Artikeldatenbank
Autor(en) | Titel | Zeitschrift | Ausgabe | Seite | Rubrik |
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Kohlböck, Bernhard; Griesser, Ewald; Hillisch, Stefan; Birgmann, Harald; Fasching, Alfred | The BIM pilot project Köstendorf - Salzburg / Das BIM-Pilotprojekt Köstendorf - Salzburg | Geomechanics and Tunnelling | 4/2018 | 325-334 | Topics |
KurzfassungThe new approx. 21 km long section between Köstendorf and Salzburg is one of the last major milestones in the upgrading of the Salzburg-Vienna rail corridor to four tracks. The section comprises a multitude of different civil engineering structures, posing high demands on the interdisciplinary design team. The open sections of the alignment require many over- and underpasses and road diversions. In addition, the majority of the section runs underground through the Flachgau Tunnel, which has the particular feature of a tunnel bridge. The aim of the BIM project is to provide a software-independent, integrated model of the whole project. All parties involved in the project collaborate to define the LOD for the terrain, existing building, land use and geological models, as well as the models for the proposed new infrastructure for the open section, tunnels, ventilation control building, bridges, civil structures and drainage. The LoD are defined in parallel with the AIA according to the KISTE infrastructure identification system used by ÖBB (Austrian Federal Railways). At the same time, the BIM execution plans are generated by the team and adapted to the new BIM processes. The opportunities provided by the element-based display and evaluation are anticipated to lead to considerable improvements in the field of interdisciplinary design and visualisation studies. The present article describes the current state of work and provides a preview of future developments. x | |||||
ibert, Marko; Lah, Martin; Saje, Samo | Challenges and opportunities in implementing BIM methodology in tunnelling | Geomechanics and Tunnelling | 4/2018 | 335-339 | Topics |
KurzfassungTunnelling differs fundamentally from mining, high rise buildings and civil surface construction in many ways, but when it comes to challenges, it combines the toughest from the three worlds. Tunnelling projects inherit uncertainties of ground conditions and constant preparedness for on-site changes from mining; complexity, dynamics and the need for detailing from buildings; and one of the challenges that tunnels inherit from civil surface construction is definitely the complex and curved geometry. To overcome the challenges and exploit the benefits of BIM methodology on tunnelling project it is essential to harmonize particles of existing standards, guidelines, processes and tools from the three worlds. x | |||||
Stelzer, Magdalena; Radoncic, Nedim; Iserte Llacer, Pedro Luis; Tatar, Ali; Holmberg, Mats | BIM processes and workflows using the example of the subway extension in Stockholm | Geomechanics and Tunnelling | 4/2018 | 340-347 | Topics |
KurzfassungThree major technical and economic factors of the “Yellow Line” project of the Stockholm subway network justify the decision to apply a BIM-oriented design: (1) Early optimization and risk minimization for cost and time and active counteraction to the loss of information throughout the entire lifecycle of the project, (2) all technical aspects are to be incorporated in the design simultaneously and from early stage onwards, (3) numerous surface and subsurface structures, including tunnels under operation and in vicinity of the new line lead to a complex geometrical layout and geotechnical influences on each of these structures are to be minimized. Commercial 3D/BIM products have proven to be developed for application in surface structure design and new methods had to be established to cope with high quality tunnel modelling, coordination and tunnelling challenges. This publication is addressing the experience and solutions made during the design: Choice of appropriate modelling tools, applied methodology for a structured design process in a multidisciplinary and manifold work environment, accounting to highly complex geologically-geotechnical data, seamless transfer of the model data to numerical analysis tools. The advantages and disadvantages of using BIM methodology are discussed and recommendations with regard to future development are presented. x | |||||
Exinger, Christoph; Mulitzer, Günther; Felsner, Rudolf; Lemmerer, Johann; Matt, Robert; Griesser, Ewald | BIM pilot project Granitztal tunnel chain - Development of data structures for tunnel structure and track superstructure / BIM-Pilotprojekt Tunnelkette Granitztal - Entwicklung von Datenstrukturen für den Tunnelrohbau und Oberbau | Geomechanics and Tunnelling | 4/2018 | 348-356 | Topics |
