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.

Laboratory tests to study the influence of rock stress confinementon the performances of TBM discs in tunnels / Innaurato, Nicola; Oggeri, Claudio; Oreste, Pierpaolo; Vinai, Raffaele. - In: INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS. - ISSN 1674-4799. - 18:3(2011), pp. 253-259. [10.1007/s12613-011-0431-z]

Laboratory tests to study the influence of rock stress confinementon the performances of TBM discs in tunnels

INNAURATO, Nicola;OGGERI, CLAUDIO;ORESTE, PIERPAOLO;VINAI, RAFFAELE
2011

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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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2495776
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