Abstract
To clarify some aspects of rock destruction with a disc acting on a high confined tunnel face, a series of tests were carried out to examine fracture mechanisms under an indenter that simulates the tunnel boring machine (TBM) tool action, in the presence of an adjacent groove, when a state of stress (lateral confinement) is imposed on a rock sample. These tests proved the importance of carefully establishing the optimal distance of grooves produced by discs acting on a confined surface, and the value (as a mere order of magnitude) of the increase of the thrust to produce the initiation of chip formation, as long as the confinement pressure becomes greater.
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Innaurato, N., Oggeri, C., Oreste, P. et al. Laboratory tests to study the influence of rock stress confinement on the performances of TBM discs in tunnels. Int J Miner Metall Mater 18, 253–259 (2011). https://doi.org/10.1007/s12613-011-0431-z
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DOI: https://doi.org/10.1007/s12613-011-0431-z