Artikeldatenbank
Autor(en) | Titel | Zeitschrift | Ausgabe | Seite | Rubrik |
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Hering, Marcus; Scheerer, Silke; Curbach, Manfred; Vo, Duy Minh Phuong; Sennewald, Cornelia; Cherif, Chokri; Liebold, Frank; Maas, Hans-Gerd; Qinami, Aurel; Steinke, Christian; Fuchs, Alexander; Kaliske, Michael; Curosu, Iurie; Mechtcherine, Viktor | Impaktsicherheit von Baukonstruktionen durch mineralisch gebundene Komposite: Bauteilebene | Beton- und Stahlbetonbau | 1/2021 | 58-67 | Aufsätze |
KurzfassungZiel des seit 2017 durch die Deutsche Forschungsgemeinschaft (DFG) geförderten Graduiertenkollegs GRK 2250 ist die interdisziplinäre Erforschung von Methoden zur Erhöhung des Impaktwiderstands von Bauwerken durch nachträgliche Verstärkung. Der vorliegende Beitrag gibt einen Einblick in die GRK-Forschung auf Strukturebene. Mineralisch gebundene Verstärkungsschichten wurden auf der dem Impakt abgewandten Bauteilseite untersucht. Als Material für diese Schichten kamen feinkörnige Matrices ohne und mit Kurzfasern zur Anwendung, deren Wirksamkeit in der Impaktverstärkung durch die Einbettung verschiedener Textilien variiert wurde. Derartig verstärkte Platten wurden in einer Fallturmanlage einer Impaktbelastung ausgesetzt. Ein wichtiger Indikator für die Effektivität einer Verstärkungsmethode ist die Beurteilung der Schädigung. Hierzu wurde unter anderem eine Methode zur Analyse von Rissmustern durch Bildsequenzanalyse entwickelt. Die Experimente dienten des Weiteren als Referenz für die Simulation der Rissausbreitung in den impaktbeanspruchten Bauteilen mit der Phasenfeldmethode. x | |||||
Beton- und Stahlbetonbau aktuell 1/2021 | Beton- und Stahlbetonbau | 1/2021 | 69-72 | Beton- und Stahlbetonbau aktuell | |
KurzfassungNachrichten: x | |||||
Kongresse - Symposien - Seminare - Messen | Beton- und Stahlbetonbau | 1/2021 | 73-74 | Veranstaltungskalender | |
Long-term observation of geotechnical structures | Geomechanics and Tunnelling | 1/2021 | Cover Pictures | ||
KurzfassungThe Pflaurenz Tunnel, which is roughly 1 km long, is being built to provide a bypass which relieves pressure on the St. Lorenzen municipality in South Tirol. Half of the tunnel (approx. 417 m) passes through loose rock and was driven by excavators. To provide advance support, the innovative AT - Pipe Umbrella System with 139 [mm] squeezed connection developed by DSI Underground was successfully used in the loose rock sections of the Pflaurenz Tunnel to quickly and safely connect the tubes when driving the tunnel. (photo DSI Underground) x | |||||
Content: Geomechanics and Tunnelling 1/2021 | Geomechanics and Tunnelling | 1/2021 | Contents | ||
Geomechanics and Tunnelling: Table of contents Volume 13 (2020) | Geomechanics and Tunnelling | 1/2021 | Annual table of contents | ||
Schubert, Wulf | Long-term observation of geotechnical structures - Langzeitbeobachtung von geotechnischen Strukturen | Geomechanics and Tunnelling | 1/2021 | 2 | Editorials |
News: Geomechanics and Tunnelling 1/2021 | Geomechanics and Tunnelling | 1/2021 | 3-13 | News | |
Kurzfassung
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People: Geomechanics and Tunnelling 1/2021 | Geomechanics and Tunnelling | 1/2021 | 13-15 | People | |
KurzfassungDipl.-Ing. Dr.techn. Harald Lauffer - 80th birthday x | |||||
Grunicke, Urs H.; Lienhart, Werner; Vorwagner, Alois | Long-term monitoring of visually not inspectable tunnel linings using fibre optic sensing / Langzeitmonitoring von nicht visuell inspizierbaren Tunnelinnenschalen mittels Faseroptik | Geomechanics and Tunnelling | 1/2021 | 19-32 | Topics |
