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World Tunnelling Congress
WTCThere are 1984 documents.
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The longest freeway tunnel maintenance in Taiwan
Abstract: Taiwan’s currently operating highway tunnels with length of more than 1 kilometer have already reached 112 Km, of which freeway tunnels account for 65 Km. As the length of tunnel continues to increase, its inspection and maintenance become more and more important. The longest tunnel in Taiwan - Hsuehshan tunnel (the 12th longest in the world) will be introduced at first. Then it is explained...
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The mandatory resolutions as an opportunity. The case of ecological corridor and Biodiversity Project in Susa Valley
Abstract: TELT is the public promoter of the Mont Cenis Base Tunnel characterised by a strict regulatory context and a strong opposition movement. In view of the expansion of the main Italian construction site, TELT faced an important challenge: the valley is the habitat of a butterfly species (found by the opponents) included in the EU Habitat Directive. This subject has become an attractive topic for...
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The Performances of Four EPB-TBMs in Twin Tunnels Driven in a Complex
Abstract: This paper is a summary of a research study on the performance of four identical EPB-TBMs in twin tunnels of a Metro Project which is being under construction in Istanbul, two TBMs advancing in front of the others. There are three different geologic formations in the area, with often met shear zones and dyke intrusions. There are a limited number of research studies on predicting the...
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The Riser Concept: vertical upward pipe jacking from inside an underwater Tunnel
Abstract: Pipejacking is a well-known technique that is traditionally adopted for horizontal and sub-horizontal applications. However, jacking pipe segments vertically and from inside an underwater tunnel, which was never made before, required the development of a new construction methodology. The method, known as “Riser Concept”, has been developed to build vertical risers by excavating and jacking...
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The role of trenchless methods for underground cables and future energy supply
Abstract: The development of renewable energies and the construction of a sustainable power grid are the challenges for future energy supply. Due to the public environmental awareness, smart installation methods are required for fast and safe construction with minimal impact on surroundings. There are three major application fields for trenchless technologies in transmission grid construction: the...
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The second Gotthard road tunnel tube bundling of infrastructure through the Alps
Abstract: The Swiss Federal Roads Office (FEDRO) has just initiated the work on the second 16.9-kilometre motorway tunnel tube through the Gotthard. The project will prove to be another outstanding feat in the Alpine region. It is a contribution to innovative solutions for a sustainable society with the implementation of synergies of the ‘free’ space in the road infrastructure and the first bundling of...
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The SLAC Matter in Extreme Conditions Experimental Hall Cavern
Abstract: The SLAC National Accelerator Laboratory (SLAC) is operated by Stanford University as a contractor for the United States Department of Energy (DOE). SLAC supports a large national and international community of scientific users performing cutting edge research in support of the DOE mission. The Matter in Extreme Conditions Upgrade Facility Project (MEC-U) will reconfigure and upgrade the MEC...
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The Tunneling Validation - a ranking-based back analysis on massive data streaming
Abstract: After the completion of the 31,5 Km of tunnels, we had to face a challenging task. While daily back analysis was in the established procedures and contributed greatly to the quality and reliability of the excavation control process, at the end of the tunneling the Owner required a further validating process on each one of the excavated rings, aiming to close the hand over protocol and NCR if...
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The two -component grouta double approach for the Young’s modulus assessment
Abstract: The two-component grout is nowadays the most widely used technology in mechanized shielded tunneling for the backfilling process. Despite its wide use, very little information is currently available on the study of its mechanical properties and their evolution as a function of the curing time. Furthermore, in several construction sites the need has recently emerged to verify the compliance of...
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Thessaloniki Metro Extension Technical Challenges during Interstation Tunnelling
Abstract: The present case study refers to the design of the twin tunnels bored by TBM/EPB along the first Interstation of Thessaloniki Metro Extension to Kalamaria district. Four major challenges were encountered during tunnelling this section. The alternatives examined and the final solutions adopted by Project Owner ATTIKO METRO S.A. and the Contractor are herein presented. Firstly, the twin tunnels...
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Three -dimensional modelling of tunnelling in closed mode
Abstract: In an urbanised context, the prediction of movements induced by the excavation of shallow tunnels is a major challenge for both designer (conceptual design) and contractor (detailed design). In the case of mechanised tunnelling with a closed mode tunnel boring machine, the significant number of machine control parameters makes predictive three-dimensional modelling complex. Simplifications are...
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Total Convergences Modelling in Tunnelling a tool for Designers and Contractors
Abstract: One of the main problems in underground excavations regarding geotechnical monitoring, especially when excavated with drill and blast, is the late installation of the instruments, namely convergence’s sections. Due to the applied construction methods, the minimum distance, defined on Monitoring and Observation Plans, to which the convergence profiles must be installed, is usually exceeded. This...
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Towards Optimum Control and Operation of Tunnel Ven tilation Systems
Abstract: Ventilation design for normal and emergency conditions is frequently carried out based on purely steady-state considerations. While this is allowable to some extent in comparatively simple cases, there are situations, where this approach completely fails. In such situations both ventilation and ventilation-control design must take dynamic effects into account. This is particularly important for...
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Transforming old railway tunnels to modern road tunnels. Three case studies from
Abstract: Since the decay of the railway services in Chile, several railway tunnels built at the beginning of the 20th century were abandoned and later used as part of the road network. Nevertheless, they do not satisfy modern road standards and there is a necessity to enhance its safety and availability conditions. This article describes three case studies developed by the Ministry of Public Works:...
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Tunnel Baukau - crossing a railway embankment with low overburden
Abstract: An approx.. 740 m long trough and tunnel construction is to be built at the intersection „Autobahnkreuz Herne“. The new route crosses a railway embankment. The 60 m long tunneling through the railway embankment is to be executed with a protection of a piperoof. The piperoof consists of 21 steelpipes (d=1,6 m). The pipe jacking was proceeded „under rolling wheel“ with an overburden of only 2,5m....
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Tunnel Construction under Important Traffic based on Real-timeMonitoring
Abstract: The Kaga Tunnel of Hokuriku Shinkansen is a tunnel with a length of approximately 5.5 km, being constructed between Ishikawa Prefecture and Fukui Prefecture by the conventional method. The major challenge in the middle area of the Kaga Tunnel is to construct under important traffic structures which are crossing to the tunnel, such as "Route 8" (National Road), "Hokuriku Railway" (main railway),...
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