3G Gruppe Geotechnik Graz

Graz, Austria

3G Gruppe Geotechnik Graz

Graz, Austria
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Schubert W.,University of Graz | Blumel M.,University of Graz | Staudacher R.,3G Gruppe Geotechnik Graz | Brunnegger S.,University of Graz
Geomechanik und Tunnelbau | Year: 2017

Special considerations are required for the support of tunnels in fault zones. On the one hand, standard support elements are not compatible with the imposed displacements. On the other hand, local shearing can cause damage to the lining already at rather small displacements magnitudes. Cracks in the lining frequently are observed, when the geometry of the tunnel changes, or at the intersection with cross passages. As strengthening of the lining in many cases cannot prevent damage, temporarily leaving an open gap in the primary lining. Implementing yielding elements into the lining is as well feasible, as economical increasingly replaces the traditional method of leaving open gaps. This results in a better utilization of the lining's capacity and a considerable reduction of displacements. As the lining with integrated yielding elements develops considerable thrust, a transfer of the loads via the construction joints is required. Thus, careful construction of those joints is essential. Another problem can be the bond between bolt, grout, and rock mass, as the bolts are installed, when the displacement rate is highest, and the strength of the grout still low. This paper deals only with phenomena caused by discontinuities and large displacements, and does not address other hazards, like flowing ground. Copyright © 2017 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin

Handke D.,Universitatsstr 142 | Nolden M.,Universitatsstr 142 | Mussger K.,Geoconsult ZT GmbH | Steidl A.,3G Gruppe Geotechnik Graz
Geomechanik und Tunnelbau | Year: 2010

The very variable geological conditions require two completely independent machine concepts for contract KAT3 of the Koralm Tunnel, which have been taken into account with the planned use of a shield machine capable of being rebuilt. This article discusses the essential constructional requirements for machinery and construction methods based on the current state of design and knowledge. © 2010 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co.

Schubert P.,IC consulenten ZT GesmbH | Holzl H.,Geoconsult ZT GmbH | Sellner P.,3G Gruppe Geotechnik Graz | Fasching F.,3G Gruppe Geotechnik Graz
Geomechanik und Tunnelbau | Year: 2010

One of the main goals of the ground investigation for the Koralm Tunnel project was the detailed investigation of the Lavanttal fault systemwhich lies in the contact between the Koralm crystalline and the neogenic formations of the Lavanttal. The above-ground investigation programme (mapping, core drilling, geophysics) was able to deliver the first estimation of the geological, hydrogeological and geotechnical rock conditions of the fault zone many hundreds of metres thick (fig. 1). The Paierdorf investigation tunnel, which has now been constructed, clarified the thickness and the internal structure of the fault zone as well as the hydraulic and mechanical rock properties along the tunnel. Equally important was the practical experience gained by tunnelling through the fault zone. The knowledge gained from the Paierdorf investigation tunnel will be used in further design work for the mechanical driving of this very heterogeneous region of rock. © 2010 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co.

Goricki A.,3G Gruppe Geotechnik Graz | Pimentel E.,ETH Zurich
Rock Mechanics and Rock Engineering | Year: 2015

The Semmering Base Tunnel, a major railway tunnel project in Austria with a length of around 27.3 km was to be constructed through significant fault zones. The geotechnical parameters of the cataclasites especially in combination with high ground water pressure were of high importance for the geotechnical tunnel design. Advanced triaxial tests considering the ground water condition as well as the high primary stress level were performed to gain information about the behavior of the weak rock mass. The ground material tested in the triaxial test consists of highly crushed and faulted phyllites and schists and was explored during the ground investigations for the Semmering Base Tunnel project.

