Abstract
Stress conditions are critical in deep hard rock mining and significantly influence hard rock cuttability. The peak cutting force (PCF), cutting work (CW), and specific energy (SE) can reflect rock cuttability and determine the feasibility and saving of mechanized mining to some extent. In this paper, the influence of uniaxial lateral stress on rock cuttability was investigated by an indentation experiment on cuboid rock using a conical pick, and a theoretical model was proposed to analyze the PCF and associated factors. The PCF, CW, and SE were used as indices to measure hard rock cuttability. The regression analyses show that rock cuttability presents as decreasing followed by increasing as uniaxial lateral stresses increases. The theoretical model was established by simplifying rock fragments into three-dimensional ellipse cones, and a formula was derived based on the elastic fracture mechanics theory. The error between the calculated and experimental values is 3.8%, which confirms the accuracy of the prediction formula. Finally, rock fragmentation by using conical picks was successfully applied on the field mining stope by inducing high geostresses to promote adjustments in stress and improve ore-rock cuttability.
Highlights
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(1)
The influences of uniaxial lateral stress on rock cuttability have been investigated.
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(2)
The peak cutting force, cutting work and specific energy can reflect the rock cuttability.
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(3)
A new theoretical model has been proposed to analyze the peak cutting force.
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(4)
The rock fragmentation using conical picks was successfully applied in deep hard rock mining.
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Acknowledgements
The work described in this paper was supported by the National Natural Science Foundation of China (Nos. 52174099 and 51904333), and the Natural Science Foundation of Hunan Province (No. 2021JJ30842), for which the authors are very thankful.
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Wang, S., Sun, L., Li, X. et al. Experimental investigation and theoretical analysis of indentations on cuboid hard rock using a conical pick under uniaxial lateral stress. Geomech. Geophys. Geo-energ. Geo-resour. 8, 34 (2022). https://doi.org/10.1007/s40948-022-00345-x
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DOI: https://doi.org/10.1007/s40948-022-00345-x