Development and Validation of Universal 3D Blast Fragmentation Model

Author:

Lapčević Veljko1ORCID,Torbica Slavko2,Stojanović Miloš3,Vojinović Ivica3

Affiliation:

1. Faculty of Mining and Geology, University of Belgrade, Ðušina 7, 11000 Belgrade, Serbia

2. Owl & Fox—Mining Consultants, Cara Dušana 67/3, 11000 Belgrade, Serbia

3. Mining and Metallurgy Institute Bor, Zeleni Bulevar 35, 19210 Bor, Serbia

Abstract

The dominant technology in hard rock mining is drilling and blasting; therefore, the importance of fragment size estimation is an essential problem in the mining industry. By using a theoretical foundation that explains rock-fracturing mechanisms by blasting, a 3D fragmentation model with general applicability was developed. The main capabilities of the model are the ability to consider different and complex blasting patterns, both with parallel and non-parallel boreholes, and different explosive and rock properties. The geological input of the model is defined by generating the primary blocks within rock mass using discrete fracture networks. The model handles different, complex geological setups and blasting scenarios that include bench, ring, and tunneling blasting. Also, it considers borehole deviation, misfires, and the influence of previous blasts. Full-scale ring blasts were carried out to validate the model against real-world data, and the results showed a high level of agreement between model predictions and in situ data. In situ data were collected using image processing methodology and WipFrag v4 software. X50 and X80 size values showed a maximum error in prediction of around 15%, while R2 values between fragmentation curves were approximately 90% without a detailed model calibration to the obtained data.

Publisher

MDPI AG

Subject

Fluid Flow and Transfer Processes,Computer Science Applications,Process Chemistry and Technology,General Engineering,Instrumentation,General Materials Science

Reference34 articles.

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2. Effects of joint orientation and rock mass quality on tunnel blasting;Chakraborty;Eng. Geol.,1994

3. Hyldahl, J. (2018). Effects of Jointing on Fragmentation: Design and Influence of Joints in Small Scale Testing, Luleå University of Technology.

4. Cunningham, C. (1983, January 23–26). The Kuz-Ram model for prediction of fragmentation from blasting. Proceedings of the 1st International Symposium on Rock Fragmentation by Blasting, Luleå, Sweden.

5. Cunningham, C.V.B. (1987, January 23–26). Fragmentation estimations and the Kuz-Ram model-four years on. Proceedings of the 2nd International Symposium on Rock Fragmentation by Blasting, Keystone, CO, USA.

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