Cutter force measurement on tunnel boring machines – System design

Entacher, Martin; Winter, George; Bumberger, Thomas; Decker, Klaus; Gódor, István; Galler, Robert

doi:10.1016/j.tust.2012.04.011

Cited by 69 publications

(21 citation statements)

References 13 publications

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“…The performance prediction depends on the disc cutter and the rock mass properties; therefore, full-scale rock cutting tests combined with physical property tests are probably the most reliable production estimation techniques, in which the cutter forces are directly measured by the LCM test for full-size cutters and large rock samples. Currently, the most reliable prediction method in competent rock formation is a combination of theoretical and empirical methods, wherein the measured cutter forces are adjusted for ground conditions and machine limitations (Gertsch and Gertsch, 2001;Gertsch et al, 2007).…”

Section: Rock-breaking Mechanism Of the Disc Cuttermentioning

confidence: 99%

“…In excavation with TBM, predicting the performance of the method for various types of rock masses has become an important factor in project planning and determining excavation efficiency. Many predictive models have been developed using laboratory tests and field observations to determine the important factors for designing a suitable disc cutter (Graham, 1976;Nelson et al, 1985;Hughes, 1986;Gertsch et al, 2007;Balci and Bilgin, 2007;Entacher et al, 2012). Among these models, representative testing procedures include the Linear Cutting Machine (LCM) test used in Colorado School of Mines (CSM) and the Drilling Rate Index (DRI) test developed by the Norwegian University of Science and Technology (NTNU) (NTNU-Anleggsdrift, 1998;Olgay and Kahraman, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Numerical study to estimate the cutting power on a disc cutter in jointed rock mass

Choi

Lee

2015

KSCE J Civ Eng

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The Linear Cutting Machine (LCM) test is known to be a reliable method for designing disc cutters by estimating the penetration performance of a Tunnel Boring Machine (TBM). The LCM test is a laboratory test that uses large-scale rock blocks to estimate the real-scale load on disc cutter; the LCM test offers many advantages, but the costs of preparing the rock samples and performing the laboratory test are too high. In addition, the test results from jointed rock blocks are rarely trustworthy because of the difficulty of performing the LCM test with this type of rock sample. To compensate for the failings of the laboratory test, many studies have been conducted to develop a suitable numerical model. However, few studies have investigated the mechanism of rock fragmentation as a function of the joint spacing and the joint direction. This paper presents the results of a Discrete Element Analysis (DEA) of the cutting power exerted on a TBM disc cutter at various joint dip angles, dip directions and spacings. The results show that the cutting power must be increased when the disc cutter advances in a direction opposite to the joint dip. The numerical analysis also shows that the cutting power of a disc cutter increases as the joint dip angle decreases and the joint spacing decreases. Comparing the relationship between the cutting power of the disc cutter and the distribution pattern of the rock joints with the LCM test results can be used to increase the reliability of TBM performance predictions.

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Section: Rock-breaking Mechanism Of the Disc Cuttermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical study to estimate the cutting power on a disc cutter in jointed rock mass

Choi

Lee

2015

KSCE J Civ Eng

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“…Entacher [7], [9], [11], [12], [13], [14], [15], [16] has shown that the geological conditions in front of a cutterhead can be described from the disc cutter force characteristics. These developments should lead to better understanding of the relationship be-…”

Section: Dclm -Disc Cutter Load Monitoringmentioning

confidence: 99%

Development of resource‐efficient tunnelling technologies – Results of the European research project DRAGON

Galler

2015

Geomechanics and Tunnelling

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A wide range of different minerals is found in materials excavated in tunnels. The DRAGON project therefore has the aim of investigating the requirements of the industries producing products from mineral raw materials and who thus could be interested in raw materials derived from underground construction sites. In parallel to the development of advanced online technologies for the analysis of excavated materials, DRAGON is researching the significant requirements for raw materials used in industrial processes; these include grain size distribution, mineralogical composition, geochemistry as well as water content and water absorption properties.Tunnel construction – not only with TBMs – is already a highly industrialized and technologically demanding process, with high advance rates. One important condition for both machine manufacturers and construction companies has been that advance rate should not be adversely affected by the new developments from DRAGON. Another objective of the DRAGON project was to consider the wider strategic objectives of EU policy and to highlight any areas where barriers may exist to the benefits of applying the DRAGON technology.In Tunnelausbruchmaterial können unterschiedlichste mineralische Rohstoffe enthalten sein. Das Forschungsprojekt DRAGON hat sich daher zum Ziel gesetzt, die Anforderungen jener Industriezweige zu studieren, die ihre Produkte auf Basis von mineralischen Rohstoffen herstellen und daher an Tunnelausbruchmaterial interessiert sein könnten. Parallel zur Entwicklung von Online Analyseverfahren für Tunnelausbruchmaterialien wurden die wesentlichen Anforderungen der mineralischen Rohstoffe für die verschiedenen Industriezweige erhoben; dazu gehören Korngrößenverteilungen, mineralogische Zusammensetzung, geochemische Parameter aber auch der Wassergehalt und das Wasserabsorptionsvermögen.Tunnelvortriebe – nicht nur solche mit Tunnelvortriebsmaschinen – sind heute hochindustrialisiert und erreichen daher hohe Vortriebsraten. Eine wesentliche Bedingung sowohl der Maschinenhersteller als auch der Bauindustrie war daher, dass die Vortriebsgeschwindigkeiten durch die neuen Entwicklungen im Projekt DRAGON nicht negativ beeinflusst werden dürfen. Weitere Aufgabenstellung des Projektes war, dass die diesbezüglichen strategischen Ziele der europäischen Politik verfolgt und eventuell vorhandene Unwegbarkeiten, die eine Umsetzung der neuen Technologien im Tunnelbau behindern, aufgezeigt werden.