KurzfassungRegular structural assessments of tunnel linings are commonly performed by visual inspection. Crack phenomena and their development over time are essential indicators of changes of the stress regimen. These are the most prominent input data for the structural assessment of linings. Cladding for fire protection or noise control inhibit visual inspection and call for alternative methods of crack detection and monitoring. This paper presents the application of an alternative method which employs distributed fibre optic sensing (DFOS) which is installed on already existing linings. The objective is to obtain monitoring results with best reliability in comparison to conventional inspection. While the application of DFOS with fibres embedded in new linings has already been tested extensively, later installation on existing linings poses various challenges. Based on findings obtained from laboratory and field tests in an operational highway tunnel, we found that by means of later installed fibres with lengths of up to 70 m, strain measurements can achieve accuracies of about 1 &mgr;m/m over 10 mm. This allows the detection of both current and historical crack widths at 0.01 mm precision, conspicuous strain patterns and temperature abnormalities. The system can be mounted onto the inner lining surface which is covered by later claddings and are hence inaccessible to visual inspection. The structural performance can eventually be inferred from interpreted crack patterns. x | |||||
Moritz, Bernd; Heissenberger, Roman; Schachinger, Tobias; Lienhart, Werner | Long-term monitoring of railway tunnels / Langzeitüberwachung von Eisenbahntunneln | Geomechanics and Tunnelling | 1/2021 | 35-46 | Topics |
KurzfassungAt the large infrastructure projects of the Austrian Federal Railways in the Alpine region geotechnical structures with different characteristics are encountered. Especially heterogeneity and composition of fault zones associated with different stress conditions are a great challenge during tunnelling. Although the system behaviour resulting from ground-support interaction is measured by monitoring methods, after completion of tunnel works with installation of the inner lining usually the tunnel is no further monitored. The goal of ÖBB-Infrastructure AG is to apply robust, reliable and durable monitoring systems for the observation of geotechnical relevant structures during a service life of the tunnels of 150 years. Thereby unfavourable tendencies of system behaviour shall be detected early and measures in terms of predictive maintenance planned in due time to ensure high availability of the tunnels during operation. The paper presents the implementation of long-term monitoring at the projects Koralm Tunnel and Granitztal Tunnel and gives an outlook at the Semmering Base Tunnel. x | |||||
Keuschnig, Markus; Schober, Andreas; Delleske, Robert; Brandner, Katharina; Höfer-Öllinger, Giorgio | Scale-oriented landslide monitoring and early warning system for uranium legacy complexes in Mailuu Suu, Kyrgyzstan | Geomechanics and Tunnelling | 1/2021 | 47-53 | Topics |
KurzfassungRadioactive waste and the legacies of uranium mining combined with massive landslides pose tremendous risks to vast areas of Kyrgyzstan and their inhabitants. These risks comprise the potential destruction of radioactive legacies and thus, the mobilisation of radioactive material through streams and rivers into intensively cultivated agricultural areas. To tackle these challenges, a scale-oriented landslide monitoring and early warning system (LMEWS) was developed to increase the safety of Kyrgyz uranium legacy complexes in the Mailuu Suu region, southern Kyrgyzstan. The LMEWS utilizes cutting-edge technologies like satellite- and ground-based InSAR as well as Unmanned Aerial Systems (UAS) to ensure flexibility, transferability, and maximum protection against vandalism. x | |||||
Radon i , Nedim; Sattlegger, Elisabeth; Lacourse-Dontigny, Xavier; Mitsch, Thomas | Designing a state-of-the-art monitoring system in challenging operating conditions | Geomechanics and Tunnelling | 1/2021 | 54-62 | Topics |
