Excavation tool concepts for TBMs – Understanding the material-dependent response to abrasive wear

Küpferle, Jakob; Röttger, Arne; Theisen, W.

doi:10.1016/j.tust.2017.05.013

Cited by 33 publications

(15 citation statements)

References 13 publications

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“…On this basis it is thus possible to investigate the tribological system TBM-tool with its diverse system components. In this regard the authors can already refer to several publications, in which diverse tribological influential factors and interactions have been analysed successfully [7] [9] [12] [13].…”

Section: Discussionmentioning

confidence: 99%

“…dessen Ritzhärte korrelieren mit dem resultierenden Verschleiß im RUB-Tunnelling Device. Unter Berücksichtigung weitreichender rasterelektronenmikroskopischer Untersuchungen und Analysen [13] kann somit davon ausgegangen werden, dass der abrasive Oberflächenabtrag in diesem Versuch ebenfalls primär durch Furchungsverschleiß hervorgerufen wird.…”

Section: Discussionunclassified

“…The scratch resistance of the material dependent microstructure and its scratch hardness correlate with the resulting wear in the RUB Tunnelling Device. Considering extensive investigations with the scanning electron microscope and analyses [13], it can thus be stated that abrasive removal of material from the surface in this test is also primarily due to grooving wear.…”

Section: Ergebnisse Und Diskussionmentioning

confidence: 99%

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Tribological analysis of the TBM tool wear in soil from the view of material science

Küpferle

Röttger

Theisen

et al. 2018

Geomechanics and Tunnelling

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Excessive wear to excavation tools leads to unplanned downtime, which results in additional costs. To predict tool wear during the planning phase of a project, an analysis of the acting tribological system is essential. The different influential factors and interactions have to be considered. The abrasive surface degradation of tools is investigated on a microstructural scale with nano‐scratch experiments. Material‐dependent variables like hard phase content and size are discussed in terms of the resulting wear‐resistance. Using the RUB Tunnelling Device, abrasive surface degradation can be investigated on a more global scale and correlated with the acting tribological system, and the different tribological system components and influential factors can be considered.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionunclassified

Section: Ergebnisse Und Diskussionmentioning

confidence: 99%

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Tribological analysis of the TBM tool wear in soil from the view of material science

Küpferle

Röttger

Theisen

et al. 2018

Geomechanics and Tunnelling

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“…Although shield TBMs have been widely used in soft ground tunneling, cutting tool wear is still one of the uncertainties restricting construction efficiency (Küpferle et al 2017(Küpferle et al , 2018. In particular, for long-distance cross-river tunnels, cutterhead inspection and tool maintenance under the extreme working conditions encountered are difficult, high-risk, and time-consuming but necessary procedures (Alavi Gharahbagh et al 2011Gharahbagh et al , 2014aRostami et al 2012;Barzegari et al 2014).…”

Section: Introductionmentioning

confidence: 99%

An experimental study on cutting tool hardness optimization for shield TBMs during dense fine silty sand ground tunneling

Zhang

Tang

Liu

et al. 2021

Bull Eng Geol Environ

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The estimation of soil abrasivity and cutting tool wear during soft ground tunneling is complicated and arduous work due to the lack of a generally accepted testing system. To date, geotechnical baseline reports (GBRs) and geotechnical data reports (GDRs) still cannot provide reliable soil abrasion indices for tool life prediction. This is considered a deficiency in the geotechnical investigation of shield-driven tunnel projects. In this study, the Multifunctional Shield Test System (MSTS) developed by the Key Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province at Wuhan University is presented. The MSTS was motivated by the need for a test platform with the ability to simulate undisturbed soil conditions and actual tool working environments to explore the mechanism of cutting tool wear, bentonite slurry penetration, and filter cake formation in various geomaterials with grain sizes including clay, silt, sand, and gravel (< 15 mm). Experimental studies on the effect of alloy hardness on cutting tool wear are conducted. The soil samples used in the tests are dense fine silty sand from the Sutong GIL Yangtze River Crossing Cable Tunnel. When the wear extent is plotted against the alloy hardness, an inverted S-shaped band bounded by the highest and lowest alloy hardnesses is formed. The sensitive hardness interval is HRC = [47, 52]. If the alloy hardness is higher than 52 HRC, the wear extent is relatively small. Since alloy hardness is negatively correlated with bending strength, using a cutting tool material with a hardness slightly higher than the upper limit of the sensitive hardness interval is optimal. Thus, an alloy with a hardness interval of HRC = [52, 63] is recommended for the dense fine silty sand ground at the Sutong GIL Yangtze River Crossing Cable Tunnel. Keywords Cutting tool wear • Alloy hardness • Soil abrasivity • Testing system • Soft ground tunneling Terms HardnessThe ability of a material to resist hard objects pressed into its surface locally Relative hardnessThe ratio of the hardness of one material to that of another Sensitive hardness interval The hardness interval in which the wear extent decreases significantly as the hardness increases Sensitive relative hardness intervalThe relative hardness interval in which the wear extent decreases significantly as the hardness increases * Xiao-Ping Zhang

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“…During operation, steel substrates absorb the mechanical loads and divert them into adjacent subassemblies, whereas the surface of these substrates is protected against abrasion by the applied wear-protection layers. 3 For soil excavation in mechanized tunnelling, chisels, scrapers and, in some cases, cutting discs are used as tools. In this case, soil erosion in loose rock can be described by 'scraping' at the tunnelling face by the chisels.…”

Section: Introductionmentioning

confidence: 99%

Subcritical crack growth in hard alloys under cyclic loading

Brackmann

Röttger

Weber

et al. 2020

Fatigue Fract Eng Mat Struct

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In this work, the subcritical crack growth in Fe‐, Ni‐ and Co‐base hard alloys was investigated. Specimens were cyclically loaded in the pressure threshold range until a ring crack resulted as a failure criterion. Crack propagation along with the individual microstructural constituents and the associated resistance of the individual materials to crack propagation was investigated by scanning electron microscopy and by the methods adapted to it. For the Ni‐base alloys, the formation of a closed ring fracture occurred after the lowest load cycle number, followed by the Co‐ and Fe‐base alloys. Almost no crack deflection by the hard phases was detected in the Ni‐base alloys. The higher number of loading cycles to produce a closed crack ring in the Fe‐base alloys is attributed to the pronounced crack deflection by the hard phases and to the higher matrix strength. Besides, phase transformations were registered in front of the crack tip of the Co‐ and the partially austenitic Fe‐base alloy. This phase transformation counteracts crack formation in the case of the Fe‐base matrix but promotes crack propagation in the Co‐base alloy.

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Excavation tool concepts for TBMs – Understanding the material-dependent response to abrasive wear

Cited by 33 publications

References 13 publications

Tribological analysis of the TBM tool wear in soil from the view of material science

Tribological analysis of the TBM tool wear in soil from the view of material science

An experimental study on cutting tool hardness optimization for shield TBMs during dense fine silty sand ground tunneling

Subcritical crack growth in hard alloys under cyclic loading

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