Bierman, IR, Gardner, L & Piper, P 2019, 'An evaluation of the bond strength of multiple resin bolt and capsule combinations through laboratory testing and applied methodologies ', 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. 175-190, https://doi.org/10.36487/ACG_rep/1952_14_Bierman
This paper describes the implementation of a methodology and test results to determine the performance capability of a combination of Ø 20 mm steel tendon resin bolts from ten separate suppliers, and Ø 32 mm resin capsules from four separate suppliers. The methodology chiefly describes the parameter of the selected hole diameter which was Ø 38 mm. Installing Ø 20 mm resin bolts inside Ø 38 mm holes results in an excessive annulus, which significantly reduces the bond strength of the installation. By conducting a programme of laboratory pull testing by combining each resin bolt and resin capsule installed inside steel tubes with Ø 38 mm internal diameter, the best combinations could be determined. The pull tests were supplemented by conducting similar installations inside Perspex tubes to provide visual observation of the installation process. In the laboratory, the test results showed that modified resin bolts provided the greatest resistance to pulling load with the least displacement. The modifications increased diameter of the penetrating end of the bolt, either by the addition of deformities to the steel, or by incorporating a helix into the design of the bolt profile. The work done addressed the need by Impala Platinum Limited (Impala Platinum) for effective resin bolt installations in large diameter holes.
Ferreira, P.H. (2012). A Perspective on Underground Support Technologies in Southern African Platinum Mines to Reduce Safety Risks and Enhance Productivity. Proceedings of the Fifth International Platinum Conference, ‘A Catalyst for Change’. The Southern African Institute of Mining and Metallurgy. Sun City, South Africa.
Gardner, L.J., Fox, M.H. and Conley, N.L. (2013). Selecting support for new mine development – a case study from Impala Platinum Ltd. Proceedings of the Seventh International Symposium on Ground Support in Mining and Underground Construction, Australian Centre for Geomechanics, Perth, pp. 411-420.
Zindi, L. (2008). No. 17 Shaft Project—Overcoming ‘Fourth Generation’ Technical Challenges. Proceedings of the Third International Platinum Conference, ‘Platinum in Transformation’. The Southern African Institute of Mining and Metallurgy. Sun City, South Africa.
Ulrich, B.F., Wuest, W.J. and Stateham, R.M. (1989). Relationships Between Annulus Thickness and the Integrity of Resin-Grouted Roof Bolts. Report of Investigations No. 9253. US Bureau of Mines Spokane Research Centre, Spokane, WA.
Bharti, S., Modi, J. and Kumar, R. (2014). Performance of Grouted Rock Bolts in Rock Mass. Proceedings of the National Seminar on Recent Trends in Mechanised Mining. Kothagudem, Telangana.
Snyman, W., Ferreira, P.H. and O’Connor, D. (2011). The New Generation Polyester Resin Capsule Support for Rock Bolt Solutions to the Mining Industry. Proceedings of the 6th Southern African Base Metals Conference. The Southern African Institute of Mining and Metallurgy. Phalaborwa, South Africa.
Canbulat, I., Wilkinson, A., Prohaska, G., Mnisi, M. and Singh, N. (2005). An Investigation into the Support Systems in South African Collieries. Report No. CR231/0205/SIM302. Safety in Mines Research Advisory Committee Project No. SIM 020205.
Pile, J., Bessinger, S., Mark, C. and Tadolini, S.C. (2003). Short Encapsulation Pull Tests for Roof Bolt Evaluation at an Operating Coal Mine. Proceedings of the 22nd International Conference on Ground Control in Mining. The National Institute for Occupational Safety and Health (NIOSH). West Virginia University, West Virginia, USA, pp. 226 – 232.
Campbell, R., Mould, R. and MacGregor, S. (2004). Investigation into the Extent and Mechanisms of Gloving and Un-mixed Resin in Fully Encapsulated Roof Bolts. Coal 2004: Coal Operators' Conference, University of Wollongong & the Australasian Institute of Mining and Metallurgy, pp. 203-214.
South African Bureau of Standards. (2018). SANS 1534: 2018 (Edition 2.0). Resin Capsules for Use with Tendon Based Support Systems. South African Bureau of Standards…