Kouhia, A, Penczek, R & Scolari, F 2024, 'Integrated solutions based on injectable bulk resin for fast and safe rockbolting', in P Andrieux & D Cumming-Potvin (eds), Deep Mining 2024: Proceedings of the 10th International Conference on Deep and High Stress Mining, pp. 607-620, https://doi.org/10.36487/ACG_repo/2465_36
(https://papers.acg.uwa.edu.au/p/2465_36_Scolari/)
Abstract: Integrated rockbolting means a coordinated R&D strategy aimed to optimise all elements involved in the process. The paper focused on fully grouted rockbolts where urea-silicate resin (USR) is the bonding medium between steel and surrounding rock. USR is delivered and stocked in large containers and can be injected into the hole by pumps via a static mixer. This paper analyses pre- and post-grout techniques used to inject USR in the hole and how these two systems can be applied to the two major rockbolting procedures, i.e. with mechanised bolting rigs or face drilling jumbos. USR can be used with different types of rockbolts, namely selfdrilling bolts, hollow bar bolts, solid rebar bolts and cable bolts. This paper discusses the advantages of using USR in all these applications, presenting results obtained in laboratory tests and field cases. In general, USR represents an opportunity to improve quality and quality control of rockbolting and therefore mine safety and offers the opportunity to reach better bolting productivity which is a smart way to decrease total operational cost in underground rock excavation.

Keywords: mechanised rockbolting, urea-silicate resin, injectable bulk resin, jumbo bolting, pre-grouting, post-grouting, total cost of operation