Resumo

MAEPA, T.G.  e  ZVARIVADZA, T.. Installation of resin-grouted rockbolts in hard rock mining: challenges and solutions for improved safety. J. S. Afr. Inst. Min. Metall. [online]. 2017, vol.117, n.4, pp.329-336. ISSN 2411-9717.  http://dx.doi.org/10.17159/2411-9717/2017/v117n4a3.

The creation of mine excavations alters the stress distribution in the surrounding rock mass. In modern mining, resin-grouted rockbolts are used as a means of support in order to redistribute stresses and reestablish equilibrium in the rock mass. The success of resin-grouted rockbolting depends on the design of the system and the correct installation of the support units. The support design and rockbolt installation procedure at a platinum mine in the Bushveld Complex were investigated. A number of issues that resulted in poor installation were identified, including resin admixture, incorrect length and orientation of support holes, over- or under-spinning of the resin, and incorrect rockbolt tensioning. The support design used at the mine was reviewed and its limitations identified. A number of recommendations were made for optimizing the support design by reducing the diameter of the drill bit and reducing the length of the support holes. These changes will enable the mine to use different combinations of resin capsules. Implementation of the proposed changes will lead to a significant reduction in the cost of installation per support hole, as well as improve productivity and safety.

Palavras-chave : resin-grouted rockbolts; hard rock mining; installation procedure; safety; optimization; cost saving.

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