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“…Die Herrenknecht AG entwickelte ein System basierend auf piezo-resistiven Sensorplatten [11]. Beim System MUL Entacher [8] [9], das DMS-applizierte Messschrauben verwendet, ist die Kraftmesstechnik im unmittelbaren Nahbereich der Diskenachse positioniert. Each cutting test is carried out with two cutting tracks (cutting track spacing 30 mm) and five cuts per cutting track.…”

Section: Test Evaluationunclassified

The transparent face – development work to solve problems in mechanized hard rock tunnelling / Die gläserne Ortsbrust – Entwicklungsarbeiten zur Lösung von Fragestellungen rund um maschinelle Vortriebe im Festgestein

Schuller

Galler

Barwart

et al. 2015

Geomechanics and Tunnelling

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While image‐based face documentation is well established in conventional tunnelling, even photogrammetric 3D reconstruction, this technical aid is not available in mechanized tunnelling. In a research project of the Chair of Subsurface Engineering with Geodata GmbH, work is underway to develop an imaging device, which is mounted in the cutterhead of a TBM and takes pictures during the maintenance shift that can be used for a photogrammetric reconstruction of the face. In the present article, the results of the first test images are presented. These were undertaken on a tunnel boring machine on the ÖBB project Koralm Tunnel KAT2 in agreement with the research initiative of the ÖBB‐Infrastruktur AG. Beside the optical imaging of the face, the determination of the load acting on disc cutters is another focus of research at the Chair. The Disc Cutter Load Monitoring (DCLM) system can be used to provide detailed information about the face and its properties affecting excavation with discs, and further forecasts about penetration and tool wear can also be made. The development of the disc cutter load monitoring system is part of the DRAGON project, which is supported by the European Commission under the FP7 Programme. Finally, the small scaled cutting test of the Chair of Subsurface Engineering is presented. This test rig is designed as an addition to conventional hydraulic testing presses and offers the capability of setting penetration and cutting track spacing. The samples used are half cylinders made from drill cores. The first comparison of the test results with those from large‐scale cutting tests have shown that the model cutting test delivers results that are well suitable for the forecasting of TBM performance. Während die bildbasierte Ortsbrustdokumentation bis zur photogrammetrischen 3D‐Rekonstruktion in konventionellen Vortrieben gut etabliert ist, fehlt es im maschinellen Tunnelbau an diesen Hilfsmitteln. In einem Forschungsprojekt des Lehrstuhls für Subsurface Engineering mit der Geodata GmbH wird an der Entwicklung einer Aufnahmeeinheit gearbeitet, die im Bohrkopf einer TBM montiert wird und in der Wartungsschicht Bilder von der Ortsbrust aufnimmt, die Grundlage einer photogrammetrischen 3D‐Rekonstruktion der Ortsbrust bilden. Im vorliegenden Beitrag werden Ergebnisse erster Testaufnahmen präsentiert, die auf einer Tunnelvortriebsmaschine des ÖBB‐Projekts Koralmtunnel KAT2 in Übereinstimmung mit der Forschungsinitiative der ÖBB‐Infrastruktur AG vorgenommen wurden. Neben der optischen Aufnahme der Ortsbrust ist die Schneidkraftermittlung von Diskenmeißeln ein weiterer Forschungsschwerpunkt des Lehrstuhls. Durch den Einsatz eines Disc Cutter Load Monitoring (DCLM) Systems können detaillierte Aussagen über die Ortsbrust und deren Abbaueigenschaften mit Disken als auch weiterführend Prognosen über die Penetration und den Werkzeugverschleiß getätigt werden. Die Entwicklung des Diskenkraftmesssystems erfolgt im Rahmen des DRAGON‐Projekts, das von der Europäischen Kommission im Rahmen des FP7 Programms...

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Cutter force measurement on tunnel boring machines – System design

Cited by 69 publications

References 13 publications

Numerical study to estimate the cutting power on a disc cutter in jointed rock mass

Numerical study to estimate the cutting power on a disc cutter in jointed rock mass

Development of resource‐efficient tunnelling technologies – Results of the European research project DRAGON

The transparent face – development work to solve problems in mechanized hard rock tunnelling / Die gläserne Ortsbrust – Entwicklungsarbeiten zur Lösung von Fragestellungen rund um maschinelle Vortriebe im Festgestein

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