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World Tunnelling Congress
WTCThere are 1984 documents.
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Analysis of multilateral interaction between shotcrete, yielding support and squeezing ground by means of two...
Abstract: Squeezing behaviour, which might be observed in tunnelling through the weak ground under high in-situ stresses, yield large deformations at tunnel boundaries. To control this ground convergence and provide tunnel stability, it is essential to implement some precaution measures such as implementing the yielding supports. These yielding elements are installed and embedded between the lining...
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Advanced Developments in Steel and RC Immersed Tunnels
Abstract: By the help of recent advanced technologies and innovative solutions in steel and reinforced concrete immersed tunnels, very deep and very long sea crossings under challenging ground and environmental conditions becomes feasible and competitive. Sandwich or hybrid immersed tunnels are popular in Japan where both internal and external surfaces are constructed by structural steel plates. Steel...
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Accidental loads on Immersed tunnels
Abstract: Accidental loads on Immersed tunnels : Regular loads on immersed tunnels are most of the time straight forward. The dominant loads are mainly permanent and specified by soil, water and self-weight. Next to the permanent loads, variable loads will act on the tunnel. Regular variable loads are defined by traffic, temperature and tidal water differences. In nowadays design the awareness on...
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A study on the trend of the deformation that has occurred in the railway tunnel
Abstract: Tunnel constructed more than 50 years ago is over 50 percent out of railway tunnel owned by our company at present, and also the ratio will be over 90 percent in 20 years later. It is expected that the numbers of engineers decrease under the influence of the declining birthrate in the future, and also the number of aged tunnels increase. And therefore, efficient inspection and maintenance will...
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A Study on the Mechanical Behavior of Pipe Curtain with New Interlock Joint in a Large Pipe Curtain-Box Jacking Project
Abstract: The development of underground space in urban area has been challenging in recent years, especially where there are underpass crossing roads with heavy traffic and where they are highly protected for environmental reasons. The pipe curtain-box jacking method has been applied in several such projects, because it causes minimal disturbance. However, experience gained from large section pipe...
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A Study on the Construction and Maintenance Plan for Freeze-Thaw Damage Mitigation Technology Using Carbon Nano Tube
Abstract: Tunnels in cold regions are exposed to various freezing environments such as freeze-thaw and snowing depending on the climatic characteristics. Thus There are many problems in maintenance of lining, road surface and portal due to the freezing and thawing repetition.The problem of durability causing by freezing is typically the frozen road surface, the increase of the lining back earth pressure...
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A new method for structural health evaluation of shield tunnel
Abstract: In bored tunnel design, most recent structural design models for tunnel linings concentrate on the behaviour of the tunnel lining in the long-term. The load on the tunnel lining in these models is derived from the original soil stresses, often simplified for a single homogeneous layer. Field observations show that higher loads may occur in the initial hours after the assembly, that might effect...
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The Case for the ‘Do Nothing’ Solution for two Heritage-Listed Brick Lined Tunnels Impacted by Motorway Construction...
Abstract: This paper describes the process taken to arrive at the ‘do nothing’ solution for the structural assessment of two heritage listed brick lined tunnels that were to be subjected to construction induced loadings during the excavations of large cuttings for an adjacent expressway.The Hunter Expressway Alliance (HEA) designed and constructed a 12.9 km length stretch of the Hunter Expressway in New...
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A Simplified Quantitative Risk Assessment for the Insurability of Tunnel Projects
Abstract: Tunnels are unique engineering structures and their design and construction are associated with greater risks in comparison to other engineering structures. These greater risks become even further evident as tunnels are increasingly being designed and constructed to very large dimensions in excess of 15 m in size through difficult geological conditions and within sensitive, urban environments....
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A Numerical Study on Mechanical Behav iour of Cross Passage Constructed by Arti ficial Ground Freezing Method
Abstract: In subsea tunnel constructions, where water pressure is higher than 20 bars, the convention grouting technologies are restricted to apply because they cannot implement appropriate water cut-off. For these extreme conditions, the artificial ground freezing (AGF) method can be an effective alternative, especially for constructing cross passages of a subsea tunnel through highly-fractured fault...
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Advanced Developments in Steel and RC Immersed Tunnels
Abstract: By the help of recent advanced technologies and innovative solutions in steel and reinforced concrete immersed tunnels, very deep and very long sea crossings under challenging ground and environmental conditions becomes feasible and competitive. Sandwich or hybrid immersed tunnels are popular in Japan where both internal and external surfaces are constructed by structural steel plates. Steel...
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Shaft and tunnel construction for deep sewer systems
Abstract: With a growing world population and increasing urbanization, volumes of sewage are rising especially in large cities, which require larger capacities in sewage transport and treatment. The systems built decades ago need to be modernized, extended or replaced to ensure efficient and sustainable wastewater management.The first large-scale Deep Tunnel Sewerage System (DTSS) was installed in 2008...
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E4 Stockholm Bypass, Data Administration During the Construction Phase
Abstract: The project Stockholm Bypass is located west of Stockholm city centre to decrease the north-south road traffic through Stockholm and linking together and develop the external and regional cores. The bypass consists of more than 50 km of rock tunnels which will be constructed by using the method of drill and blast. As well of the means of this large scale and complex project and the overall...
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Reinforced Concrete Tunnel Junctions: Design and Construction Guidelines
Abstract: Whilst junctions between a tunnel and another tunnel, shaft, or other underground structure typically account for only a small proportion of the total length of a tunnelling project, their design and construction invariably present significant challenges. These challenges manifest themselves during the excavation and the installation of both the initial and permanent support. While many...
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Predicting the long-term behaviour of rock masses in tunneling
Abstract: Being able to predict how the rocks will behave and deform in underground environment over time using practical tools and applied methodologies can lead to design optimization preventing projects delivery delays and cost overruns. Especially in the case of underground nuclear waste repositories where their lifetime is estimated to be over one million years. However, in tunnelling engineering...
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Enhancing the Ductility of Fibre Reinforced Concrete for Tunnel Lining s
Abstract: Recent work has shown that hoop thrust in a tunnel lining is potentially useful for enhancing the ductility of fibre reinforced concrete sections in bending. Tests have demonstrated that under the action of an axial compressive stress, an FRC section that ordinarily displays strain-softening behaviour in pure bending can exhibit a form of ‘structural’ deflection-hardening behaviour [1]. This is...
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