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World Tunnelling Congress
WTCThere are 1984 documents.
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Brussels Metro North: Design and Technical Challenges
Abstract: The new fully automated metro line of Brussels connects the northern district directly with the city centre passing densely built-up areas. The project itself includes the design and structural design of seven new stations, a 4.5km long single tube tunnel with parallel tracks, a depot, a maintenance centre and auxiliary infrastructures. This paper provides an overview of the status of the...
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Verification and Proposal of the Segment Design Method, Considering Construction Loads on Shield Curved Alignment...
Abstract: During shield tunneling at extremely great depths and under extremely high groundwater pressure, various construction loads, such as jack thrust, back-fill material injection pressure, tail grease pressure and tail brush pressure affect the segments of the ring to counter the action of high groundwater pressure. Since in recent years, the shield tunnel has been constructed at increasingly...
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LTA Contract T219: Platform Link between TEL Orchard Station and NSL Orchard Station
Abstract: The Thomson-East Coast Line (TEL) Orchard Station will serve as an Interchange Station between TEL and North-South Line (NSL). The platform link connecting TEL and NSL consists of an underpass across Orchard Boulevard and a new box structure underneath the existing NSL Orchard Station at a depth of approximately 30m below ground level. The underpass across Orchard Boulevard was constructed by...
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Effect of Soil Conditioning on the EPB-TBM Excavation Performance: A Case Study of Dudullu-Bostanci Metro Project,...
Abstract: The use of underground space for transportation, energy requirement, sanitation and wastewater management is continuously increasing in urban areas. Mechanical excavation of this underground space with Earth Balance Pressure Tunnel Boring Machine (EPBTBM) is one of the most preferred method beneath intensive urban areas. A good soil conditioning can reduce the surface settlement and create a...
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Innovations Introduced in the Mechanized Excavation of the Tunnel Included in the Extension Project of the Dubai Metro
Abstract: In this paper, we will describe two innovations introduced in the execution of the tunnel included in the extension project of the Dubai Metro, as result of lessons learned in previous Acciona Construction projects and that have proven be successful in their implementation. One aspect is the launching of the TBM in the starting portal with a reduced cover, saving time and obtaining better...
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Positive Experiences Obtained in the Execution of the Quito Metro
Abstract: In this paper, the reasons that have made it possible record performances have been achieved in the excavation with EPB tunneling machines in Quito Metro line 1, the influence of geology throughout its complete layout, the high professionalism of the operating crews who have handled the three tunnel boring machines used in their excavation and the increase in power required from the...
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Study on the Damage Evolution in Secondary Tunnel Lining Under the Combined Actions of Corrosion Degradation of...
Abstract: This article presents a numerical approach to study the damage evolution of secondary tunnel lining under the combined actions of corrosion of the preliminary support and the creep deformation of the surrounding rock. Three new models, including the tensile failure of corroding rock bolt, the yielding of corroding steel arch and the elastoplastic damage of concrete, were put forward and...
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Ventilation System in Large Hydro Projects in India: A Case Study of Successful Implementation of Effective...
Abstract: ITA-AITES World Tunnel Congress, WTC2020 and 46th General Assembly Kuala Lumpur, Malaysia 11-17 September 2020 Ventilation System in Large Hydro Projects in India: A Case Study of Successful Implementation of Effective Ventilation System at Tehri Pump Storage Project Rakesh Kumar Khali Group Project Manager Hindustan Construction Co. Limited, LBS Marg, Vikhroli, Mumbai – 400083 Abstract:...
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Accurately Assessing the Effects of Build Tolerances and Friction on Stress Distributions at the Longitudinal Joints...
Abstract: The longitudinal joints of precast concrete tunnel linings are subject to highly concentrated loads which result in bursting stresses. Joint failure due to bursting is a brittle mechanism that can be catastrophic. As tunnels get larger, the pressure to reduce lining thicknesses increases the risk of joint failure. Existing design methods involve simplifications of the stress distributions. Most...
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Design of Large Span and Shallow Ramp Tunnels
Abstract: The St. Peters Interchange ramp tunnels are situated at the northern end of the New M5 tunnels, part of the larger WestConnex project in Sydney, Australia. This paper presents an overview of the design for two large span and shallow cover ramp tunnels as designed for the New M5 tunnels. These ramps were excavated through the Ashfield Shale Formation, crossing dykes and faulted ground with a...
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Galleria Olmata, from Survey to Construction: An Integrated Design Approach for the Renewal of Railway Tunnels
Abstract: RFI (Rete Ferroviaria Italiana - Italian Railway Network) has been undertaking for several years an intense activity of maintenance and renewal of the heritage and strategic infrastructure. ETS has been in charge of the survey and the design for the renewal of Galleria Olmata (Olmata Tunnel), part of the Scandinavian-Mediterranean Corridor which represents the north-south axis of the...
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Analysis on Floating Mechanism of Shield Tunnel in Liquefied Foundation using Shaking Table Test
Abstract: With the increase of metro lines in large cities, the problem that a shield tunnel must cross liquefied foundation may arise. Once earthquake occurs, the shield tunnel faces the potential risk of floating damage. Several shaking table tests were carried out to study the seismic response of liquefied strata around shield tunnel under three different peak accelerations. The developing...
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Progress in Small Diameter Tunnelling: Challenges and Technology
Abstract: Small diameter tunnels are constructed for a large variety of applications. As safety aspects in mechanized tunnelling have gained more and more importance during the recent years, unmanned procedures like pipe jacking have taken over in the smaller diameters. It is nowadays a complementary tunnelling method in the diameter range of up to four meters, formerly covered by segmental lining TBMs....
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Streamlined Stormwater Conveyance Tunnel Planning and Design for Flood Control in Central Copenhagen
Abstract: Extreme rainfall in central Copenhagen, Denmark during 2011 caused extensive flooding throughout the city. In response, the city has embarked on ambitious improvements to provide flood protection and resilience. The scheme relies on new stormwater transfer facilities through high capacity conveyance tunnels. The Kalvebod Brygge (KAL) tunnel is a key element; a 1.2km tunnel to convey stormwater...
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Tunnelling and Underground Metro Stations in the Ground Condition of Kathmandu Valley, Nepal
Abstract: This paper presents a proposal of an underground metro rail network for the densely populated central part of the Kathmandu valley. Four underground metro rail routes and nine major underground stations are proposed for the urban core area to facilitate the urban mobility. The ground conditions within the valley are complex due to the nature of its lacustrine depositions, with water-bearing...
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Experimental Approach to Testing the Vibration on Excavation Machines
Abstract: In this paper, the ratio of peak to mean forces, which lead to better understand the vibration of a cutting head and the breakdown of the mechanical parts of machines, was analyzed. For this purpose, experiments using conical picks were conducted on sandstone rocks and the tool forces were monitored. Simplified comparisons among the ratios of forces, which are the ratio of peak cutting force to...
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