KurzfassungAn essential part of the Koralmbahn line, the Granitztal tunnel chain with a length of about 6.1 km runs between the Lavanttal and the Jauntal valleys and crosses the Deutsch Grutschen, the Granitztal and the Langer Berg. In early 2016, Austrian Railways ÖBB made a decision for the Granitztal tunnel chain project, which was then already under construction, to test the 3D model-based Building Information Modelling (BIM) design method in addition to conventional 2D design. One essential precondition for the application of the BIM method on transport infrastructure projects was recognised as the required data structures. In addition to the definition of general project requirements and standards for BIM, work started on the structuring and classification of the construction elements required for the tunnel structure and their properties. Of equal importance are the spatial positioning and location of the construction elements and the definition of topological relationships to each other. x | |||||
Frodl, Stephan; Mayer, Peter-Michael | BIM modelling in mined tunnelling / BIM-Modellierung im konventionellen Tunnelbau - Diskussion und Empfehlung für die zu berücksichtigende Bauwerksgeometrie in 3D-Modellen / Discussions and recommendation for the structural geometry to be considered in 3D models | Geomechanics and Tunnelling | 4/2018 | 357-365 | Topics |
KurzfassungIn the context of mined tunnelling, the excavation of the tunnel cross-section is performed with an overcut. The size of the required overcut depends on the expected rock deformation as well as on typical construction tolerances. Likewise, secondary linings are also built with an overcut in order to account for formwork deformation, construction tolerances and deformation due to ground loads. On the other hand, clients usually specify the nominal tunnel geometry, which differs from the overcut geometries previously mentioned. When designing a tunnel according to the BIM method, it should be clarified which geometry should be used to create the geometrical model, since deviations between the target and the overcut geometry can be considerable. To generate a drawing derived directly from the 3D BIM model for tunnel construction use, it is imperative that the geometrical model is created based on the overcut geometry. Only then can the reinforcement quantity or formwork be designed correctly. Only a model based on overcut geometries will yield the correct theoretical masses, which for example could be used for target-actual comparisons. This article outlines the basics of the current 2D design approach; its technical limits are presented and contrasted with the proposed 3D design model. The article further shows how a 3D BIM design model has to be created so that 2D drawings for construction can be derived or created from it. In addition, general recommendations are provided for creation of BIM geometrical models. x | |||||
Gruber, Christian; Weiner, Thorsten; Zuchtriegel, Ralf | BIM for tunnelling for a company- Approaches and strategies / BIM im Tunnelbau aus Sicht eines ausführenden Unternehmens - Herangehensweise und Herausforderungen | Geomechanics and Tunnelling | 4/2018 | 366-373 | Topics |
KurzfassungThe use of Building Information Modelling (BIM) for tunnelling projects, is not yet very common in Austria or Germany. First attempts to use BIM in tunnelling are being undertaken on specially selected and supported projects, but this can only be considered a first small step. In the following article, the current status and progress of BIM in tunnelling in Austria and Germany will be described and compared. Furthermore, the article focuses on a range of different aspects of BIM in tunnelling. Particular attention is paid to the special requirements of underground mining. This regards the challenges of the state of the art software capacities concerning the complex geometrical structures of underground constructions. Another important aspect is the interaction between ground and excavation method. The physical properties of the ground will never be completely known. Therefore, consolidated basics/rules for the behaviour and treatment of the ground have to be developed. BIM follows the principle of “first build virtually, then in reality”, for which reason construction companies have to be involved in the early planning phase. It is necessary to develop new contract models and to strive for a cooperative partnership. x | |||||
de Oliveira, Daniela Garroux G.; Thewes, Markus; Diederichs, Mark S.; Langmaack, Lars | EPB tunnelling through clay-sand mixed soils: Proposed methodology for clogging evaluation | Geomechanics and Tunnelling | 4/2018 | 375-387 | Topics |
