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World Tunnelling Congress
WTCThere are 1984 documents.
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Intelligent Longitudinal Ventilation Control of Long Road Tunnels
Abstract: Jet fans are installed in tunnels to ensure air condition by producing airflow forward in longitudinal ventilation. Longitudinal ventilation promises a qualified environment by producing appropriate air volume according to the traffic condition in tunnel. However, previous longitudinal ventilation system are mostly manual controlled and always takes a long period to react when adjusting its air...
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Quantitative methodologies for the fire risk assessment of road tunnels
Abstract: After the tragic events of Mont Blanc (39 fatalities), Tauern (12 fatalities) and St. Gotthard tunnels (11 fatalities) occurred in the years 2001-1999 in Europe, the importance of tunnels in human, economic and cultural terms have been recognized and addressed through the Directive 54/2004/EC [1]. This aims at fixing minimum safety requirements for tunnels longer than 500 meters in the...
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Cyber security of tunnel control centres
Abstract: The interlinkage between different modes of mobility, dense infrastructure networks and the urbanization of the population demand a reliable, safe and secure transport infrastructure. Any impairment, disturbance or failure of that interlinkage would have a substantial impact on the economy and major segments of the population. In this context, tunnel control centres are responsible for...
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Numerical study on water jet fire extinguishing system for performance verification
Abstract: This paper describes numerical simulation on the water jet extinction system for systematic verification of its performance applied in double deck tunnel in great depth underground space. Numerical model applied is 2D Eulerian multiphase model, and its results is validated with the equation of motion and experiment. Simulation results show that volume fraction of water at all nozzle outlet...
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Fehmarnbelt fixed link safety aspects and risk based approach
Abstract: Connecting Central Europe and Scandinavia
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High Density Foams for Soil Conditioning in EPB-Tunnelling
Abstract: To assure a homogenous face support pressure for EPB tunnel drives in closed mode, the soil needs to have a low permeability, suitable workability and plasticity. In this situation, the excavated soil acts as the support medium and helps to ensure a stable tunnel face and prohibits uncontrolled infiltration of water into the excavation chamber and the screw conveyor. Strongly varying coarse...
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Substantive double cutterhead TBM experiments realize electricity conservation
Abstract: TBM operations require huge amounts of electricity. In reducing the amount of electricity required by the cutter drive unit a double cutterhead system that allows for greater energy conservation during excavations using a TBM has been developed as an improvement to the conventional single cutterhead system. The double cutterhead system is an energy conservation technique that optimizes the...
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Drone Based Deformation Monitoring at the Tunnel Project Zentrum am Berg
Abstract: In the contribution a new drone based deformation monitoring system is presented that is currently developed by Geodata Group, 3GSM GmbH and Georesearch Forschungsgesellschaft mbH in the funded EUREKA research project Defdrone_3D and practically tested at the recently started Austrian tunnel project Zentrum am Berg (ZaB). The system is designed for monitoring the 3D displacements of structures...
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Innovative management of geological data as a tool for safe tunnelling
Abstract: The construction of a tunnel in hard or soft ground requires adaptation to the material provided by the prevailing geological conditions, whose history of origin, properties, three-dimensional structure and groundwater conditions all have to be taken into account. Geologists at the site work within a team of experts. Their job is to observe and to evaluate the encountered geological,...
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Optimization of Tunnel Seismic operations for fast and continuous investigations ahead of the face
Abstract: The knowledge of the geological ground conditions and its geotechnical parameters is still the major problem for driving of a tunnel. Although, underground construction works are increasingly carried out under difficult soil and rock conditions. Significant geological boundaries that cut the tunnel axis can cause serious problems such as large break-outs, collapses, flooding and rush-ins during...
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Pumping the muck with EPB machines – Considerations about the soil conditioning.The examples of two hydraulic...
Abstract: During the tunnel excavation with EPB machines, the traditional mucking operations with horizontal belt conveyor is sometimes replaced by the use of piston pumps to move the muck from the TBM to the tunnel portal. When this mucking technique is selected, the soil conditioning plays a key role for the improving of the whole excavation process, giving the contractor several advantages in terms of...
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The Kinetic Energy of Abrasive Particles Considering Specific Gravity in Waterjet Rock Cutting
Abstract: Waterjet technology has been increasingly applied to civil engineering such as rock excavation or concrete demolition from its various advantages. However, recent performance studies, based on the complex influence of the waterjet systems, lack sufficient theoretical approaches to be adequately applied to civil engineering. In particular, research on the particle kinetic energy is important for...
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Pressure distribution in EPB pressure chambers: New insights from computational flow simulations
Abstract: In mechanized tunneling construction with Earth Pressure Balance (EPB) machines, the conditioned excavated soil paste inside the chamber is employed as the support medium. Information on the actual pressure distribution in the chamber is important to evaluate the effective safety of the tunnel face against loss of stability. On job-sites, pressure sensors are often installed on the bulkhead and...
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Failure modes of the steel lining of underground reservoirs for compressed air energy storage (CAES)
Abstract: Compressed air energy storage (CAES) in caverns, shafts or tunnels makes use of the high resistance of the surrounding rock mass to the gas pressure. A lined rock cavern (LRC) is the most attractive concept. The gas pressure is borne by the rock, while the tightness of the system is guaranteed by a composite lining consisting of an inner thin steel shell and an outer reinforced concrete shell....
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Mechanized cross-passage construction in soft soil under high pressure: the Tuen Mun - Chek Lap Kok link – northern...
Abstract: The Tuen Mun - Chek Lap Kok Link - Northern Connection Sub-sea Tunnel Section project, in Hong-Kong, involved among others the construction of two 14m tunnels, linked by emergency egress cross-passages at regular intervals. The construction of these 57 cross-passages in soft ground under high water pressure was a real challenge to the entire project, both in terms of programme and construction...
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Key performance parameters of single-component grouting mortars in mechanized tunnelling – systematic laboratory...
Abstract: In mechanized tunnelling a so-called annular gap with a width of up to 20 cm remains between the segment lining and the surrounding soil. Soon after mounting of the segment rings, the annular gap must be filled with an adequate grouting mortar to stabilize the tunnel lining and to minimize settlements of the ground surface. Thereby, two contradictory requirements are demanded on such annular...
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