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

N. Innaurato, C. Oggeri, P. Oreste, R. Vinai

    Research output: Contribution to journalArticle

    24 Citations (Scopus)

    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.
    Original languageEnglish
    Pages (from-to)253-259
    Number of pages7
    JournalInternational Journal of Minerals, Metallurgy and Materials
    Volume18
    Issue number3
    DOIs
    Publication statusPublished - 01 Jun 2011

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