Laboratory tests to study the influence of rock stress confinement on the performances of TBM discs in tunnels
来源期刊：International Journal of Minerals Metallurgy and Materials2011年第3期
论文作者：N. Innaurato C. Oggeri P. Oreste R. Vinai
文章页码：253 - 259
摘 要：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.
N. Innaurato，C. Oggeri，P. Oreste，R. Vinai
DITAG, Politecnico di Torino, Corso Duca degli Abruzzi 24, Turin, Italy
摘 要：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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