Rock Failure and Crack Propagation Beneath Disc Cutters

Entacher, Martin; Schuller, Erik; Galler, Robert

doi:10.1007/s00603-014-0661-2

Cited by 58 publications

(22 citation statements)

References 39 publications

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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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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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“…As is shown in Figure 1(a) of the plane indentation contact surface, width of the rectangular rigid indenter is 2l, load on the rigid indenter is P, acting on the smooth half-plane, Poisson's ratio is ], and elastic modulus is E. Indentation interfacial stress distribution according to classical analysis is as follows [32,33]:…”

Section: Plane Indentation Configuration and Singular Stress Fieldmentioning

confidence: 99%

Calculation of Stress Intensity Factors at Both Ends of the Indenter under Eccentric Loads

Duo

2020

Mathematical Problems in Engineering

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During rock breaking by drill, cone rolls on the rock surface and contact between gear teeth and surface is basically positive Mode-I plane indentation and bias Mode-I plane indentation. During bias action, there will be an asymmetrical Mode-I singular stress field at both ends of the indenter. The stress field singularity is of the same order as Mode-I crack tip and with the same function distribution. In this paper, based on the J2 integral conservation law, a new method is established for solving stress intensity factor of bias Mode-I plane indentation, which not only provides respective stress intensity factor of both ends of the indenter but also compares relations between eccentricity, partial load, and stress intensity factor. The study not only provides a method for establishment of new cone drill engineering design but also improves rock layer boring efficiency.

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“…The next step is to investigate whether the very fine material can be modelled realistically using SPH (Smoothed Particle Hydrodynamics) elements. [19] längen. Danach werden sie mit einer Gesteinssäge halbiert und die Schnittflächen plan geschliffen.…”

Section: Numerical Modellingunclassified

“…In order to check whether the cracks were filled with resin, a coloured penetrant is regularly applied to the face side. The crack patterns are also investigated macroscopically as well as with a petrological microscope [19]. For a detailed observation of the cutting process, the distribution of intergranular and transgranular cracks is significant in addition to the mineralogy.…”

Section: Modellschneidversuchmentioning

confidence: 99%

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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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Rock Failure and Crack Propagation Beneath Disc Cutters

Cited by 58 publications

References 39 publications

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

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

Calculation of Stress Intensity Factors at Both Ends of the Indenter under Eccentric Loads

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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