Gschwandtner G.G.,IC Consulenten | Hohndorf M.,OBB Infrastruktur AG | Ubleis M.,3G Gruppe Geotechnik Graz
Geomechanik und Tunnelbau | Year: 2015

The Granitztal tunnel chain, located after the Koralm Tunnel in a southward direction and adjoining the new IC station in the Lavanttal, essentially consists of the Deutsch Grutschen and Langer Berg Tunnels, which are being excavated cyclically, and the Granitztal gallery in cut-and-cover. The article offers a general overview of the project, described the geological and geotechnical conditions and compares the experience gained in the current early construction phase with the underlying conditions for design and tendering. Die Tunnelkette Granitztal in südlicher Richtung gesehen nach dem Koralmtunnel sowie anknüpfend an den neu zu errichtenden IC Bahnhof im Lavanttal umfasst im Wesentlichen die Tunnel Deutsch Grutschen und Langer Berg, die im zyklischen Vortrieb aufgefahren werden, sowie geographisch dazwischenliegend die Einhausung Granitztal, die in offener Bauweise erstellt wird. Der Beitrag gibt eine allgemeine Projektübersicht, beschreibt die geologischen und geotechnischen Verhältnisse und betrachtet die in der aktuellen frühen Bauphase gewonnenen Erkenntnisse mit den der Planung und Ausschreibung zugrunde liegenden Gegebenheiten. © 2015 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Radinger A.,Pöyry | Fasching F.,3G Gruppe Geotechnik Graz | Pack G.,3G Gruppe Geotechnik Graz | Kreutzer I.,Vienna University of Technology | Kostial D.,Pöyry
Geomechanik und Tunnelbau | Year: 2014

On contract KAT2 at the 33 km long Koralm Tunnel, two hard rock double shield TBMs are currently boring a total distance of about 17 km each through the Koralm crystalline. Due to the forecast ground conditions, particularly localised fault zones and aquiferous areas, systematic exploration is being undertaken to provide continuous prediction of ground conditions. The intention is only ever to bore through already explored rock through the consistent application of the standardised method adapted to suit the tunnelling. The exploration system being used is mainly based on probe drilling (rotary hammer and core drilling) and the seismic method. With the assistance of the geophysical exploration system TSWD disturbed areas of the rock mass can be detected up to a distance of about 150 m ahead of the machine. Thereby the source of the seismic waves, which propagate into the rock mass, is the cutting process of the TBM cutterhead. The supplementary and targeted use of hammer and core drilling, which can be drilled up to about 100 m ahead, enables the direct exploration of any fault zones and aquiferous regions and the evaluation of their characteristics and the effect to be expected on tunnelling. In order to evaluate the behaviour of the system and to verify the predictions, the geologists and geotechnicians on site perform continuous analyses of the machine data [1] and the geological documentation. This has led so far to good and reliable prediction results. © 2014 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Brino G.,Polytechnic University of Turin | Peila D.,Polytechnic University of Turin | Steidl A.,3G Gruppe Geotechnik Graz | Fasching F.,3G Gruppe Geotechnik Graz
Geoingegneria Ambientale e Mineraria | Year: 2015

Excavation by Tunnel Boring Machines is the tunnelling method most frequently used nowadays in long infrastructural projects, in a wide range of geological conditions. In the last 40 years, many prediction models were developed to estimate TBM performance and cutter wear, using as input geological parameters. The research gives an overview of the existing penetration models for hard rock TBMs, identifies the most frequently used input parameters and summarizes the characteristics of the datasets on which the models are based on. Theoretical background is tested through the example of Koralm tunnel project, a 32.9-km-long base tunnel in Austria, in a 1000-m-long portion of the South tube in the construction lot KAT 2. The outcomes shows that the estimation of the penetration is reasonably accurate when applying models that are based on a database consistent with the project data, especially in terms of geology and typology of machine used in the excavation. The article proposes a design method for a system of TBM data analysis and prediction at the construction stage, based on a back-analysis process about machine data in different geological conditions. The methodology can be applied in any other project and the system is particularly useful in long tunnels, in which a continuous improvement of the ability of prediction can have an effective impact on time and costs.