KurzfassungThe clogging of Tunnel Boring Machine (TBM) tools by soils has long been investigated, owing to the numerous difficulties arising in shield tunnelling as a result. Its occurrence leads to operation delays owing to the frequent and lengthy interventions required to unblock the soil stuck to the excavation tools and screw conveyor. Several authors have proposed laboratory tests for evaluating the clogging potential, however, those include limitations, such as not considering the clay fraction in a soil. One of these methods is the empirical stickiness evaluation, whereby a mixer and a beater are used to define a clogging evaluation parameter. Following an extended test campaign using soils with different clay contents and minerals, it became clear that this method was not adequate to provide reliable information regarding the tendency of a soil to clog in a tunnel drive. A new device was then implemented, which adds to the first method a kinetic energy impulse via dropping of the beater from a certain height. This combination of methods could provide a reasonable approximation of the potential for clogging to occur along Earth Pressure Balance Machine (EPB) tunnel drives. This paper presents the results of the proposed combined methodology for clogging evaluation, as well as the research evolution that led to the addition of the beater dropping stage. x | |||||
Schubert, Wulf | 25 years of research and development at the Institute of Rock Mechanics and Tunnelling at Graz University of Technology / 25 Jahre Forschung und Entwicklung am Institut für Felsmechanik und Tunnelbau an der Technischen Universität Graz | Geomechanics and Tunnelling | 3/2018 | 203-212 | Topics |
KurzfassungThe Institute of Rock Mechanics and Tunnelling at the Graz University of Technology was founded in 1992. From the beginning, the primary focus of research and development was on Alpine tunnelling and slope stability issues, considering geological conditions and their impact on construction. The aim was to improve the current practice, as well as to reduce uncertainties. The research areas can be roughly grouped into rock mass characterization, improvement of monitoring data interpretation, ground behaviour assessment, as well as development and improvement of support elements. The research is documented in about 110 master theses and 30 doctoral theses, and approximately 350 papers. x | |||||
Entfellner, Manuel; Kluckner, Alexander; Lenz, Gerold; Poisel, Alexander; Schubert, Wulf | Short-term prediction of shotcrete utilization based on observations during tunnelling / Kurzzeitprognose der Spritzbetonauslastung auf Basis von Beobachtungen während des Tunnelvortriebs | Geomechanics and Tunnelling | 3/2018 | 214-225 | Topics |
KurzfassungDisplacement curves in tunnelling depend both on time and the distance from the face and have thus not died down immediately after excavation. Therefore - the applied shotcrete lining experiences temporally variable loading, which depends on the forced strain curve and on the material behaviour of the shotcrete. Overloading of the shotcrete lining leads to crack formation, costly and laborious repair work and possibly also to dangerous situations for those present at the location, and should therefore be prevented. With the method presented in this article, which combines geological-geotechnical parameters and the interpretation of measured displacement data, the accuracy of the short-term prediction of the system behaviour can be improved. This makes it possible to react early to any potential overloading of the planned support and adapt it if necessary (e.g. changeover to ductile support). The article concludes with an explanation of the method through the example of the Semmering Base Tunnel, contract SBT 1.1 - Tunnel Gloggnitz. x | |||||
Pichler, Bernhard; Hellmich, Christian | Hybrid methods for shotcrete and segmental linings tunnel shells - Combining displacement and rotation measurements with computational multiscale mechanics / Hybride Methoden für Spritzbeton- und Tübbingschalen - Kombination von Verschiebungs- und Verdrehungsmessungen mit Mehrskalen-Mechanik | Geomechanics and Tunnelling | 3/2018 | 226-235 | Topics |
