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.), 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
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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Darlington, B., Rataj, M., Balog, G., Barnett, B. 2018. Development of the MDX Bolt and in situ dynamic testing at Telfer Gold Mine. Proceedings of the 3rd international conference on Rock Dynamics and Applications (RocDyn-3) 2018. Li, C., Li, X. and Zhang, Z. (eds). CRC Press, Leiden. pp. 403-408.
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Player, J., Thompson, A., Villaescusa, E. 2008. Dynamic Testing of Reinforcing Systems. Proceeding of the 6th International Symposium on Ground Support in Mining and Civil Engineering Construction 2008. SAIMM, SANIRE and ISRM. pp. 597-622.
Potvin, Y., Wesseloo, J. 2013. Towards an understanding of dynamic demand on ground support. Proceedings of the Seventh International Symposium on Ground Support in Mining and Underground Construction 2013. Potvin, Y. and Brady, B. (eds). Australian Centre for Geomechanics, Perth. pp. 287-304.
Potvin, Y. 2017. The need for new technology to optimise the engineering of ground support systems in underground mines. Proceedings of the First International conference on Ground Mining Technology 2017. Potvin, Y. and Hudyma, M (eds). Australian Centre for Geomechanics, Perth.
Shirzadegan, S., Nordlund, E., Zhang, (2016). In situ dynamic testing of rock support at LKAB Kiirunavaara mine. Proceedings of the 8th International Symposium on Ground Support in Mining and Underground Construction 2016. Nordlund, E., Jones, T.H., and Eitzenberger, A. (eds). Lulea university of Technology, Sweden. pp. 515-526.
Shirzadegan, S., Nordlund, E., Zhang, P. 2016. Large Scale Dynamic Testing of Rock Support System at Kiirunavaara Underground Mine. Rock Mechanics and Rock Engineering (2016). 49:2773.
Stacey, T. 2012 .A philosophical view on the testing of rock support for rockburst conditions. Journal of the Southern African Institute of Mining and Metallurgy, vol. ISSN 2411-9717, 112, no. 8, pp. 703-710.
Stacey, T. 2018. A personal review of South African rockburst research, experience and lessons learnt. Proceedings of the 4th Australasian Ground Control in Mining Conference (AusRock 2018). The Australasian Institute of Mining and Metallurgy. pp. 5-16.
Villaescusa, E., Thompson, A., Player, J. 2005. Dynamic Testing of Rock Reinforcement Systems. Australian Mining Technology Conference 2005.