Rockburst risk is an increasing problem in underground mining worldwide, as the general trend is for mines to operate in deeper environments. In most mines affected by seismicity, the first line of defence to mitigate the potential consequences of rockburst is to install dynamic resistant ground support systems. The assessment of ground support capacity when submitted to dynamic loading has been the subject of intensive research over the last two decades. In particular, drop tests were developed to investigate the capacity of support elements while the performance of various support systems was examined by simulating rockbursts with carefully designed blasts. The above research has yet to yield an accepted method to determine the dynamic capacity of ground support. In this paper, the published results from many of the above tests are compiled and practical observations are made regarding the dynamic capacity of ground support systems.
Rockburst risk is an increasing problem in underground mining worldwide, as the general trend is for mines to operate in deeper environments. In most mines affected by seismicity, the first line of defence to mitigate the potential consequences of rockburst is to install dynamic resistant ground support systems. The assessment of ground support capacity when submitted to dynamic loading has been the subject of intensive research over the last two decades. In particular, drop tests were developed to investigate the capacity of support elements while the performance of various support systems was examined by simulating rockbursts with carefully designed blasts.The above research has yet to yield an accepted method to determine the dynamic capacity of ground support. In this paper, the published results from many of the above tests are compiled and practical observations are made regarding the dynamic capacity of ground support systems.
The HEA Mesh is a new surface support product currently under market development in Australia. It has been specifically designed to absorb energy from dynamic loading induced by large seismic events, but it is also suitable for application in very poor ground conditions where high convergence and squeezing ground are experienced. The HEA Mesh is an adaptation of the South African cable lacing technique which allows for the mechanised installation of pre-fabricated sheets of weld-mesh overlaid with a cable tendon pattern.Recently, a dynamic loading test was organised in a Western Australian underground mine to quantify the energy absorption capacity of the HEA Mesh under dynamic loading conditions. The results from these tests are also compared with results obtained from other surface support that has undergone a similar testing procedure. The procedure is known as the simulated rockburst technique. In simulated rockbursts, dynamic loads are generated using controlled blasts designed to deliver strong ground motion at the wall of a drive, whilst minimising the effect of the gas expansion. Although it is recognised that the dynamic loading characteristics from blasting differs from the dynamic loading of a far field seismic event, it has the significant advantage of testing the entire support system (reinforcement and surface support), and its interaction with the deforming rock mass under real conditions.
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