Artikeldatenbank
Autor(en) | Titel | Zeitschrift | Ausgabe | Seite | Rubrik |
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Edelmann, Thomas; Himmelsbach, Christian; Barwart, Stefan | Direct use of excavated material in mechanised tunnelling - development of the prototype | Geomechanics and Tunnelling | 4/2015 | 310-314 | Topics |
KurzfassungThe DRAGON project (Development of Resource-efficient and Advanced Underground Technologies) is intended to improve resource efficiency in tunnelling processes by providing the excavated material as a raw material. The project deals with the systematic reuse of excavated material from tunnel boring machines (TBMs) and is mainly focussed on the development of specific automated analysis and separation technologies. This enables resource-efficient reuse of excavated material through the installation of innovative technology directly on the TBM. The physical characteristics of excavated material can be concluded by measuring the disc cutter load. The mineralogical and/or elementary parameters will be detected by a fully automated side pass analysis system. For this purpose, Herrenknecht AG and the Montanuniversität Leoben are working with other internationally renowned partners in the framework of the DRAGON project on various methods of characterising excavated material. x | |||||
Petitat, Manuel; von Allmen, Katja; Burdin, Jacques | Automation of rock selection and aggregate quality for reuse in tunnelling and industry | Geomechanics and Tunnelling | 4/2015 | 315-320 | Topics |
KurzfassungThe tunneling industry is flourishing around the world. But what about the spoil material? This paper presents the different steps achieved towards an automation of rock selection and aggregate quality assessment for tunnelling to reduce environmental impacts and maximize the use of excavation materials by analyzing and processing TBM muck on-line, inside the tunnel, on the tunnel boring machine. x | |||||
Erben, Hartmut; Galler, Robert; Grechenig, Thomas | MineralBay - the portal for raw materials and projects from subsurface construction / MineralBay - das Portal für mineralische Rohstoffe und Projekte aus dem Untertagebau | Geomechanics and Tunnelling | 4/2015 | 321-332 | Topics |
KurzfassungIn order to achieve higher utilisation rates for the material excavated from underground construction sites, one of the main objectives is efficient, digital processing of available data on material, mass and time parameters for the mined rock. Selected information needs to be made available to a wide audience at the same time. This initiates a value chain, which goes far beyond the construction industry and enables successful upcycling. The evolving software MineralBay is committed to this goal by using the internet to bring together owners or suppliers of mineral resources with customers easily, quickly and at any time to facilitate the exchange and trading of raw materials. MineralBay is a management and merchandising system for excavated material, whose speciality is access to and processing of real-time data, e.g. in the form of online material analysis results from tunnel boring machines. The information obtained is used for quality management of already placed excavation material and for gapless documentation of the material flow from the beginning to the end of the construction project. x | |||||
Shonfield, Peter; Anderson, Jane; Boyd, Sarah | A methodology for assessing the environmental benefits of DRAGON technology | Geomechanics and Tunnelling | 4/2015 | 333-339 | Topics |
KurzfassungMost excavated material generated from tunnelling projects ends up being deposited on land. The EU funded project “DRAGON” aims to develop technologies to analyse and characterise this material so that the potentially usable fraction can be easily separated from non-usable material. Increasing use of this material by external industries will improve resource efficiency while reducing landfill quantities and disposal costs. One of the project goals is to assess the potential environmental benefits/costs of applying DRAGON technology to planned future EU tunnelling projects. A three stage approach has been adopted to meet this goal. Firstly, the potential for diverting material from landfill must be assessed. To account for the diversity of tunnelling projects, this will be based on an average of 54 recent tunnelling projects. Secondly, a life cycle assessment (LCA) model will be created to allow each of these tunnelling projects to be analysed and the potential benefits of using DRAGON technology will be compared against the ‘business as usual’ case. These results will then be averaged to give the expected environmental costs/benefits per t excavated material. Finally, these costs/benefits will be scaled up to account for the expected amount of material from future European tunnelling projects - expected to be around 800 m. t. x | |||||
Posch, Helmut; Otto, Richard; Huber, Helmut; Murr, Roland; Kager, Matthias; Wagner, Hanns | Recycling of tunnel excavation using the example of the Koralm Tunnel, contract KAT2 - Status April 2015 / Verwertung von Tunnelausbruch am Beispiel des Koralmtunnels, Baulos KAT2 - Stand April 2015 | Geomechanics and Tunnelling | 4/2015 | 340-347 | Topics |
