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

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. 作者： Author： N. lnnaurato  C. Oggeri  P. Oreste  R. Vinai 作者單位： DITAG, Politecnico di Torino, Corso Duca degli Abruzzi 24, Turin, Italy 期 刊： 礦物冶金與材料學(xué)報   EISCI Journal： International Journal of Minerals,Metallurgy and Materials 年，卷(期)： 2011, 18(3) 分類號： U451.2 Keywords： tunnels    boring machines    rock mechanics    stress analysis    機標(biāo)分類號： U45 TP3 機標(biāo)關(guān)鍵詞： TBM    stress    rock    influence    tunnel boring machine    confined    chip formation    fracture    examine    aspects    action    order    long    high    face 基金項目： Laboratory tests to study the influence of rock stress confinement on the performances of TBM discs in tunnels[期刊論文]  礦物冶金與材料學(xué)報 --2011, 18(3)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 tunn...

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