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World Tunnelling Congress
WTCThere are 1984 documents.
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State of the art design, construction and documentation methods in infrastructure projects
Abstract: More and more projects are using BIM models. Some projects require 4D (integration of time dependencies) and 5D (integration of time and cost dependencies) or even more. In addition objects shall be allocated with unique ID codes (tags) already in the design phase and object specific information is collected in database systems, which are linked to all documents (reports, drawings, datasheets,...
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SCL Design Optimisation at Bank - A combined lining approach
Abstract: London Underground and the contractor Dragados were looking for a solution that offered efficient use of space and resources, therefore a combined lining system, comprising primary and secondary fibre reinforced sprayed concrete linings was adopted. The paper will highlight the design considerations for different components of the combined lining, including special load cases that are critical...
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MiniBars(TM) – A non-corroding macro mineral fiber for rock support
Abstract: ReforceTech has developed a macro fiber type, MiniBars™, made of Alkaline Resistant-Glass or Basalt, as a durable alternative for shotcrete in tunnels. By use of MiniBars, the material use can be reduced, and thereby the CO footprint will be reduced. MiniBars has no electrical conductivity, has a density close to concrete (2100 kg/m3) and mixes easily into the concrete in sufficient large...
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Site specific seismic study of Tupul-Imphal railway line in Manipur, India
Abstract: The present study is focused on the site specific seismic study of the ongoing Tupul-Imphal Railway Line in Manipur which includes the Tunnel No 12 of the Tupul - Imphal section with an estimated length of 11.55 km. The proposed railway line is few kilometers only from the epicenter of the January 3, 2016 Mw6.7 earthquake, resulting from strike slip faulting in the complex plate boundary, thus...
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Aerodynamic Sizing of High Speed Train Tunnels – The Saverne Tunnel Case
Abstract: Aerodynamic sizing of a high-speed train tunnel is a critical design point as it conditions the choice of the tunnel cross section and therefore strongly impacts the project costs and planning. This article contributes to a better understanding of this subject by describing the aerodynamic studies and tests conducted for the Saverne tunnel (double tubes, 4 km long) lying on the LGV East High...
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Influence of stiffness of back-fill grouting material for void above tunnel lining upon load-bearing capacity of...
Abstract: Void above a tunnel lining is harmful to a tunnel structure in some cases especially in poor ground conditions. The void often exists in old tunnels constructed with the steel rib and lagging method, and back-fill grouting is one of the most effective countermeasures against the void. Stiffness of the back-fill grouting material is an important factor and should be examined appropriately to...
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Real-time prediction during TBM advance
Abstract: The Bore Tunnelling Electrical Ahead Monitoring (BEAM) system has been installed in all the 6 TBMs utilized in the excavation of the Gold Line metro of Doha (Qatar). The intent was to get a continuous real-time geological forecast ahead of TBMs, useful to predict the quality of the groundmass and the presence of large quantities of water. The article describes how the system was set up,...
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Design and Construction of Various Underground Components of CSO Systems
Abstract: Many major cities in the United States have a combined storm water and sanitary sewer network. Regular rainfall overwhelms the system capacity and results in millions of cubic meters of untreated sewage being dumped into local waterways. One legally mandated solution includes several kilometers of large diameter shallow or deep rock or soil tunnels, a pump station as well as associated...
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Rock Bolts as Permanent Support
Abstract: This paper describes the development of the CT-bolt®. Looking into the history of rock support and the different types of rock support. The CT-Bolt® was developed in 1994 to meet the requirements of Public Road Authorities. The bolt is designed to last up to 100 years in highly corrosive environments and is the last global innovation of rock bolts.
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A new concept for seismic mitigation method in immersion joint
Abstract: Under earthquake loading, the immersion joint, regarded as both weak and vital part as well as the sensitive part to deformation in immersed tunnels, could be likely damaged and no solutions about earthquake reduction of it can be found so far. With the rapid development of ultralong immersed tunnels, i.e. the Hong Kong Zhuhai Macao link immersed tunnel, this problem needs to be paid increasing...
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Tunneling Alternatives below Syracuse, New York
Abstract: The I-81 viaduct through the City of Syracuse, New York was constructed in 1960s. Portions of the I-81 viaduct structure are nearing the end of their lifespan. The New York State Department of Transportation is planning for future I-81. Tunneling and underground solutions are among the alternatives under consideration. One shallow and two deep tunnel alternatives were investigated. The shallow...
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Effect of the face support pressure on tunnelling-induced ground movement
Abstract: This paper studies the influence of the tunnel face support on tunnelling-induced ground movements via numerical methods. An advanced 3D FEM numerical model is used which realistically simulates the main characteristics of an EPB tunnel excavation procedure (i.e., the steering gap between the shield and the surrounding soil, the segmental lining, grout pressure and its consolidation...
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Study on short and long term effects of chemicals on fine grained soils for mechanized tunnelling conditioning
Abstract: This study presents the preliminary results of research activity focused on the physical and mechanical properties of soil treated with the injection of chemicals, commonly used in tunnelling performed with tunnel boring machines (TBMs) and EPB technology. For fine grained soils, the focus is to enhance the excavation process, optimizing consistency as well as reducing adhesiveness and...
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Control of operational and technical aspects of grouting works in tunnelling and heavy construction
Abstract: Grouting works have become a key essential part of temporary and permanent works in the fields of tunnelling and complex demanding construction projects, mainly in the forefront of construction to sufficiently prepare weak ground to meet the prerequisites for construction. Grouting measures are hereby often carried out as a specific measure with the emphasis to increase the bearing capacity...
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Mass transfer modelling of hydrogen sulphide (H2S) generated in London Tideway Tunnels (LTT): A new methodology for...
Abstract: The LTT aims to capture flows from combined sewer overflows (CSOs) which presently discharge combined sewage over 50 times in a typical year into the tidal Thames. When the LTT fills, the displaced air is treated and exhausted via ventilation stacks located at the shafts to the tunnels. The incoming sewage contains sulphides, which is transferred from the liquid to the gas phase generating H2S...
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Importance of face pressure and tail void grouting on numerical modeling of shield TBM tunneling through soft ground...
Abstract: Shield tunneling is now becoming a general trend in tunnel excavation. Despite the growing importance of shield tunneling, a prevalent standard for its numerical analysis has not been established yet, due to difficulty in appropriate implementation of face pressure, tail void grouting, and continuous excavation steps during shield TBM tunneling. Since there are various empirical methods to...
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