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World Tunnelling Congress
WTCThere are 1984 documents.
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In-situ fire test to assess tunnel lining fire resistance
Abstract: Tunnels are important elements in road infrastructure. However, as the demand for longer tunnels is growing, the increased traffic volumes can result to potential hazards. Under fire loads concrete tends to spall resulting to a collapse of the tunnel structure. In this paper the in-situ fire test in a tunnel is presented. This was made possible with the design and...
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Providing the Right Geotechnical Exploration and Testing Data for Closed-Face Soil Tunneling
Abstract: Site investigation methods for both soil and rock tunnels must continuously improve to keep up with the increasing demands posed by rapidly developing tunneling technology. Earth Pressure and Slurry Pressure Balance TBMs require data to reliably predict face pressures, optimum muck weights or volumes, abrasion, stickiness, muck conditioning agents, safe haven locations,...
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Earthquake resistant joint for underground structure against longitudinal seismic displacement
Abstract: Some underground structures have experienced significant damage by earthquake, and it is recognized that the most critical deformation mode of underground structure constructed near the ground surface is the longitudinal compression-extension mode. Earthquake resistant joints are often applied against this mode, and the effectiveness is recognized by experience. However, the effect have not...
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Linking physical wall roughness of unlined tunnels to hydraulic resistance – The Tunnel Roughness project
Abstract: Hydropower tunnels are a vital component in Norwegian hydropower systems, both for transporting water and controlling releases of flood flows. How much water can be conveyed depends on a number of factors such as the cross sectional area and the friction from the tunnel walls. Norwegian hydropower tunnels are generally unlined and energy losses have mostly been quantified before commissioning...
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Innovative One-pass Lining Solution for Doha’s Deep Tunnel Sewer System
Abstract: Large diameter sewer tunnels can be built with either a two-pass or one-pass lining to protect the structural concrete from aggressive sewer gases, thereby lowering a tunnel’s maintenance needs and extending its life cycle. The use of a one-pass lining can reduce the construction schedule, save capital costs and improve overall quality. A one-pass lining solution is being applied for the first...
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Planning, design and construction of the WestConnex underground motorway project, Sydney, Australia
Abstract: WestConnex is a new urban motorway scheme in Sydney, Australia aimed at relieving the current severe congestion on the city’s road network. Over 70% of the total route length of 33 km will be accommodated in 3 or 4 lane tunnels with significant underground interchange works. The project was first proposed in its current form in 2012. However, in the relatively short time since two of the...
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The Design and Construction of Grouting against Water Ingress in the Headrace Tunnel for the Uma Oya Project, Sri Lanka
Abstract: The 15.2km long headrace tunnel (HRT) is a key component of the Uma Oya Multipurpose Development Project (UOMDP). The HRT takes water from Dyraaba Dam to the pressure shaft that feeds the power house. The excavation of the major 4.30m diameter headrace tunnel is done by using a double shield TBM. This is the first use of a TBM in Sri Lanka. High water...
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Design of Segmental Linings with Macro Synthetic Fibre Reinforcement
Abstract: Fibre reinforced concrete is becoming widely utilized in segmental linings due to improved performance and durability of the segments. Further, significant cost savings can be achieved by replacement of traditional rebar cages with fibres. Macro synthetic fibres (MSF) are non-corrosive and thus ideal for critical environments. Recent publications have now...
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Sprayed concrete strength monitoring using thermal imaging at Bond Street Station Upgrade
Abstract: As a sprayed concrete lined tunnel is advanced, it is important to monitor the strength development of sprayed concrete to ensure the workers are not at risk from falls of sprayed concrete, and that the lining has sufficient strength to support the ground loads and maintain stability of the tunnel. This is usually achieved using a combination of needle penetrometer and stud driving tests in a...
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Drill Plan Handling for Increasing the Quality of the Excavated Tunnel Profile and Reducing Time and Cost in...
Abstract: In civil tunneling time and cost are closely related, the contractors usually run their projects with time reduction as a major target. However, keeping the excavated tunnel profile as close as possible to the desired plan is equally important, thus minimizing extra cost and the risk of penalties. When the tunnel profile shape or size changes, or when rock...
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Alternative performance-based seismic design for tunnels in soft soils at Mexico City New International Airport
Abstract: For the Mexico City New International Airport, six tunnel structures are being designed for utilities, public road and ground service equipment. They have a total length of 8 km. The design of these tunnels has been challenging given the very soft soil conditions, heavy airplane and seismic loads. The Mexican Valley is well known for the particular soils and severe damages caused to...
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Jobergtunnelen – the first use of NATM in Norway
Abstract: The article describes the pre-construction and construction phase of the soil section of the Joberg tunnel, the first tunnel in Norway where the principles of the New Austrian Tunnelling Method were used on a planned basis. Brief account is given of the geological and geotechnical conditions at the site, extent of ground investigation and the technical solution of...
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The Westlink Gothenburg Optimization of Tunnels and Underground Stations
Abstract: The Westlink is a commuter rail link in the central part of Gothenburg. It will improve the existing sack station to a through-station with connections to the existing railway lines. It is 8km long, comprising bridges, 6km of tunnels and three underground stations, lying in rock, clay and below ground water level. As an urban project it underpasses several roads, tramways, facilities and...
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On the role of the Engineering Geologist in the Construction Phase of Challenging Tunnel Projects
Abstract: Independently, if hardrock or soil conditions, conventional or mechanized tunnelling - the role of the engineering geologist as an „interpreter“ of the naturally formed subsurface conditions is undergoing significant changes in the course of the planning and realization process of any tunnel project. Even with the most detailed and most competent site investigation risks for adverse subsurface...
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Sprayed Waterproofing Membranes on recent SCL Tunnelling Projects in London
Abstract: The London tunnelling sector has been very active in recent years with many tunnels constructed using Sprayed Concrete Linings (SCL), often incorporating a sprayed waterproofing system between the primary and secondary linings. This paper discusses the use of a sprayed waterproofing membrane in tunnels constructed using the SCL method at the Bond Street...
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The Follo Line project – The use of a new innovative system for scanning in a drill and blast excavation
Abstract: On the Follo Line project in Oslo, currently Norway’s largest transport project, Amberg Technologies supports the construction with surveying systems, services and know-how for the drill and blast lot in Oslo. For the first time a new system was used which allows scanning, positioning and processing of point clouds close to real time. With the intuitive tablet software you can immediately...
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