Analysis of Force Path Diagrams of Linear Cutting Machine–Tests Regarding Geotechnical Parameters

Entacher, Martin; Lassnig, Klaus; Galler, Robert

doi:10.1061/9780784412121.333

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…TBM-rock interactions including disc cutter-rock interaction and bottom shield-rock mass nonlinear contact are mainly responsible for the vibration of TBM. These interactions correlate with a number of factors such as geotechnical parameters, cutter geometry, indentation, cutterhead rotation speed, and distribution of cutters on cutterhead [4,8]. The asymmetric distribution of cutter easily results in large side force and further leads to strong vibration of TBM in the direction perpendicular to the axis of the tunnel [4].…”

Section: Tbm-rockmentioning

confidence: 99%

“…Owning to complex TBM-rock interactions, the rock cutting force loaded by disc cutter is nonlinear and irregular and oscillates violently [2,3,7,8]. Under multipoint impact excitation from cutters, TBM vibrates strongly, premature failure of cutters and serious damage in cutterhead driving system occur frequently, and excavation energy efficiency declines, resulting in the increase of tunneling project expense [8,9]. There is no doubt that these sufferings of TBM performance have a close correlation with TBM-rock interactions.…”

Section: Introductionmentioning

confidence: 99%

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Performance Evaluation of Hard Rock TBMs considering Operational and Rock Conditions

Zou

Zheng

2018

Shock and Vibration

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This paper focuses on studying the correlations of the performance of hard rock tunnel boring machines (TBMs) with operational and rock conditions. Firstly, a rigid-flexible coupled multibody dynamic model of an opening hard rock TBM is established for the analysis of its vibration. Then four performance indexes including mean vibration energy dissipation rate, dynamic specific energy (DSE), disc cutter wear rate, and load sharing coefficient are introduced and formulated, respectively, for evaluating the vibration level, excavation energy efficiency, cutter’s vulnerability to wear, and load transmission performance of cutterhead driving system of the TBM. Finally, numerical simulation results of the TBM tunneling performance evaluation are obtained and validated by on-site vibration measurement and tunneling data collection. It is found that operational and rock conditions exert important impact on TBM vibration level, excavation energy efficiency, and structure damage. When the type of rock to be cut changes from soft to hard with operational parameters held constant, TBM performance evaluated by these three indexes deteriorates significantly, and both the decrease of excavation energy efficiency and the increase of cutter wear rate caused by TBM vibration are obvious. This study provides the foundation for a more comprehensive evaluation of TBM performance in actual tunneling process.

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Section: Tbm-rockmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Hard Rock TBMs considering Operational and Rock Conditions

Zou

Zheng

2018

Shock and Vibration

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Findings from disc cutting tests on alpine lithologies / Erkenntnisse aus Diskenschneidversuchen an alpinen Lithologien

Entacher

Lassnig

2012

Geomechanics and Tunnelling

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Full scale linear cutting tests with variable cutter spacing and penetration were conducted on different Alpine lithologies. The analysis focusses on different aspects: First, the investigation of excavated material regarding grain‐size distribution curves and aspect ratios. Second, the investigation of cutting forces to better understand rock breakage and the directional dependence of cutting forces in an anisotropic rock mass. A critical view of TBM performance prediction models is also presented. Results show that the percentage of coarse grain is positively correlated with increased cutter spacing, and changing penetration did not result in significant changes of grain‐size distribution. Analysis of cutting forces shows that knowledge of cutting forces enables a deeper understanding of rock breakage. Furthermore, it is shown that common performance prediction models are not able to cover certain types of rock satisfactorily.Im Rahmen dieser Arbeit werden Linearschneidversuche mit variablem Schneidspurabstand und Penetration an repräsentativen alpinen Lithologien präsentiert. Das Schwergewicht der Auswertung liegt in der Analyse des Ausbruchmaterials hinsichtlich Sieblinien und Kornform sowie in der Betrachtung der gemessenen Schneidkräfte zum besseren Verständnis des Gesteinsbruchvorgangs, der richtungsabhängigen Kräfte bei anisotropen Gesteinen sowie der kritischen Betrachtung von TBM‐Leistungsprognosemodellen. Die Ergebnisse zeigen, dass der Grobkornanteil bei steigendem Schneidspurabstand zunimmt. Die Änderung der Penetration zeigt keinen gravierenden Einfluss auf die Kornsummenkurve. Die Analyse der Schneidkräfte zeigt, dass die Kenntnis von Schneidkräften wertvolle Einblicke in den Gesteinsbruchmechanismus bietet. Als weiteres Ergebnis wird deutlich, dass gängige TBM‐Leistungsprognosemodelle die Schneidbarkeit bestimmter Gesteinsarten nicht adäquat vorhersagen können.

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Cutter force measurement on tunnel boring machines – System design

Entacher

Winter

Bumberger

et al. 2012

Tunnelling and Underground Space Technology

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Analysis of Force Path Diagrams of Linear Cutting Machine–Tests Regarding Geotechnical Parameters

Cited by 4 publications

References 7 publications

Performance Evaluation of Hard Rock TBMs considering Operational and Rock Conditions

Performance Evaluation of Hard Rock TBMs considering Operational and Rock Conditions

Findings from disc cutting tests on alpine lithologies / Erkenntnisse aus Diskenschneidversuchen an alpinen Lithologien

Cutter force measurement on tunnel boring machines – System design

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