KurzfassungThis contribution highlights recent developments in the analysis and monitoring of tunnel linings based on so-called hybrid methods. In this context, the word “hybrid” refers to a suitable combination of measurement data from geotechnical monitoring, with advanced simulation tools of engineering mechanics. The first part of this contribution refers to the New Austrian Tunneling Method (NATM), where monitoring during construction includes daily measurements of the 3D displacement vectors of “measurement points” installed in “measurement cross-sections”. Shell theory-informed spatial and temporal interpolation of the displacements between the aforementioned “grid points”, allows for reconstructing the evolution of the displacement and strain fields throughout the tunnel shell. Feeding these fields into realistic thermo-chemo-mechanical, potentially multiscale, models for the chemically hardening and creeping shotcrete, allows for the determination of the lining stresses over time. The latter give access to corresponding safety indicators or utilization degrees considering the evolving strength of shotcrete; and they also allow for quantifying the traction forces acting from the rock mass, on the exterior boundary of the tunnel lining. The second part of this contribution refers to the first steps towards the hybrid analysis of segmental lining, as installed in mechanized tunnelling. Relative rotation angles, as measured, in the course of a full-scale test, in the joints between adjacent segments of a segmental ring, are prescribed on a structural mechanics model based on analytical solutions from circular arch theory. x | |||||
Henzinger, Michael R.; Willmes, Michael; Lagger, Manuel; Kathage, Andreas F.; Moritz, Bernd A.; Schubert, Wulf | Detection of voids in the annular gap using ground penetrating radar and determination of the in-situ deformation properties of pea gravel / Detektion von Hohlräumen im Ringspalt mittels Georadar und Ermittlung der in situ Verformungseigenschaften von Perlkies | Geomechanics and Tunnelling | 3/2018 | 236-250 | Topics |
KurzfassungWhen using shield machines, the excavation support is established using prefabricated concrete segments. The structurally required cavity between the built ring and the rock mass is usually filled with pea gravel in hard rock conditions. The backfilled material ensures the necessary bedding and evenly distributes the rock loads. To evaluate the in-situ deformation behaviour of pea gravel, a testing device was developed that measures the reaction of the backfill under load increase and load decrease on the basis of the static load plate test. The test is carried out via the opening for pea gravel injection. The results have shown that the elasticity of pea gravel is predominantly influenced by the load level and the type of loading. x | |||||
Henzinger, Michael R.; Schachinger, Tobias; Lienhart, Werner; Buchmayer, Fabian; Weilinger, Walter; Stefaner, Raimund; Haberler-Weber, Michaela; Haller, Eva-Maria; Steiner, Michael; Schubert, Wulf | Fibre-optic supported measurement methods for monitoring rock pressure / Faseroptisch unterstützte Messmethoden zur Beobachtung von Gebirgsdruck | Geomechanics and Tunnelling | 3/2018 | 251-263 | Topics |
KurzfassungLike every civil engineered structure tunnels are subject to an ageing process. The reasons for the degrading of the condition are manifold: not fully completed stress redistribution, deterioration in the rock mass quality through long-term exposure (creeping), weathering or dynamic loads and stresses, to name but a few. All this processes lead to a deformation of the surrounding bedrock and the lining. x | |||||
Galler, Robert; Wenighofer, Robert; Gehwolf, Paul; Stoxreiter, Thomas; Schuller, Erik; Pittino, Gerhard; Darmaev, Enkhe | Overview of current research work at the Chair of Subsurface Engineering at Montanuniversitaet Leoben / Überblick zu laufenden Forschungsvorhaben am Lehrstuhl für Subsurface Engineering an der Montanuniversität Leoben | Geomechanics and Tunnelling | 3/2018 | 265-275 | Topics |
KurzfassungThe Chair of Subsurface Engineering at the Montanuniversitaet Leoben is part of the Department of Mineral Resources Engineering. Regarding research and development, the chair cooperates with several departments of the university, such as the Departments of Petroleum Engineering, Environmental and Energy Technology, Product Engineering and Polymer Engineering. In addition to the construction of the ZAB, a research and development but also training and education centre at the Styrian Erzberg, some other research projects at the chair have recently been reported in this journal. These include, for example, research on segmental lining design in collaboration with with the ÖBB-Infrastruktur AG, and also topics such as disc force and face monitoring systems for TBMs. This research is deliberately not discussed here; rather research is reported that has received less attention lately. This includes further developments mainly relating to laboratory tests, the research field of rockfall simulations, international research cooperations, and also work on BIM implementation at the ZAB-Zentrum am Berg. x | |||||
