Artikeldatenbank
Autor(en) | Titel | Zeitschrift | Ausgabe | Seite | Rubrik |
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Handke, Dieter; Edelhoff, Dennis | Quality and risk management strategy for mechanized tunnelling - From machine concept to process controlling / Qualitätssicherungselemente und Risikomanagementstrategie für den maschinellen Tunnelbau - Vom Maschinenkonzept zum Prozesscontrolling | Geomechanics and Tunnelling | 3/2016 | 222-233 | Topics |
KurzfassungMechanized tunnelling is a highly technical construction process, which requires the establishment of precise objectives to consistently guarantee high quality and safety standards while still considering the aspects of time and cost reduction. In the tendering and construction phases, these objectives can be met by the application of a risk management strategy and the integration of quality assurance elements. The implementation of process controlling with the objectives optimization, error prevention and documentation provides a centralized monitoring element in the construction phase. External experts can monitor tunnelling activities in real time and submit recommendations in case of deviations. With downstream analyses, incidents can be evaluated and methodological errors identified. x | |||||
Gehwolf, Paul; Walter, Andreas; Galler, Robert; Wagner, Hanns | Shear tests on flexible shear dowels for use at cross passages with thin segmental linings / Scherversuche von flexiblen Scherdübeln für den Einsatz bei Querschlagsanschlägen mit schlanken Tübbingauskleidungen | Geomechanics and Tunnelling | 3/2016 | 234-242 | Topics |
KurzfassungFor the driving of cross passages in mechanized tunnelling, different systems can be used for load transfer at the cross passage opening. With thin segmental linings, achieving high load-bearing capacity of the precast lining and the load transfer elements used pose a great challenge. For the selection of a system, not only the required support measures but also practical construction aspects such as the integration of the load transfer elements into the precast element and the installation of the elements play an important role. The use of shear dowels as a connection and load transfer element between segment rings in the cross passageoffers new possibilities in mechanized tunnelling. Particularly in connection with thin segmental linings, flexible systems of plastic with integrated steel core make it possible to resist loads with large deformations, both in the radial and longitudinal directions. In order to investigate the system behaviour of the overall system of segmental lining with thin construction and plastic shear dowels, shear tests were performed at the Chair for Subsurface Engineering of the Montanuniversität Leoben with a dowel system as the connecting element between segments. The objective of the research project initiated by the ÖBB-Infrastruktur AG is to determine the effects of different reinforcement concepts on the load-bearing capacity of the connection system. Ways of determining the failure of the construction element based on crack detection are also described. x | |||||
Vigl, Alois; Walter, Andreas; Lemmerer, Johann; Atzl, Georg; Handke, Dieter | TBM research project - Tolerances segmental lining / TVM-Forschungsprojekt - Toleranzen Tübbingausbau | Geomechanics and Tunnelling | 3/2016 | 243-259 | Topics |
KurzfassungIn infrastructure tunnelling projects with shielded TBMs, prefabricated segmental linings are used with various systems and requirements. The required degree of accuracy in segment production and ring assembly is a considerable factor in terms of equipment, time and costs. The required tolerances for segments and ring assembly depend significantly on the segment geometry, lining system and field of application. In order to provide a reasonable basis for allowable segment and installation tolerances, a new approach has been established as part of a research initiative of the ÖBB-Infrastruktur AG with respect to the risks and consequences arising from geometrical tolerances. The paper explains the concept of “tolerance classes” with the approach for their developments, derivation and classification. A practical application example is shown in addition. With respect to the nomenclature of tolerances, a harmonization process has been performed in collaboration with the German committees for underground structures, ZTV-ING and DAUB. The results of harmonizing and proposals of tolerance clarifications are presented within this paper. x | |||||
John, Max; Matousek, Federico; Dallapiazza, Werner | Gotthard Base Tunnel - Comparison of forecast and findings regarding engineering geology and tunnelling / Gotthard-Basistunnel - Vergleich Prognose und Befund aus baugeologischer und tunnelbautechnischer Sicht | Geomechanics and Tunnelling | 3/2016 | 260-275 | Topics |
