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Kohlbock B.,IGT Geotechnik und Tunnelbau ZT GmbH | Moser H.,Asfinag Bau Management GmbH
Geomechanik und Tunnelbau | Year: 2010

The extent of tunnel refurbishment has increased constantly in recent years. The particular importance of meticulous and thought-out planning has been demonstrated on recent projects. The original drawings often provide an insufficient basis for design work and have to be checked, verified or supplemented by targeted investigation measures. A brief glance at the list of claims from a refurbishment project can clearly demonstrate the potential savings, which could have been produced by relatively cheap investigations. For the planning and design of the refurbishment of the first tube of the Tauern Tunnel, many staged investigation surveys were therefore carried out. The investigation measures carried out and their results and effect on the design and tender documents for the refurbishment of the existing tube of the Tauern Tunnel are described in this article. © 2010 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Posch H.,IGT Geotechnik und Tunnelbau ZT GmbH | Nahold M.,GUT GRUPPE UMWELT TECHNIK GMBH | Kager M.,OBB Infrastruktur AG | Kolb E.,OBB Infrastruktur AG | And 2 more authors.
Geomechanik und Tunnelbau | Year: 2015

Contract KAT2 will altogether produce about 8.6 m. t of excavated material. Most of this will be used as fill for various purposes or processed as aggregates for concrete production. This article deals with the management of the material excavated from the tunnel and of material, which has been affected by ground improvement measures or could have been contaminated during excavation or transport. Causes for chemical problems and risks with waste are identified, and possibilities and solutions for technically correct recycling or disposal in compliance with the conditions of waste management law are presented. As an example, the influence of selected additives such as cement or resin foam is discussed. There is also a description of investigation results into the evidence that high concentrations occur in the determination of iron and aluminium in the eluate. These parameters are of significance for the recycling of rock since they are limited under the Austrian federal waste management plan (BAWP). Im Baulos KAT2 fallen insgesamt rund 8,6 Mio. t Tunnelausbruchmaterial an. Der überwiegende Teil wird als Schüttmaterial mit unterschiedlichen Verwendungen verwertet oder für die Herstellung von Gesteinskörnungen zur Betonherstellung aufbereitet. Dieser Beitrag behandelt den Umgang mit Tunnelausbruchmaterial und mit Material, das durch gebirgsverbessernde Maßnahmen beeinflusst wird oder das im Löseprozess und dem Transport verunreinigt werden kann. Ursachen für abfallchemische Auffälligkeiten und Risiken werden aufgezeigt; Möglichkeiten und Lösungen für die fachgerechte Verwertung oder Beseitigung unter Einhaltung abfallrechtlicher Rahmenbedingungen werden vorgestellt. Exemplarisch wird der Einfluss ausgewählter Hilfsstoffe wie Zement oder Harzschaum diskutiert. Beschrieben werden auch Untersuchungsergebnisse zum Nachweis, dass bei der Bestimmung von Eisen und Aluminium im Eluat hohe Konzentrationen auftreten. Diese Parameter sind für die Verwertung des Gesteins von Bedeutung, weil sie nach Bundesabfallwirtschaftsplan (BAWP) begrenzt sind. © 2015 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Burger D.,Ingenieurburo fur Geotechnik | Kohlbock B.,IGT Geotechnik und Tunnelbau ZT GmbH | Schoitsch C.,SPP Spirk and Partner ZT GmbH
Geomechanik und Tunnelbau | Year: 2010

The construction of the 6,545 m long second tube of the Tauern Tunnel required a well thought-out concept for the disposal and reuse of the material excavated from the tunnel. Because the reuse of the excavated material had been assigned the highest priority for saving resources according to the Waste Management Law (AWG), the project also included a number of officially approved earthworks projects. This article gives an overview of the considerations and challenges, which arose during the design and construction phases with regard to the disposal and reuse of this material. Particular attention is paid to embankment filling to raise the level of the Tauernalm service area, where about 235,000 m3 of tunnel spoil was filled in only three months. The article also describes the particular challenges of geotechnical design, supervision and logistics on this project, and also the overall mass balance of the tunnel excavation, which had to be adapted a number of times during the construction phase due to altered project parameters and had to be considered as a direct interaction with the tunnelling concept. © 2010 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Herzfeld T.,Magistratsabteilung 29 Bruckenbau und Grundbau | Leitner A.,IGT Geotechnik und Tunnelbau ZT GmbH | Gartner I.,Ingenieurburo ste.p ZT GmbH
Geomechanik und Tunnelbau | Year: 2014

As in most of the large European cities, the attractiveness of public transport is also an important matter for the inhabitants of Vienna. For this reason, the Vienna underground railway network has been continuously extended since its inception in 1978. At the moment, the extension of the Line U1 to the south is under construction, with about 50 % running underground and the rest either elevated or at ground level. Construction started in 2012 and the section should open in 2017. Part of this section is contract U1/10 Troststrasse, which runs underground. The tunnels mainly pass through loess and loess-loam soils, and are favourably above the free groundwater table so that only perched groundwater had to be pumped out of wells in the area of the tunnels. The running tunnels are being constructed according to the principles of the New Austrian Tunnelling Method (NATM). The station tunnels for track 2 are also being tunnelled according to the NATM although measures to reduce settlement were essential to comply with the requirement for the permissible tangential inclination of buildings. After various methods had been evaluated, a combination of a horizontal jet grout canopy supported on vertical jet grout columns was chosen. The shafts and the tunnel for track 1 were constructed in cut-and-cover with contiguous bored piles to support the excavation. © 2014 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Walter H.,Ingenieurkonsulent fur Bauingenieurwesen | Kitzler C.,IGT Geotechnik und Tunnelbau ZT GmbH
Geomechanik und Tunnelbau | Year: 2011

The value of geotechnical measurements for the evaluation and prediction of the effects of construction and repair measures as well as for the production of geotechnical and structural models in geotechnical and underground construction is indisputable. In practice, however, it sometimes turns out that the required statements cannot be derived from the available data with sufficient reliability. This article presents three examples of measurement programmes and discusses their strengths and weaknesses. One of the examples concerns a classic mined excavation in soft soil, another the measurement programme in a pivot tunnel for the estimation of swelling potential and the third the improvement of slope support measures while maintaining traffic. The importance of a timely start to measurement and a sufficiently high measurement frequency adapted to the results of the measurements and the progress of construction are demonstrated. A sufficiently long run of measurements after the completion of construction is also desirable. Various types of measurements and observations should be matched to each other and integrated. The results of laboratory tests, large-scale experiments and structural calculations - if available - should also be included in this integration. Continuity of measurements should be ensured, for example, by sufficient redundancy even if individual data are lost. Documentation should permit rapid interpretation of the overall situation. © 2011 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co.

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