KurzfassungContract KAT2 will produce about 8.6 m. t of material excavated from the tunnel. In the course of the design work, maximum reuse of this material was intended, always considering economics and while reducing the environmental impact by minimizing transport and saving resources. More than half of the suitable tunnel spoil will be preliminarily screened and then processed for the production of aggregates for concrete production. After the first year of production, the high losses associated with the preliminary screening and processing demanded measures to improve the processing, which led to an improvement of the recycling quota. The aggregates produced on site so far fulfil the technical requirements for concrete production, even for high strength concrete grades. x | |||||
Maurer, Walter | Light management below ground: lighting technology in tunnelling / Lichtmanagement unter Tage: Beleuchtungstechnik im Tunnelbau | Geomechanics and Tunnelling | 4/2015 | 348-355 | Topics |
KurzfassungNew lighting technologies are everywhere and LED (light emitting diode) has become a popular search term for buyers of lighting equipment. The energy saving potential is enormous and energy efficiency has become important in any company, from agricultural and industrial businesses to service providers. To encourage this development, a new law was introduced by the Austrian Ministry of Science, Research and Business in 2014 that requires businesses to determine energy saving potential and reduce energy consumption. Replacement of outdated lighting technologies does have great potential for energy saving, but light is also an essential factor in the world of work, and companies have long underestimated its influence on the performance and motivation of staff. Lighting was and still is a precondition for working underground, but how much light is needed? The following article is intended to draw attention to the importance of light below ground and indicate possible effects on performance and health. x | |||||
Gratzer, Reinhard; Bechtel, Achim; Sachsenhofer, Reinhard F.; Gawlick, Hans-Jürgen | Geogenic versus Anthropogenic: Hydrocarbons in the Spoil from the Falkenstein and Spering Tunnels (A9 Pyhrn Autobahn, Austria) | Geomechanics and Tunnelling | 4/2015 | 356-363 | Topics |
KurzfassungIn the Falkenstein und Spering tunnels (A9 Pyhrn Autobahn; Northern Calcareous Alps), hydrocarbon contents (HC Index) in excess of the permitted threshold values were detected in the course of the routine statutory analysis of the excavated material. Comparative detailed geochemical analysis of retained reference samples, operational consumables and core samples from boreholes drilled into the tunnel wall show that threshold values of HC indices in the Reifling Limestone are exceeded due to the presence of locally generated natural hydrocarbons. The hydrocarbons were probably formed in marly zones of the carbonate rocks and migrated into the well-developed fracture network. These hydrocarbons are characterized by high contents of n-alkanes, high Ts/(Ts+Tm) ratios, a predominance of C27 and C29 steranes, and the lack of oleanane. Traces of hydrocarbons in the Wetterstein Limestone contain oleanane due to contamination by operating consumables. x | |||||
Site Reports: Geomechanics and Tunnelling 4/2015 | Geomechanics and Tunnelling | 4/2015 | 364-365 | Site Reports | |
KurzfassungInternational Rockfall Protection Conference 2015 in Zürich / Internationale Steinschlagschutz-Konferenz 2015 in Zürich x | |||||
Diary of Events: Geomechanics and Tunnelling 4/2015 | Geomechanics and Tunnelling | 4/2015 | 366 | Diary of Events | |
Inhalt: geotechnik 4/2015 | geotechnik | 4/2015 | Inhalt | ||
Kahl, Matthias | Geotechnik aus Leidenschaft? | geotechnik | 4/2015 | 253 | Editorial |
Sondermann, Wolfgang | Herausforderungen der zunehmenden Internationalisierung | geotechnik | 4/2015 | 254 | Vom Vorsitzenden |
Gudehus, Gerd; Keßler, Jürgen; Lucke, Beate | Setzungsfließen | geotechnik | 4/2015 | 255-266 | Fachthemen |
KurzfassungDer Begriff Setzungsfließen bezeichnet eine Rutschung von teilweise geflutetem lockerem Sand in geneigtem oder abgeböschtem Gelände mit Verflüssigung unterhalb einer erdfeuchten Deckschicht. Durch Initiale genannte mechanische Störungen wird der Porenwasserdruck erhöht und eine Kettenreaktion ausgelöst, bei der nacheinander Teile einer erdfeuchten Deckschicht auf einer zunehmenden Sandbreizone wegschwimmen, bis die bewegte Masse sich talseits - ggf. unter Wasser - staut und sich bergseits in Bruchstaffeln verklemmt. In offenem Wasser vor einem Böschungsfuß entstehen dabei infolge rascher Verdrängung Schwallwellen. Ein lockeres geflutetes Korngefüge neigt mit gashaltigen Makroporen vermehrt zur Verflüssigung. Das in einer von selbst voranlaufenden Front zu Sandbrei kollabierende Korngefüge erzeugt kilometerweit beobachtbare seismische Wellen. Hinter der Front steigen Gas und Wasser aus dem Sandbrei auf und reißen Körner mit. Durch schonende Sprengungen wird eine Ausgasung und Entwässerung erreicht, wobei ein Setzungsfließen durch die erdfeuchte Deckschicht mithilfe von Perforationen blockiert wird. Die Entwicklung von Sandbreizonen ist an der Fernfeldseismik erkennbar; das ermöglicht eine günstigere Anordnung von Sprengungen und Perforationen und unterstützt den Nachweis der Stabilisierung. So werden bereits rekultivierte Tagebaukippen in der Lausitz wieder nutzbar, die Innovationen sind aber nicht darauf begrenzt. x | |||||