Schachinger, Tobias; Zagar, Bernhard; Schwab, Christian; Saliger, Florian; Stur, Michael | Current research by ÖBB Infrastruktur AG on scale monitoring without track closures / Aktuelle Forschungen der ÖBB Infrastruktur-AG zu Versinterungsmonitoring ohne Einschränkung des Eisenbahnbetriebs | Geomechanics and Tunnelling | 3/2018 | 277-285 | Topics |
KurzfassungIn water pressure-relieved rail tunnels, calcium carbonate scaling occurs in tunnel drain pipes. This scaling is caused by the surrounding geology, groundwater or the use of building materials containing cement. If the amount of scale becomes excessive, the drains have to be be cleaned to prevent an increase of the water pressure on the tunnel lining, which can cause damage to the tunnel structure or water ingress. At the moment, the growth of scale in tunnel drainage can only be monitored by camera surveys. This requires closure of the track or the whole tunnel and causes a massive operational restriction. Therefore the ÖBB-Infrastruktur AG project “Task Force Drainage” is looking for ways to monitor the growth of scale without any operating restrictions. Among other measures, an FFG project has been launched, and international knowledge transfer is taking place in the context of Shift2Rail. Various sensors and measuring methods are currently being examined regarding their suitability for this research question, examples including the measurement of differences in electrical resistance and acoustic measurement methods. x | |||||
Schwalt, Markus; Rabaiotti, Carlo | Storage sites for tunnel excavation material - challenges and approach using the Gotthard and Ceneri Base Tunnels as examples / Ablagerungen von Tunnelausbruchmaterial - Herausforderungen und Vorgehen am Beispiel Gotthard- und Ceneri-Basistunnel | Geomechanics and Tunnelling | 3/2018 | 287-300 | Topics |
KurzfassungThe construction of the Gotthard and Ceneri Base Tunnels through the Alps resulted in large quantities of excavated material. Selecting appropriate storage sites for the excavated material is a very important step that is often determined not only by technical criteria but also by external circumstances, a fact that may lead to sites that are not optimally suitable. Managing geotechnically difficult conditions in a professional manner is a decisive prerequisite to make a success of the planning and design process. Applying profound experience furthermore permits optimizations which lead to more efficient utilization of the available storage areas while at the same time maintaining the required structural stability. Such optimizations require detailed geotechnical investigation, careful planning and design, and thorough observation during construction. Furthermore, experience and specialist knowledge of comparable structures are helpful. The Chalchofen storage site at the Gotthard and the Sigirino site at the Ceneri Base Tunnel are used as examples to present a target-oriented approach. The observations and measurements made the projects a success. To ensure a favorable outcome of such construction projects, it is of vital importance that all the parties involved (owner, consultant and checking engineer) work together effectively and efficiently. x | |||||
Feinendegen, Martin; Ziegler, Martin | The significance of the LCPC test as a tool for the specification of homogeneous areas / Zur Aussagekraft des LCPC-Versuchs für die Festlegung von Homogenbereichen | Geomechanics and Tunnelling | 2/2018 | 113-122 | Topics |
KurzfassungWith the revision of the German contract conditions VOB in 2015, the previously usual soil and rock classes were replaced by homogeneous areas, into which the ground is to be divided according to the condition of soil and/or rock before excavation. Numerous properties and characteristic values also have to be specified with their determined bandwidths. In the tendering process for many works in specialised civil engineering, earthworks and tunnelling, the abrasiveness now always has to be assessed and, if necessary, tested for soil using the LCPC test according to the French standard NF P18-579. This test was originally designed to determine the abrasion and crushability of artificial aggregates and is normally carried out under conditions that are in most cases unrepresentative of the behaviour of natural (mixed grained) soils in-situ. Transfer of the results to the contractually binding ground report required by the VOB is therefore extremely critical, as this article points out based on new investigations with the LCPC test. x | |||||
