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World Tunnelling Congress
WTCThere are 1984 documents.
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Determining radius of influence of the face in EPB shield tunneling by finite difference method
Abstract: For the purpose of understanding the three-dimensional behavior of face tunnel, a three-dimensional finite difference simulation model, which includes all relevant shield tunneling components and allows for the modeling of the step-by-step construction process of the tunnel advance. The soil-structure interaction in shield tunneling is investigated by numerical solution. The results of...
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How to turn geological uncertainty into manageable risk?
Abstract: Risk management became an integral part of most underground construction projects during the last decade. Still, there are parties, who may not plan for insubstantial unknown uncertainties of ground conditions because they are so unpredictable and out of scope of normal planning as they think. Finally, many of them end up as the most catastrophic events. Even known geological uncertainty is a...
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Planning and Realization of Deep Shafts in Tunnel Projects in Switzerland and Austria
Abstract: Several huge rail tunnel projects are currently under construction in Europe. In order to reduce the construction time for long tunnels at great depth intermediate headings have to be planned and realized by building deep shafts. The shafts serve as points of attack for tunneling and/or as ventilation shafts during construction as well as during operation of the facility. The...
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Effect of tail void grouting on the surface settlements in soil of low permeability
Abstract: In shield tunneling the tail void grouting is a common practice to control the surface settlements. Generally surface settlements in a soil of low permeability occur during a tunnel construction but also during a long period after completion of the tunnel. The long-term settlements are mainly due to consolidation around the tunnel. The consolidation process is caused...
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Geotechnical challenges during the execution of Bucharest 5 metro line
Abstract: The route of the future 5 metro line crosses Bucharest city from West to East, subcrossing the historical city center, crowded by old buildings significantly impacted by earthquakes in 1940, 1977, 1986 and 1990. “The geotechnical challenges” caused by the complexity of the characteristic elements of the metro route test the knowledge of the designers of subway-related...
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Experience Gained at New Subway Line U5, Berlin – Presentation of the Stations
Abstract: The existing U5 underground line in Berlin currently ends at Alexanderplatz station in Berlin-Mitte. It is planned to close a gap of approximately 2.2 km in the section between the existing tunnels at Berliner Rathaus and Brandenburger Tor station. The line includes three new stations (Berliner Rathaus, Museumsinsel and Unter den Linden). Design and execution of the 3 stations hold, due to...
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Experience Gained at New Subway Line U5, Berlin Presentation of the TBM Tunnel
Abstract: The existing U5 underground line in Berlin currently ends at Alexanderplatz station in Berlin-Mitte. It is planned to close the gap of approximately 2.2 km in the section between the existing tunnels at Berliner Rathaus and Brandenburger Tor station. The line is set to run through downtown from the new Berliner Rathaus station to be built below the Spree, underneath the future Berlin Palace...
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Sustainable urbanization through underground development – towards an urban underground future
Abstract: Our globe is experiencing unprecedented growth in urban populations. The corresponding sprawl of existing urban areas and the explosion of new cities and urbanizing regions is occurring at rapid speed. Often infrastructure development cannot keep up. The resource land is being used up at alarming rates. Efforts are going on in many cities and urbanizing regions to contain the sprawl and to...
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Industrialisation of the construction process for the Solbiate Olona tunnel by using “jet-grouting” technology
Abstract: The Solbiate Olona tunnel represents a very significant project, solving the problem of interference between the “Pedemontana Lombarda” Motorway alignment and one part of the Solbiate built area, overlooking the Olona Valley. After a long stretch of cut & cover tunnel, the tunnel passes underground through gravelly-sandy ground, beneath various residential...
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Effect of Construction Cessation on Tunnel Stability in Completely Weathered Granite Stratum
Abstract: Cessation, taking place often in tunnel construction due to various reasons, usually cause tunnel collapse in weak ground if the cessation time is long. Dongkeling tunnel on GuizhouGuangxi line being as the engineering background, the 3D viscoelasto-plastic rheological model was established to find the evolving rules of deformation at critical locations such as the tunnel crown, arch springing...
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Tunnelling Under the Sydney Opera House: The Vehicle Access and Pedestrian Safety Project
Abstract: The current traffic arrangements for servicing the Sydney Opera House (SOH) necessitates that delivery vehicles share the open forecourt and boardwalk areas with visitors, complicating logistics and resulting in several incidents per year. The Vehicle Access and Pedestrian Safety (VAPS) project was initiated in order to separate vehicle and pedestrians by diverting freight...
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The Use of Macro-synthetic FRS for Safe Underground Hard Rock Support
Abstract: Numerous changes in technology and procedures have progressively been implemented over recent years with the objective of reducing hazards in underground excavations and enhancing long-term performance. Among the most significant in terms of improved safety during construction has been the introduction of Fibre Reinforced Shotcrete (FRS) using remotely operated equipment as this has...
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On the compatibility between support elements in a rock support system for underground excavation
Abstract: An underground rock support system usually comprises a number of internal and external support elements. All the elements should be compatible in their deformability in order to achieve a satisfactory support effect, particularly in squeezing and burst-prone rock conditions. The concept of the so-called yield rock support has been widely accepted in tunneling and mining engineering, but the...
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Influence of Construction Method on Shaft Design
Abstract: This paper considers the design of a number of shafts of varying size, constructed using diaphragm walling techniques in the Middle East. The walls were constructed to full depth in loose sand and layered rock, to facilitate the rapid construction programme. The design process revealed that the loads on the walls were substantially affected by construction...
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Stabilisation of soil pillar adjacent to Eastern Ticket Hall at Bond Street Crossrail Station
Abstract: Sprayed concrete lining (SCL) tunnelling alongside the secant pile walls forming the Eastern Ticket Hall (ETH) box at Bond Street station left a narrow pillar of clay, less than 1m wide in places, between the piles and the tunnel lining. Since the tunnelling was to occur after excavation of the box, the stability of this soil pillar during excavation was identified as a concern. This paper...
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Delivering a Safe Integrated SCL Design: The Challenges and Successes of Crossrail Contract C300/C410
Abstract: The SCL primary lining was designed to withstand the various temporary conditions and also formed part of the composite permanent works design. Retaining design responsibility for the composite SCL primary and secondary lining design with one party (Mott MacDonald (MM)), whilst ensuring that the Contractor retained responsibility for excavation and temporary support...
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