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World Tunnelling Congress
WTCThere are 1984 documents.
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Case Studies of TBM Launch and Relaunch Application of FE modelling
Abstract: Proper TBM launch has a vital role in successful completion of tunnelling projects. This paper reviews common design and construction considerations in different launch and relaunch cases based on experience in two urban tunnelling projects. First case study presents launching of an 1800 mm ID microtunnelling TBM in ground consisting of boulders and cobbles. Boulders caused deviation of the...
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CERN (HL-LHC) the construction experience for the underground works at Point 5
Abstract: High-Luminosity LHC (HL-LHC) is the new project aiming to upgrade the underground particle accelerator Large Hadron Collider (LHC), at Point 1 (ATLAS in Switzerland) and Point 5 (CMS in France). This paper describes the construction experience for the new underground works at Point 5, located near the existing LHC tunnel. From a geological point of view, the site lies in an area covered by...
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Challenges during Micro-tunnelling by Pipe-jacking methodology - A case study
Abstract: Micro-tunnelling is a trenchless technique which has several advantages in urban areas due to the compact design and modern equipment. It does however impose some challenges such as difficulties in case of MTBM breakdowns due to inadequate working space in small diameter tunnels and the need for unplanned rescue shaft excavations to carry out cutter-head repairs. In Qatar, Doha South Sewer...
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Challenges during shaft excavations in urban areas - A case study from Doha South
Abstract: Deep shaft excavation in urban areas can be challenging due to several factors such as adverse geological conditions, ground water pressure and existing utilities or backfilled trenches near the shaft. In Qatar, Doha South Sewer Infrastructure Project (DSSIP) and contract LIS-01 of ASHGHAL (Public Works Authority, Qatar) has been associated with the excavation of 171 shafts with diameters...
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Challenges and unforeseen events during successful
Abstract: The Copenhagen Cityringen Project has been awarded and managed by the Copenhagen Metro Team (CMT), a joint venture between the Italian companies Salini Impregilo, Tecnimont and Seli SpA. Since 2015 Salini Impregilo owns 100% of the joint venture shares. The 4 EPB TBMs involved in the Copenhagen Cityringen Project have successfully ended their 31-km twin tunnel excavation beneath the city...
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Challenges for NATM design of Grant Road Station in Mumbai Metro Line-3
Abstract: Grant Road underground station is being constructed at the core of densely inhabited part of Mumbai city with old and dilapidated buildings at surface. Because of space constraints, conventional cut & cover station is not possible. Therefore, for upline platform New Austrian Tunnelling Method (NATM) is proposed below buildings and for downline platform narrow cut-and-cover box is proposed below...
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Challenges in Underground Construction of XRL West Kowloon Terminus (2)
Abstract: The Hong Kong Section of the Guangzhou-Shenzhen-Hong Kong Express Rail Link (XRL) is a 26 km long underground railway which starts from the West Kowloon Terminus (WKT) and connects to the Mainland Section of XRL at Hong Kong / Shenzhen Border. It was funded by the Hong Kong Special Administrative Region (HKSAR) and managed by the Mass Transit Railway Corporation (MTRC). WKT is the underground...
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City Link Stockholm TBM D rivefrom Anneberg to Skanstull in Crystalline
Abstract: Greater Stockholm is one of Europe’s fastest growing regions. This stimulates the need to invest in projects to secure sustainable energy supply and to improve the quality of life and living comfort for Stockholm’s citizens. The Stockholm City Link project is one of these big individual projects that will help to meet this need. It consists of a 5m-diameter cable tunnel that runs about 14km...
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Cityringen Copenhagen complex building protection for tunnellingin soft ground
Abstract: The existing metro system in Copenhagen has been expanded since 2011. A new 15.5 km long metro ring called "Cityringen" was constructed. At the new crossing station Kongens Nytorv, the tunnel passes above the existing tunnel and crosses under existing foundation with extremely short distance. After detailed risk analysis two main mitigation measures for the existing buildings were defined using...
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Classification of surface settlement of stacked twin tunnels by machine-learning
Abstract: To ensure the safe operation of tunnel boring machines (TBMs) in urban areas, surface settlements should be monitored at several levels such as the alert, action, and alarm level, to prevent any damage to nearby infrastructures. In this study, the random forest (RF) machine learning model was implemented to predict the surface settlement levels using a database collected from a Hong Kong subway...
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Clogging and flow assessment tests with cohesive soils from Singapore
Abstract: Understanding the geological-geotechnical characteristics of the excavated soil are essential for soft ground excavation with EPB machines, and this characterisation should include the resulting mixture as well, called the muck, after the addition of soil conditioners (e.g. water, foam, polymers). The EPB shield relies on the properties of this muck to maintain face stability. Muck...
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Combination of Artificial Neural Networks and FLAC3D for Predicting Tunnel Support
Abstract: Selection of diversion tunnel support system in dam projects is a very important factor affecting the safety and operation cost and can be estimated via several methods. In this study, one model whose data such as geomechanical parameters of rocks and tunnel geometry are obtained for diversion tunnel in Pirtaghi dam in Iran, is provided to estimate the axial force and bending moment of support...
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Combining Road and Railway Safety for the Largest Tunnel Project in Norway
Abstract: ABSTRACT: A common road and railway tunnel system was developed through a risk-based design approach for a new road and railway line on the western part of Norway. Road and railway tunnels with cross passages for evacuation and combined technical rooms provide a safe system eliminating the need for parallel evacuation tunnels and provide improved maintenance access for the railway and common...
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Comparison of Various Line Layouts of Submerged Floating Tunnel UsingFEM
Abstract: Submerged floating tunnel is still a conceptual stage but a strong research interest has been developing in recent years. Various types of line arrangements are conceptually available for tethered mooring of submerged floating tunnel. This paper quantitatively studied 6 different mooring layouts and discussed their advantages and disadvantages from finite element modelling. A 1 km long...
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Composite shell lining design analytical study of interface
Abstract: Traditionally, no bond has been assumed across waterproof membranes installed between primary and secondary tunnel linings. Spray-applied membranes offer the opportunity to consider some bond between the two linings, producing a composite action. The composite action has been verified through a significant laboratory testing programme from research from Pillai et.al. (2017)1 and an analytical...
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Concept Design of Sadar Bazar Underg round MRTS Station in Congested Area, Delhi
Abstract: Delhi Metro is a Mass Rapid Transit System of the capital of India and one of the busiest metro lines in the world. Sadar Bazar station is one underground station proposed in Phase IV located in a very congested marketplace, with buildings constructed more than 100years ago. The geotechnical profile consists of sandy silt upto 5m depth followed by weathered rock underneath. The station was...
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