reduce the seismicity risks are described as reducing exposure of personnel, changes to mine design, layout and extraction sequences, and using dynamically strong ground support systems (Potvin et al 2010). Using ground support systems which are capable of withstanding strong dynamic loads to minimise the associated damages and increase the safety at the work site has been shown to be most favourable. The conventional design approach of rock support essentially consists of (1) the identification of potential failure modes and (2) a comparison of the available capacity with the driving force/demand (including dynamic components). By calculating the factor of safety or the probability of failure, the demand on the rock support can be estimated. It has been concluded that it is impossible to design support systems under seismic loading conditions by using this approach, since neither the demand on a support system nor the capacity of a support system can be satisfactorily defined (Stacey 2012)
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