KurzfassungFor deep tunnels with restricted possibilities for site investigation, deviations from the forecast are usually to be expected. Deviations of geological and hydrogeological conditions have different effects on tunnelling. At the Gotthard Base Tunnel it was found that some areas considered as critical actually behaved most favourably, whereas other areas, such as fault zones and zones of high rock pressure, deviated unfavourably from the forecast with considerable effects on costs and the time schedule. Unfavourable deviations could not be compensated by favourable areas. It should be also noted that these deviations had not been included in risk analyses, because they were unknown, however the original cost prognosis of 1999 provided sufficient financial reserves. These deviations were mastered by intensive probing ahead of excavation and adaptation of design, construction programme and additional measures defined during construction. On the basis of the comparison of forecast and actual conditions, the positive and negative effects of the conditions encountered on tunnelling are described. x | |||||
Product Information: Geomechanics and Tunnelling 3/2016 | Geomechanics and Tunnelling | 3/2016 | 276-282 | Product Information | |
KurzfassungThe Klaus tunnel chain: DSI ground support products stabilize excavation of the new Eastern tubes / Die Tunnelkette Klaus: Stützmittel der DSI sichern Vortrieb der neuen Oströhren x | |||||
Semprich, Stephan | Kluckert, Klaus D.: Spezialtiefbau 2.0 - Durch Schaden wird man klug (in German). | Geomechanics and Tunnelling | 3/2016 | 283-285 | Book Review |
Diary of Events: Geomechanics and Tunnelling 3/2016 | Geomechanics and Tunnelling | 3/2016 | 285-286 | Diary of Events | |
Inhalt: Geotechnik 3/2016 | geotechnik | 3/2016 | Inhalt | ||
Witt, Karl Josef | Ist uns das Urteilsvermögen abhandengekommen? | geotechnik | 3/2016 | 167 | Editorials |
Grabe, Jürgen; Wu, Lingyue | Coupled Eulerian-Lagrangian simulation of the penetration and braking behaviour of ship anchors in clay | geotechnik | 3/2016 | 168-174 | Fachthemen |
KurzfassungSubmarine power cables are buried in the seafloor for protection against external threats such as ship anchors. The determination of the optimum burial depth is still an important research topic. This paper presents numerical simulations of the penetration and braking behaviour of ship anchors in a clayey seabed. The visco-hypoplastic constitutive model was applied to model the viscous behaviour of clay. The Runge-Kutta-Fehlberg 4/5 integration method was implemented in the coupled Eulerian-Lagrangian analysis in Abaqus/Explicit to improve the efficiency and accuracy of the calculation. The soil model and the integration method were validated with a benchmark test. In the numerical simulations, typical anchor behaviours were observed and the basic mechanisms of the penetration of ship anchors in clay were revealed. Varying the simulation parameters shows the main factors (anchor size, soil strength and dragging speed) influencing the penetration depth, providing important information for the risk assessment of submarine power cables in the future. x | |||||
Tinat, Christopher; Rosenberg, Matthias | Einfluss der Überkonsolidation auf das Sekundärsetzungsverhalten von Klei bei Wiederbelastung | geotechnik | 3/2016 | 175-183 | Fachthemen |
KurzfassungDas Sekundärsetzungsverhalten von weichen bindigen Böden stellt eine große Herausforderung für die moderne Baupraxis dar. Das Ziel von Vorbelastungsmaßnahmen ist neben der Vorwegnahme der Lastsetzungen des Bauwerks die bestmögliche Reduzierung der langfristig andauernden Sekundärsetzungen. Auf Grundlage der durchgeführten eindimensionalen Kompressionsversuche an Klei wurde der Einfluss einer Vorbelastung auf das Sekundärsetzungsverhalten bei Wiederbelastung belegt. Die Sekundärsetzungen eines Bodens können durch Überkonsolidation maßgeblich verringert werden. Dabei ist nicht nur das Überkonsolidationsverhältnis, sondern vielmehr das Differenzmaß der auf die Entlastung folgenden Wiederbelastungsspannung eine entscheidende Größe. Im Gegensatz zur Erstbelastung ist der Sekundärsetzungsbeiwert des Bodens bei einer Wiederbelastung spannungs- und zeitabhängig. Die Ergebnisse konnten anhand des C&agr;/Cc-Konzepts von Mesri unter Berücksichtigung des Prinzips der äquivalenten Spannung belegt werden. x | |||||
Schranz, Fabian; Fellin, Wolfgang | Stability of infinite slopes investigated with elastoplasticity and hypoplasticity | geotechnik | 3/2016 | 184-194 | Fachthemen |
