A new method to evaluate dynamic bolts and the development of a new dynamic rock bolt

Authors: Darlington, B; Rataj, M; Roach, W

DOI https://doi.org/10.36487/ACG_rep/1952_16_Darlington

Cite As:
Darlington, B, Rataj, M & Roach, W 2019, 'A new method to evaluate dynamic bolts and the development of a new dynamic rock bolt', in W Joughin (ed.), Deep Mining 2019: Proceedings of the Ninth International Conference on Deep and High Stress Mining, The Southern African Institute of Mining and Metallurgy, Johannesburg, pp. 205-216, https://doi.org/10.36487/ACG_rep/1952_16_Darlington

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Abstract:
Until science advances our current understanding of the demands and capacity of ground support, empirical design, rather than scientific methods, must be used. When considering ground support capacity, the industry has developed a significant database of laboratory dynamic tests on rock bolts. However, a methodology has not yet been developed to translate these laboratory test results into the in situ dynamic capacity of ground support systems. Recent development and implementation of in situ testing of dynamic bolts, provides a significant improvement in evaluation and interpretation of test results. In situ testing is carried out using a portable dynamic test rig (DTR), which simulates a seismic event through a dynamic impulse applied to a test bolt. This new tool also provides an opportunity to study the effects of mining progression on bolt performance. The DTR was utilised to test the recently developed D47 MDX bolt. The 47 mm diameter MDX bolt was tested at various hard rock mines in Australia with a typical 25 kJ dynamic impulse, causing bolt displacement typically between 100mm to 150 mm.

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