KurzfassungThe construction joint venture NouvLR is constructing the new light rail network in Montreal. One of the major challenges is the advance below the existing runways and taxiways of the Montreal-Trudeau International airport and the construction of the subway station below the airport. The airport must remain under operation during the construction, and very tight requirements have been imposed regarding the tolerable surface settlements and availability of the monitoring data. The regulations regarding operations of the airport and possible presence of foreign objects in vicinity of its runways and taxiways represent an additional challenge, requiring usage of less straightforward monitoring concepts. The works for the installation of the monitoring equipment must be closely coordinated with airport operations and require a reliable schedule. x | |||||
Golser, Johann; Steiner, Walter | International and European standards for geotechnical monitoring and instrumentation / Internationale und europäische Normen für geotechnische Überwachung und Instrumentierung | Geomechanics and Tunnelling | 1/2021 | 63-77 | Topics |
KurzfassungGeotechnical monitoring and instrumentation are indispensable parts of the Observational Approach. in tunnel design and construction. They are an essential requirement for a proper risk management. Since 2013 several standards, valid both in Europe under CEN and international under ISO, were developed dealing with geotechnical monitoring. Five standards have been published by 2020, covering general rules, extensometer, inclinometer, piezometer and pressure cells. Further standards on settlement measurements, strain monitoring and load cells are in progress and will be published in the next few years. x | |||||
Wilfing, Lisa; Michael, Joachim; Schütz, Dirk | Risk assessment of route options for the Hanau-Würzburg/Fulda railway project / Risikoabschätzung von Varianten im Bahnprojekt Hanau-Würzburg/Fulda - Optimised exploratory concept and application of BIM in early project phases / Optimiertes Erkundungskonzept und Anwendung von BIM in frühen Projektphasen | Geomechanics and Tunnelling | 1/2021 | 78-88 | Topics |
KurzfassungIn the course of the preliminary planning of the new Gelnhausen-Fulda railway line which is part of the railway project Hanau-Würzburg/Fulda, two route options with tunnels, bridges, cuts and embankments are to be investigated and assessed as efficiently as possible with regard to potential geotechnical risk areas. Due to the geological and hydrogeological conditions within the north-eastern Hessian Buntsandsteingebirge, several groundwater levels, landslides in tunnel portal areas and karstification structures are to be expected on the two route options, each of which is approx. 45 km long. In order to obtain detailed and, above all, large-scale knowledge of geotechnical hazards of each route = in the preliminary stage of the exploration programme, geophysical surface investigations are a cost- and time-optimized exploration method in addition to standard drilling. These findings as well as existing subsurface information are combined by means of BIM, so that risk areas can be identified at an early stage of the project and taken into account when selecting the most affordable route. x | |||||
Lutz, Robert; Zizka, Zdenek; Röchter, Lars; Thewes, Markus | Surface settlements caused by mechanised tunnelling in hard rock with heterogeneous tunnel face conditions - Empirical and numerical calculations using the example of Boßler Tunnel / Oberflächensetzungen bei maschinellen Tunnelvortrieben im Festgestein bei heterogener Ortsbrust - Empirische und numerische Berechnungen am Beispiel des Boßlertunnels | Geomechanics and Tunnelling | 1/2021 | 89-104 | Topics |