Sellner P.J.,3G Gruppe Geotechnik Graz | Sonnleitner H.,OSTU STETTIN Hoch und Tiefbau GmbH
Geomechanik und Tunnelbau | Year: 2016

In 2013 Asfinag published the tender for the construction of the second tube of the Gleinalm Tunnel. The tunnel is situated in hard rocks (gneiss) and the tender design contained excavation works realized by “drill and blast” in a top heading, bench and invert sequence. Additionally to this tender design, technical alternatives were allowed. One of the tenderers, the later contractor, offered both, a concept according to the tender and an alternative excavation concept including full face excavation by drill and blast. This alternative was based on considerations and experience the tenderer had gained from the construction works of the first tube in the early 1970s presuming optimal full face excavation conditions over wide areas of the tunnel and thus reducing time and costs. Due to these economic advantages and the low cost risk the owner finally commissioned the alternative. Minimizing the blasting vibration of the full face excavation on the nearby running tube, which was operated without any disturbance, was only one of the challenges of the project. In terms of logistics the supply of the excavation works with air and support materials as well as the huge mucking volume to be transported were identified as limiting factors. Das im Jahr 2013 ausgeschriebene Vortriebskonzept für die zweite Röhre des Gleinalmtunnels hat den Ausbruch grundsätzlich als Sprengvortrieb in den Teilquerschnitten Kalotte, Strosse und Sohle vorgesehen, jedoch auch technische Alternativen zugelassen. Durch die später beauftragte Bietergemeinschaft wurde neben dem Hauptangebot auch eine Alternative eingereicht, die über weite Bereiche des Tunnels den Sprengvortrieb im Vollausbruch beinhaltet, und auf geologischen und geotechnischen Überlegungen beruht. Aufgrund der Wirtschaftlichkeit und Kostensicherheit wurde die Alternative beauftragt. Die Minimierung von Sprengerschütterungen im Zuge des Vollausbruchs im Zusammenhang mit der parallel verlaufenden und in Betrieb befindlichen Bestandsröhre stellt nur eine Herausforderung dar, die es zu bewältigen galt. Logistisch gesehen befand sich die Versorgung der Vortriebe im Grenzbereich des Machbaren. © 2016 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin

In order to preserve the environment and save resources, Austrian Railways ÖBB have decided to recycle material excavated from contract KAT 2 of the 32.9 km long Koralm Tunnel and process it as aggregates for concrete production. This leads to a saving of gravel resources, reduction of transport routes and reduction of the required landfill areas. The rock mass, which is predominantly formed of schistose gneisses and gneisses with inclusions of mica schist, amphibolites and marbles, is being bored by tunnel boring machines. The material excavated from the tunnel is being recycled on site by processing for concrete aggregates. © 2013 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Fasching F.,3G Gruppe Geotechnik Graz | Vanek R.,3G Gruppe Geotechnik Graz
Geomechanik und Tunnelbau | Year: 2011

Brittle fault zones are among the geological formations, which demand particular attention during the design phase and also during the construction of underground structures. The characterisation of fault zones is one of the essential interdisciplinary tasks in the fields of engineering geology and geotechnics. The forecast of the rock mass model and detailed knowledge about the mechanical properties of the various fault rocks are of particular significance. The complexity of fault zones and their relevance for construction make it necessary to implement a projectspecific characterisation of the rock mass, which describes the relevant geological, hydro-geological and geotechnical rock mass conditions. In addition, the construction and economic background of each project has to be taken into consideration in order to get practical information for the tunnel design team. Considering this, a clear path from investigation, through the development of the engineering geological ground model, to geotechnical design and construction planning and construction is essential. The article summarizes the significant characteristics of fault zones and presents their practical implementation in a project- specific classification and description of types of fault rocks and fault zones. The intention is to illustrate the engineering geological characterisation of fault rocks and fault zones in order to provide the data needed for geotechnical and construction design. © 2011 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

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