Macias, Francisco Javier; Nærland, Jarand; Espallargas, Nuria | Cutter wear mechanisms in hard rock tunnel boring | Geomechanics and Tunnelling | 2/2018 | 123-130 | Topics |
KurzfassungCutter consumption and parameters such as cutter ring wear has a great relevance in the overall excavation time and cost in hard rock tunnel boring machines (TBMs), especially in hard rock conditions. Cutter wear involves a complex tribological system that interacts also with the geologicy of the rock mass. Understanding the processes and failure mechanisms during cutter wear (e.g. modes of contact, wear, load effects) and assessing the influence of temperature on cutter ring wear processes enables new knowledge to be applied to get better cutter consumption predictions and future improvements in cutter ring development. In addition, it might be used to evaluate the suitability of the new rock abrasivity test method (Rolling Indentation Abrasion Test, RIAT) for assessing cutter ring wear. x | |||||
Küpferle, Jakob; Röttger, Arne; Theisen, Werner; Alber, Michael | Tribological analysis of the TBM tool wear in soil from the view of material science / Tribologische Analyse des Abbauwerkzeugverschleißes von Tunnelvortriebsmaschinen in Lockergestein aus werkstofftechnischer Sicht | Geomechanics and Tunnelling | 2/2018 | 131-141 | Topics |
KurzfassungExcessive 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. x | |||||
Ellecosta, Peter; Käsling, Heiko; Thuro, Kurosch | Tool wear in TBM hard rock drilling - backgrounds and special phenomena | Geomechanics and Tunnelling | 2/2018 | 142-148 | Topics |
KurzfassungIn hard rock TBM drilling, wear issues play a crucial role in the success of a tunnelling project. Thus, excavation tools must be selected carefully and be adapted to ground conditions. Wear-related changes in the tools that occur over the course of the tools' operating lives must also be taken into account. This paper presents five basic types of macroscopic wear for cutter rings: (1) abrasive/normal wear, (2) tapering, (3) mushrooming, (4) brittle fracture of the cutter ring (special wear type 1) and (5) blockade of the roller bearing (special wear type 2). These basic wear types lead to distinct cutter ring shapes which allow deriving some fundamental characteristics of the interacting rock types. In addition, a microscopic analysis of the surfaces and associated metallographic sections from worn cutter tools has been performed. As a result, the tribological processes under the cutter, leading to tool wear, can be better understood. In summary, the investigations may contribute to a better understanding to make it easier to choose the proper TBM disc cutter for a distinct rock type in order to minimize the risk of tool-related downtimes. x | |||||
Gwildis, Ulf Georg; Sass, Ingo | Tool wear analysis of pressurized face TBM drives in the glacial geology of the Pacific Northwest | Geomechanics and Tunnelling | 2/2018 | 150-155 | Topics |
KurzfassungFor underground construction projects in the United States and Canada it is standard procedure to use a Geotechnical Baseline Report (GBR) to contractually define subsoil conditions. The GBR sets baselines based on which tunneling contractors develop bids and plan the works. Baseline values for soil abrasiveness are a focus especially where drives with pressurized-face Tunnel Boring Machines (TBM) beneath the groundwater table and in unstable face conditions require changing the cutterhead tools under hyperbaric conditions or in pre-constructed safe havens. x | |||||
Plinninger, Ralf J.; Alber, Michael; Düllmann, Jan | Rock mass-scale factors with an influence on tool wear in the mechanised tunnelling process in hard rock / Gebirgsmaßstäbliche Einflussfaktoren auf den Werkzeugverschleiß bei maschinellen Tunnelvortriebsverfahren im Hartgestein | Geomechanics and Tunnelling | 2/2018 | 157-167 | Topics |
KurzfassungWear to the tools used for excavate the rock mass has a significant relevance for the cost and performance of tunnel drives in hard rock. This applies in particular to mechanised tunnelling processes, where the effect of wear is an important factor for system availability. At the moment, laboratory tests and derived abrasiveness indices like the Cerchar Abrasiveness Index (CAI) or the Rock Abrasivity Index (RAI) provide the basis for evaluation of tool wear. It should however be noted that such index values can only take into account influential factors on the scale of the intact rock. Influential factors on the scale of the rock mass, for example mixed-face conditions, unstable face conditions, blockiness or the primary and secondary stress states at the face, can also be significant for the tool wear that is actually experienced. The possible consequences of such disadvantageous effects, which for example can cause catastrophic failure of tools, can represent many times the abrasiveness of the intact rock. x | |||||