KurzfassungAn empirical and a numerical calculation model were developed to predict the surface settlements due to EPB tunnelling in hard rock with heterogeneous face conditions. For this purpose, surface settlement and TBM driving data from Boßler Tunnel were considered. The TBM launching area characterised by a low overburden (z/D < 2) and a nature conservation area at surface was examined. The developed models were calibrated against the measured surface settlements of the first eastbound tube and were used to predict the surface settlements of the subsequent westbound tube. The prediction was then compared to the actual measured settlements during the excavation of the westbound tube. From this, findings for future settlement predictions in similar ground conditions were derived. It could be shown that both models are suitable for the application in the investigated subsoil conditions and can be used successfully in practice in different phases of the project development. x | |||||
Site Reports: Geomechanics and Tunnelling 1/2021 | Geomechanics and Tunnelling | 1/2021 | 105-106 | Site Reports | |
KurzfassungNew entry to Gadertal: AT - Pipe Umbrella System safeguard Plaurenz Tunnel - Neue Einfahrt ins Gadertal: AT - Rohrschirme sichern Tunnel Plaurenz x | |||||
Technical Reports: Geomechanics and Tunnelling 1/2021 | Geomechanics and Tunnelling | 1/2021 | 106-109 | Product Informations | |
KurzfassungRemote monitoring of flexible protective control structures to avert natural hazards - Fernüberwachung von flexiblen Schutzverbauungen gegen Naturgefahren x | |||||
Diary of Events: Geomechanics and Tunnelling 1/2021 | Geomechanics and Tunnelling | 1/2021 | 109-110 | Diary of Events | |
Titelbild: geotechnik 1/2021 | geotechnik | 1/2021 | Titelbild | ||
KurzfassungZum Titelbild: x | |||||
Inhalt: geotechnik 1/2021 | geotechnik | 1/2021 | Inhalt | ||
geotechnik: Inhaltsverzeichnis des 43. Jahrgangs 2020 | geotechnik | 1/2021 | Jahresinhaltsverzeichnis | ||
Vrettos, Christos | Eine außergewöhnliche Situation | geotechnik | 1/2021 | 1 | Editorials |
Kosmann, Benedikt; Perau, Eugen | Beschreibung der Festigkeit von Fels unter echten triaxialen Bedingungen mit der Grenzbedingung nach Mogi-Coulomb | geotechnik | 1/2021 | 2-13 | Aufsätze |
KurzfassungDurch Untersuchungen von Fels unter echten triaxialen Bedingungen kann der Einfluss der mittleren Hauptspannung auf das Versagen gezeigt werden. Für numerische Berechnungen von Tunneln und Bohrlöchern, bei denen die mittlere und kleinste Hauptspannung nicht identisch sind, wären Grenzbedingungen vorteilhaft, die den Einfluss der mittleren Hauptspannung berücksichtigen. Mit der in den Sonderfällen triaxialer Extension und Kompression mit Mohr-Coulomb identischen Grenzbedingung nach Mogi-Coulomb kann dieser Einfluss berücksichtigt werden. Um echte triaxiale Grenzzustände besser abbilden zu können, wird in diesem Aufsatz die modifizierte Grenzbedingung nach Mogi-Coulomb untersucht, in der die Grenzbedingungen nach von Mises, Drucker-Prager und Mohr-Coulomb als Spezialfälle enthalten sind. Um Anwendungsmöglichkeiten aufzuzeigen, werden der Ursprung, die Fließfläche im Spannungsraum, der Einfluss der Parameter, die Konvexität und die Parametergewinnung aus Laborversuchen behandelt. x | |||||
Henke, Sascha | Numerische Untersuchungen zum Einfluss von Reaktionspfählen auf statische Pfahlprobebelastungen | geotechnik | 1/2021 | 14-23 | Aufsätze |
KurzfassungIn diesem Beitrag wird im Rahmen einer numerischen Variationsstudie der Einfluss von Reaktionspfählen auf das Last-Verformungs-Verhalten des Probepfahls im Rahmen von statischen Pfahlprobebelastungen untersucht. Hierbei werden die Einflussfaktoren lichter Abstand der Pfähle untereinander, Pfahllängen, Länge der Reaktionspfähle im Verhältnis zur Probepfahllänge sowie die Anzahl der Reaktionspfähle untersucht. Es zeigt sich, dass bei einigen Konfigurationen die Empfehlungen des Arbeitskreises “Pfähle” (EA Pfähle) der Deutschen Gesellschaft für Geotechnik e. V. (DGGT) hinsichtlich des einzuhaltenden Mindestabstands der Pfähle zueinander nicht ausreichend sind, um einen Einfluss der Reaktionspfähle auf das Tragverhalten des Probepfahls zu vermeiden. x |