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.
|Number of pages||7|
|Journal||International Journal of Minerals, Metallurgy and Materials|
|Publication status||Published - 01 Jun 2011|
Innaurato, N., Oggeri, C., Oreste, P., & Vinai, R. (2011). Laboratory tests to study the influence of rock stress confinement on the performances of TBM discs in tunnels. International Journal of Minerals, Metallurgy and Materials, 18(3), 253-259. https://doi.org/10.1007/s12613-011-0431-z