Rauch, Roman; Goliasch, Robert; Käsling, Heiko; Thuro, Kurosch | Does the in-situ stress state have an effect on tool wear in deep TBM tunnelling? / Haben Gebirgsspannungen Einfluss auf den Abrasivverschleiß im tiefliegenden TBM-Vortrieb? | Geomechanics and Tunnelling | 2/2018 | 169-177 | Topics |
KurzfassungAnalysis of wear data from a TBM tunnelling project under high overburden shows diverging wear rates on the disc cutters depending on their position in the cutterhead. The disc cutters at inner and middle positions in the cutterhead reach about twice the running distances compared with cutters fitted at pre-gauge positions. This work shows that the construction of the cutterhead has an impact on the degree of abrasive wear, especially for the gauge positions. Moreover, the analysis shows that the in-situ stress state correlates significantly with disc cutter wear. x | |||||
Anagnostou, Georg; Schuerch, Roberto; Perazzelli, Paolo | Lake Mead Intake No 3 Tunnel - Design considerations and construction experience | Geomechanics and Tunnelling | 1/2018 | 15-23 | Topics |
KurzfassungThis paper presents the pre-construction evaluation of the ground for the Lake Mead Intake No 3 Tunnel and the experience gained from the project, which had the aim of maintaining water supplies for the Las Vegas greater metropolitan area. The construction of this tunnel using a dual-mode slurry shield represents a major engineering achievement, which pushed back the boundaries of closed shield tunnelling: Overcoming an extended fault zone under high hydrostatic pressure in the metamorphic rocks and mucking-out difficulties associated with high rates of water inflow in the sedimentary rocks necessitated closed-mode operation over about 2 km at unprecedentedly high face pressures of up to 14 bar. x | |||||
Och, David J.; Bateman, Geoff; Maidl, Ulrich; Comulada, Marc | Sydney Metro - ground characterisation and TBM selection for the Sydney Harbour crossing | Geomechanics and Tunnelling | 1/2018 | 24-33 | Topics |
KurzfassungThe Sydney Harbour crossing is a key element of Sydney Metro City & Southwest, which includes 15.5 km of twin tube running tunnels extending from Chatswood at the north through to Sydenham, south of the Central Buisness District (CBD). One of the key features is the 1 % length of the alignment that passes under Sydney Harbour. The rest of the alignment is through rock, but the harbour crossing is designed to pass through harbour sediments and mixed face conditions undersea. An in depth study and analysis was required to confirm the feasibility of the safe construction of this short length of the tunnel in sub-aqueous, soft ground conditions. It was necessary to carry out detailed, targeted investigation of the ground to enable the selection of an appropriate tunnelling technique for constructing the tunnels. x | |||||
Stascheit, Janosch; Nini , Jelena; Meschke, Günther; Hegemann, Felix; Maidl, Ulrich | Building Information Modelling in mechanised shield tunnelling - A practitioner's outlook to the near future / Building Information Modelling im maschinellen Schildvortrieb - Ein praxisorienterter Blick in die nähere Zukunft | Geomechanics and Tunnelling | 1/2018 | 34-49 | Topics |
KurzfassungThe contribution takes a glance at the application of BIM technologies in the design and construction phases of shield tunnelling projects. The intention is to show how Building Information Modelling can be translated into actual benefit, not only in the operation phase but also in the design and construction phases of bored tunnels. Emphasising the integrative character of referencing data uniformly in space and time, examples are given of seamless communication between 3D geometrical modelling, efficient numerical simulation and model adaptation based on measured data acquired during the boring process. The article covers the complete range from predesign through structural analysis and detailed design until the actual excavation process including its interactions with the environment. Special emphasis is given to data management, which is the key to transforming a mere 3D visualisation into a Building Information Model. The article therefore presents a concept for database-supported, web-based integration of software modules for geometrical modelling in various levels of detail, efficient numerical simulation tools that are based upon this representation, and process controlling that manages all data acquired during the construction process in a spatially and temporally coordinated reference system. x |