Abstract
Raises are vertical or inclined openings made to connect two levels of an underground metalliferous mine. They are developed using drilling and blasting-based technique or by mechanical means. Raise boring machines (RBM) have evolved in recent years, which provide quicker and safer raise excavation. The penetration rate using RBM has influenced applied thrust. The required thrust to enhance penetration rate with optimal use of energy would be different under varying geological and geotechnical conditions. In this study, the influence of applied thrust on penetration rate using RBM has been investigated. The investigation has been made for two different rock types, amphibolite (AMP) and garnet-biotite-sillimanite-gneiss (GBSG). The numerical simulation model was developed for this purpose using Ansys-Explicit Dynamics. The induced tensile stress under different conditions of applied thrust has been analysed in the calibrated numerical model. The model output shows the power trend between the parameters. The experimental data on penetration rate was also collected along with the respective operational parameters. A statistical analysis has been carried out for the gathered data. The analysis of data also shows a power trend between thrust per cutter and penetration rate in both rock types and hence validates the numerical simulation-based output. Based on the outputs of the numerical simulation and empirical study of the experimental data, the optimum thrust per cutter for excavation in both rock types is in the range of 12–14 tons. The approach used in this study can be helpful for predicting the optimal operational parameters of raise boring machines under different geological/geotechnical conditions.
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Data Availability
The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgements
The authors would like to thank the Director, CSIR-Central Institute of Mining and Fuel Research, India, and mine management of Rampura Agucha Underground Mine of M/s Hindustan Zinc Limited for giving permission and necessary support for conducting the investigations. This paper forms a part of the M.Tech. Dissertation work carried out at IIT(ISM) Dhanbad by the first author.
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Ashish K Vishwakarma: field experiment, numerical simulation, data analysis and manuscript preparation. V.M.S.R. Murthy: conceptualisation, methodology, scientific inputs. Vivek K Himanshu: numerical simulation, conceptualisation. Amar Prakash: supervision, review and editing. S. Mehrotra: field investigation, data collection.
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Vishwakarma, A.K., Murthy, V.M.S.R., Himanshu, V.K. et al. Investigations on the Influence of Applied Thrust on Rock Penetration Rate by a Raise Boring Machine Using Numerical Simulation and Experimental Trials. Mining, Metallurgy & Exploration 40, 1187–1197 (2023). https://doi.org/10.1007/s42461-023-00779-1
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DOI: https://doi.org/10.1007/s42461-023-00779-1