caa a22 4500 469042958 CHVBK 20180323132816.0 cr unu---uuuuu 170328e19920301xx s 000 0 eng 10.1007/BF00881969 doi (NATIONALLICENCE)springer-10.1007/BF00881969 Wijk G. Atlas Copco Tunnelling and Mining AB, S-105 23, Stockholm, Sweden aut A model of tunnel boring machine performance [Elektronische Daten] [G. Wijk] Summary: A mathematical model for the performance of a tunnel boring machine (TBM) is presented. In particular an equation for the TBM cutter wear is proposed. The rock mechanics are described via simple strength parameters and the Cerchar abrasivity index (CAI). Thus one obtains a complete description of TBM tunnelling with instantaneous and accumulated values for the tunnelling rate, the tool consumption, the costsetc. as output parameters when the tunnelling proceeds through rock with variable properties (strength and CAI). Two different types of cutter tools are considered, namely wedge-shaped tools and constant wear flat tools. For wedge-shaped tools the tunnelling costs are shown to be minimized if old tools are replaced by new tools when a certain wear flat tool has been reached. Similarly there is an optimum design (=wear flat) for the constant wear flat tools. Chapman & Hall, 1992 Tunnel boring nationallicence rock mechanics nationallicence cutter wear nationallicence tunnelling costs nationallicence A : Projected disc cutter contact area, m2 nationallicence b : Button contact area radius, m nationallicence $$\bar b$$ : Equivalent button contact area radius, m nationallicence B : Tunnelling rate, m s−1 nationallicence C : Tunnelling cost, money m−1 nationallicence D : Tunnel diameter, m nationallicence d : Disc cutter diameter, m nationallicence E : Number of replaced TBM tools nationallicence F : Disc cutter thrust force, N nationallicence F ST : Stamp Test force, N nationallicence G : TBM thrust force, N nationallicence H : Wear height for constant wear flat tool, m nationallicence h : Wear height for wedge-shaped tool, m nationallicence i : Index nationallicence L : Disc cutter rolling length, m nationallicence M : TBM capital cost, money m−1 nationallicence N : Number of TBM tools nationallicence n : TBM rotation rate, rps nationallicence N p : Number of TBM tools at the periphery nationallicence P : Disc cutter rolling force, N nationallicence r : Index nationallicence R : Tools cost, money nationallicence s : Rock joint spacing, m nationallicence S : Rock joint spacing parameter, m nationallicence T : TBM torque, Nm nationallicence t c : Time to change a tool, s nationallicence V ST : Stamp Test volume, m3 nationallicence w : Disc cutter wear flat, m nationallicence W : TBM rotation power, W nationallicence x : Disc cutter penetration depth, m nationallicence x ST : Stamp Test penetration depth, m nationallicence Z : Tunnel length, m nationallicence z : Radial distance between TBM tools nationallicence α : Time factor for maintenance and repair nationallicence β : Disc cutter tool bluntness, m nationallicence ϕ : Auxiliary parameter nationallicence κ : Auxiliary disc cutter wear coefficient, m−2 nationallicence λ : Disc cutter rolling length, m nationallicence μ : Friction coefficient nationallicence Ψ : Auxiliary angle parameter nationallicence ρ : Disc cutter edge radius, m nationallicence Σ : Disc cutter wear coefficient, Pa2 m−1 nationallicence σ C : Uniaxial compressive rock strength, Pa nationallicence σ PLT : Point Load Test index for tensile rock strength, Pa nationallicence σ ST : Stamp Test rock strength, Pa nationallicence σ T : Uniaxial tensile rock strength, Pa nationallicence 2 θ : Wedge-shaped disc cutter edge angle nationallicence η : TBM thrust utilization efficiency nationallicence ω : Auxiliary parameter nationallicence ζ : Disc cutter edge penetration depth, m nationallicence Geotechnical & Geological Engineering Kluwer Academic Publishers 10/1(1992-03-01), 19-40 0960-3182 10:1<19 1992 10 10706 https://doi.org/10.1007/BF00881969 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00881969 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Wijk G. Atlas Copco Tunnelling and Mining AB, S-105 23, Stockholm, Sweden aut NATIONALLICENCE 773 0- Geotechnical & Geological Engineering Kluwer Academic Publishers 10/1(1992-03-01), 19-40 0960-3182 10:1<19 1992 10 10706 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer