Abstract

VAN DER WALT, J.  and  SPITERI, W.. A conceptual technique to mathematically quantify the trajectory of flyrock. J. S. Afr. Inst. Min. Metall. [online]. 2023, vol.123, n.4, pp.165-173. ISSN 2411-9717.  http://dx.doi.org/10.17159/2411-9717/2168/2023.

Flyrock remains a significant threat to the health and safety of mine employees and integrity of infrastructure, as well as to the safety of the neighbouring communities and their property. This investigation was motivated by the general lack of fundamental research and mathematically quantifiable data in the literature regarding the relationship between blast design parameters and their impact on flyrock. The focus was to develop a concept that can be used to mathematically quantify the trajectory of flyrock resulting from a blast, which can be used for future research. The ultimate goal for this technique, once it has been fully developed, is to: > Enable mining operations to generate a database with accurate historical flyrock measurements resulting from their blasting operations > Allow research teams to conduct scientific investigations into flyrock and the impact of various blast design parameters > Generate point-cloud data to visualize blasts and flyrock in a virtual reality environment for training and education purposes. This paper summarizes a conceptual technique and preliminary fieldwork that was carried out to determine the technique's feasibility and motivate further development. The results show conclusively that a modified photogrammetric technique is capable of capturing flyrock data for further processing and analysis. The data acquisition procedure can, at this point, be used to meet the first aim of the project, namely to gather a field database of historical flyrock generation. Further development of the technique is ongoing and it is envisioned that the scientific-based technique will provide a method whereby future flyrock studies will be comparable and that assumptions will be limited.

Keywords : flyrock; prediction; trajectory; measurement; environmental blasting; blast analysis; blast damage.

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