Thieken, Klaus; Achmus, Martin; Lemke, Katrin | A new static p-y approach for piles with arbitrary dimensions in sand | geotechnik | 4/2015 | 267-288 | Fachthemen |
KurzfassungWhen it comes to the general design of laterally loaded piles in offshore environments, bedding resistance is usually modelled by the p-y method recommended in the offshore guidelines (OGL). Several investigations presented in the literature indicate that the head displacements of large-diameter monopiles are underestimated for extreme loads but overestimated for small operational loads. An extensive evaluation of the OGL method is presented here using three-dimensional numerical simulations. The evaluation has shown that the OGL method is not applicable for the design of large-diameter piles. Moreover, modified p-y formulations presented in the literature accounting for the effect of the pile diameter are also not generally suitable for piles with arbitrary dimensions and load levels. Therefore, the derivation of a new p-y approach is presented in detail. The new approach consists of “basic p-y curves” that are valid for a pile of infinite length exhibiting a constant horizontal deflection. In an iterative scheme, these basic curves are adapted depending on the pile deflection line and the pile length to account for a more realistic bedding resistance along the pile shaft. A comprehensive parametric study with 250 pile-soil systems reveals that the new p-y approach is able to predict the horizontal loadbearing behaviour as well as the local pile-soil interaction quite realistically. x | |||||
Perau, Eugen; Zillmann, Antonia | Variation des Reibungswinkels bei der Bemessung von Baugrubenwänden mit der Finite-Elemente-Methode | geotechnik | 4/2015 | 289-303 | Fachthemen |
KurzfassungIm vorliegenden Beitrag werden anhand zweier exemplarischer Systeme von Verbauwänden Berechnungen mit der Finiten-Elemente-Methode (FEM) durchgeführt. Es handelt sich um eine einfach rückverankerte Spundwand sowie eine zweifach ausgesteifte Spundwand, bei denen der berechnete Erddruck, die Spannungen am Erdwiderlager, die Biegemomente der Verbauwand, die Stützkräfte, die Wandverformungen sowie die Gesamtstandsicherheit untersucht werden. Variiert werden dabei der Reibungswinkel sowie die Aushubtiefe. Als ein erstes Ergebnis der Parameterstudie wird der Einfluss des Reibungswinkels auf die für die Bemessung der Systeme relevanten Berechnungsergebnisse diskutiert. x | |||||
Floroiu, Laurentiu; Schweiger, Helmut F. | Parametric study of the seismic ground response of a linear visco-elastic soil layer improved by stone columns or pile-like elements | geotechnik | 4/2015 | 304-315 | Fachthemen |
KurzfassungThis paper presents a qualitative investigation on how soil improvement influences ground response during earthquake events. The paper focuses on how modifications to stiffness, damping ratio and unit weight of soil reflect on the amplification functions. The study is carried out by means of finite element analyses using a linear visco-elastic material model and rigid bedrock conditions. The accelerogram recorded during the 1989 Loma Prieta (USA) earthquake is used as bedrock input motion. The results of this study suggest that under certain conditions the seismic load on the structures could be increased or decreased by changes of the eigenfrequencies and amplification functions of the natural ground conditions due to soil improvement. x | |||||
DGGT-Mitteilungen 4/2015 | geotechnik | 4/2015 | 316-320 | DGGT-Mitteilungen | |
KurzfassungPreis für Lebenswerk 2015 der Werner Möbius-Stiftung ging an Prof. Heerten x | |||||
Persönliches: geotechnik 4/2015 | geotechnik | 4/2015 | 320 | Persönliches | |
KurzfassungHans-Burkhard Horlacher verstorben (von Jürgen Giesecke, Georg Heerten, Jürgen Stamm) x | |||||
Tagungsberichte: geotechnik 4/2015 | geotechnik | 4/2015 | 323-326 | Tagungsbericht | |
Kurzfassung8. Freiberger Geotechnik-Kolloquium 2015 - Abschiedskolloquium Prof. Dr. Herbert Klapperich (von Nandor Tamaskovics) x | |||||
CBTR-Nachrichten: geotechnik 4/2015 | geotechnik | 4/2015 | 326-328 | CBTR-Nachrichten | |
KurzfassungCBTR-Tiefbaurechtspreis für Prof. Dr.-Ing. Martin Ziegler x | |||||
Projekt Cogan - Kompetenz in geotechnischen Analysen | geotechnik | 4/2015 | 328 | geotechnik aktuell | |
Reviewer geotechnik 2015 | geotechnik | 4/2015 | 329 | Reviewer | |
35 Jahre GuD Geotechnik und Dynamik Consult GmbH | geotechnik | 4/2015 | 329 | Firmen und Verbände | |
Termine: geotechnik 4/2015 | geotechnik | 4/2015 | 330 | Termine | |
Inhalt: Mauerwerk 4/2015 | Mauerwerk | 4/2015 | Inhalt | ||