KurzfassungIt is commonly assumed that the maximum slope angle &bgr; of an infinite cohesionless slope is equal to the friction angle of the soil &phgr;. However, this relation only holds for a dilatancy angle &psgr; equal to the friction angle if the Mohr-Coulomb failure criterion is employed. This article demonstrates that the increase in the soil strength due to the plane strain conditions in an infinite slope allows for using &bgr; = &phgr; as a conservative approximation for &phgr; < 35° and &psgr; > &phgr;/3. Further, the calculations presented here support the common practice in geotechnical engineering of using the strength parameters obtained from triaxial tests in limit state calculations such as Bishop's method without further consideration of the dilatancy. However, it seems to be more appropriate to use direct shear tests wherever possible, i.e. for fine-grained soils. x | |||||
Borchert, Kurt-M.; Große, Almuth | Veränderung der Boden- und Felsklassen in der VOB, Teil C (2015) | geotechnik | 3/2016 | 195-204 | Berichte |
KurzfassungMit Erscheinen des Ergänzungsbands 2015 zur VOB, Ausgabe 2012, wurden in allen ATV-Normen die bisherigen Klassen durch Homogenbereiche für Boden und Fels ersetzt. Zur Beschreibung der Homogenbereiche werden in diesen Normen, die nach Abschnitt 2 - Stoffe und Bauteile, den Baugrund behandeln müssen, Eigenschaften und Kennwerte vorgegeben, die in der Leistungsbeschreibung anzugeben sind. In diesem Artikel werden die Änderungen durch die Einführung der Homogenbereiche im Vergleich zu den bisherigen Klassen dargestellt und Hinweise für die Baugrunduntersuchungen und zugehörigen Planungen gegeben. x | |||||
Entacher, Martin; Fuchs, Bastian | Erfolgs-, Baugrund- und Systemrisiko - Eine Beispielsammlung für den Spezialtiefbau | geotechnik | 3/2016 | 205-211 | Berichte |
KurzfassungDer vorliegende Beitrag behandelt die rechtlichen Rahmenbedingungen der Beziehung Auftragnehmer (AN, Baufirma) und Auftraggeber (AG, Bauherr) in Bezug auf die Frage, wer bestimmte Risiken zu tragen hat. Der Fokus liegt dabei auf dem geschuldeten Werkerfolg (Erfolgsrisiko) sowie dem Baugrund- und Systemrisiko. Nach einer Einführung werden sechs fiktive Beispiele aus dem Bereich des Spezialtiefbaus vorgestellt, die sowohl einfache als auch komplexe Fälle mit Sondervorschlägen und Risikoverschiebungen abdecken. Neben den fiktiven Beispielen wird anhand der aktuellen Rechtsprechungspraxis schließlich gezeigt, wie die Zuordnung von Baugrund- und Systemrisiken von den Gerichten gesehen wird. x | |||||
DGGT-Mitteilungen: geotechnik 3/2016 | geotechnik | 3/2016 | 212-216 | DGGT-Mitteilungen | |
Persönliches: geotechnik 3/2016 | geotechnik | 3/2016 | 216-217 | Persönliches | |
Kurzfassung• In memoriam Prof. Dr.-Ing. habil. Helmut Meißner x | |||||
CBTR-Nachrichten: geotechnik 3/2016 | geotechnik | 3/2016 | 217-219 | CBTR-Nachrichten | |
Tamaskovics, Nandor | 9. Freiberger Geotechnik Kolloquium und THMC Kolloquium beim 67. Berg- und Hüttenmännischen Tag 2016 | geotechnik | 3/2016 | 220 | Tagungsberichte |
40 Jahre Smoltcyk & Partner GmbH | geotechnik | 3/2016 | 220 | Firmen und Verbände | |
geotechnik-Homepage nutzt erweiterte Funktionen der Wiley Online Library | geotechnik | 3/2016 | 220-221 | geotechnik aktuell | |
Termine: geotechnik 3/2016 | geotechnik | 3/2016 | 221-222 | Termine | |
Inhalt: Mauerwerk 3/2016 | Mauerwerk | 3/2016 | Inhalt | ||
Schoch, Torsten | Classified variety.... / Facettenreich geordnet.... | Mauerwerk | 3/2016 | 181-182 | Editorial |
Kreft, Oliver | Closed-loop recycling of autoclaved aerated concrete / Geschlossener Recyclingkreislauf für Porenbeton | Mauerwerk | 3/2016 | 183-190 | Fachthemen |
KurzfassungXella Technology and Research, in a pilot study with the Hamburg-based Otto Dörner GmbH waste management company and the Ytong plant in Wedel, has been testing since 2013 how and in what amounts autoclaved aerated concrete (AAC) remains from demolished buildings or from waste disposal sites can be reused for new AAC production. The processing of the salvaged AAC-material should conform to the current technical standard: return of mixed demolition rubble, separation of contaminants (by metal separation, air density separation, swim-sink separation, manual resorting), pre-treatment in the crusher and sieves for predetermined grain size ranges. This is where grain sizes or moisture content, heavy metals, bitumen, sulphate or other impurities are analysed in detail. The sorting accuracy as performed by Otto Dörner has shown to be sufficient for reuse through reintroduction into AAC-production. Up to 15 % salvaged AAC prepared in such a manner can be effortlessly reused. A sample production of AAC quality grade P4-0.55 with granulated salvaged AAC in the Ytong plant in Wedel was successful. x | |||||
Naumann, Kai; Schoch, Torsten | Example calculation of the sound insulation of a floor slab between residential units according to DIN 4109-2:2016 / Beispielhafte Berechnung der Luftschalldämmung einer Wohnungstrenndecke im Mauerwerkbau nach DIN 4109-2:2016 | Mauerwerk | 3/2016 | 191-203 | Fachthemen |
KurzfassungThe DIN 4109 series of standards has been revised in recent years and harmonised with European design codes. After the drafts of DIN 4109 were issued in November 2013, the documents shall now be finally published in summer 2016. x |