Laboratory tests to study the influence of rock stress confinement on the performances of TBM discs in tunnels |
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Authors: | N Innaurato C Oggeri P Oreste R Vinai |
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Institution: | (1) Department of Land, Environmental and Geotechnology Engineering, Politecnico di Torino, Turin, Italy; |
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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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Keywords: | |
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