Abstract

CROMPTON, B.R.  and  SHEPPARD, J.. A practical design approach for an improved resin-anchored tendon. J. S. Afr. Inst. Min. Metall. [online]. 2020, vol.120, n.1, pp.7-13. ISSN 2411-9717.  http://dx.doi.org/10.17159/2411-9717/845/2020.

The use of resin-grouted tendons is a common ground support practice in the mining industry, and various tendon designs are available. The support strength of a resin-grouted tendon is often constrained by the resin annulus between the tendon and the borehole. Effective mixing of the resin is typically achieved by ensuring the resin annulus does not exceed a specified maximum limit. Therefore, in some cases, the diameter of the tendon is dictated by the maximum allowable resin annulus and minimum diameter borehole that can be drilled and not by the support design requirements. Tendons with mastic resin capsules are prone to 'gloving' by the capsule packaging, thereby debonding the tendon from the borehole, and compromising the mixing of the resin surrounding the tendon. This paper documents a practical investigation into the effectiveness of typical resin tendon designs in large annulus installations, and the development of an improved tendon design for such cases.

Keywords : resin; rockbolt; annulus; mixing; voids; design.

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