A Fragmentation Modelling Framework for Underground Ring Blasting Applications

Author: I. Onederra

Source: Fragblast, Volume 8, Number 3, September, 2004 , pp. 177-200(24)

Publisher: Taylor and Francis Ltd

Abstract:

Empirical approaches for predicting fragmentation from blasting continue to play a significant role in the mining industry in spite of a number of inherent limitations associated with such methods. These methods can be successfully applied provided the users understand or recognize their limitations. Arguably, the most successful empirical based fragmentation models have been those applicable to surface blasting (e.g., Kuz-Ram/Kuznetsov based models). With widespread adoption of fragmentation assessment technologies in underground operations, an opportunity has arisen to extend and further develop these type approaches to underground production blasting. This paper discusses the development of a new fragmentation modelling framework for underground ring blasting applications. The approach is based on the back-analysis of geotechnical, blasting and fragmentation data gathered at the Ridgeway sub level caving (SLC) operation in conjunction with experiences from a number of surface blasting operations. The basis of the model are, relating a peak particle velocity (PPV) breakage threshold to a breakage uniformity index; modelling of the coarse end of the size distribution with the Rosin-Rammler distribution; and modelling the generation of fines with a newly developed approach that allows the prediction of the volume of crushing around blastholes. Preliminary validations of the proposed model have shown encouraging results. Further testing and validation of the proposed model framework continues and the approach is currently being incorporated into an underground blast design and analysis software to facilitate its application.

Keywords: fragmentation; underground blasting; back analysis; sublevel caving surface blast

Document Type: Research article

DOI: http://dx.doi.org/10.1080/13855140412331333262

Affiliations: 1: Julius Kruttschnitt Mineral Research Centre, The University of Queensland Brisbane Qld Australia

Publication date: 2004-09-01

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