Roberts, T & Dodds, A 2013, 'Design, development and testing of the JTech bolt for use in static, quasi-static and dynamic domains', in Y Potvin & B Brady (eds), Proceedings of the Seventh International Symposium on Ground Support in Mining and Underground Construction
, Australian Centre for Geomechanics, Perth, pp. 305-321.
Designing a rock reinforcement element requires knowledge of geomechanical behaviour, interaction of the reinforcement element with rock mass, and the element’s mechanistic response in static and dynamic environments. Using this knowledge, the JTech bolt was developed and subjected to a thorough program to test, gather data and validate the bolt performance in varying domains. By conducting finite element (FE) modelling, the simulation reviews the JTech bolt design evaluating the effects of threadbar geometric variation, threadbar and nut engagement results under high stress, coating friction response and effects of thread tolerance extremes on the failure mode. These results determine safety factors, tolerances and quality management criteria. Once manufactured, in situ system testing, laboratory and underground short encapsulation testing, resin mixing testing, double shear testing and dynamic testing at varying velocity and mass, determine the system’s capacity and effectiveness in static, quasi-static and dynamic mining environments. In this paper, the process and results are described.
Anderson, T. (2008) Design guidelines for the dynamic behaviour of ground support tendons, WSIB/RAC, Bridging the Gap, Section III Facilities and Procedures, pp. 60–65.
ACRS Compliance (2007) ACRS Compliance: your Assurance of Quality for OneSteel Rebar and Reomesh Processing, viewed 28 January 2013,
Jennmar (2013) Hard Rock Catalogue, Jennmar Australia, viewed 28 January 2013,
Plouffe, M., Anderson, T. and Judge, K. (2008) Rock bolts testing under dynamic conditions at CANMET-MMSL, in Proceedings 6th International Symposium on Ground Support in Mining and Civil Construction, T.R. Stacey and D.F. Malan (eds),
30 March–3 April 2008, Cape Town, South Africa, The Southern African Institute of Mining and Metallurgy, Johannesburg, pp. 581–595.