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World Tunnelling Congress
WTCThere are 1984 documents.
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Numerical Study of Waterproofing Membrane Considering Contact Behavior
Abstract: An waterproofing membrane has a relatively higher initial strength, faster construction time and higher waterproofing performance than the conventional sprayed concrete linings. Waterproofing membrane mainly consists of polymers and its supporting potential is from the adhesion at the interface and tensile strength which is distinct from the conventional method such as the shotcrete. However,...
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Effectiveness of Foam Injection during Mechanized Excavation of Tunnels with TBM-EPB Technology
Abstract: In the mechanized excavation of tunnels with Tunnel Boring Machines, an ever more frequently used technique worldwide is the Earth Pressure Balance (EPB) technology; during the excavation phases this technology requires continuous injection of chemicals under the form of foam to be mixed with the excavated soil.Since the features of the foam influence significantly the excavation performances...
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Design of Precast Segmental Tunnel Primary Lining for Tideway Central Contract
Abstract: Tideway project is a 25km long combined sewage storage and transfer system along the River Thames in Central London, UK. The project has been split into three design and build contracts with the limits of each contract determined primarily by geology along the alignment. The Contract for the Central section, the biggest and most challenging one of the three, consists of 12.7km of tunnel and 8...
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A new method for structural health evaluation of shield tunnel
Abstract: This study presents a new method for evaluating structural health with shield tunnels. As a fuzzy system, evaluation of tunnel health has the characteristics of randomness and fuzziness. Traditional tunnel health evaluation methodologies do not account for the fuzziness and randomness of the system. Therefore, using cloud theory, this study puts forward a new the method for evaluating tunnel...
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A Comparative Study on Shield Tunnels with Different Cross - Section Forms
Abstract: Compared with circular tunnels, the space utilization of rectangular tunnels is more efficient, with a bigger usable tunnel face and a smaller minimum buried depth, resulting in lower project demolition cost. In the past 30 years, with advanced technology, and the necessity of higher utilization of precious underground resource, tunnel engineers have paid more attention to rectangle mechanized...
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3D FEM Design of the Technical Chamber of the Hlavka Bridge Collector in Prague
Abstract: The construction of utility tunnels network in Prague started in 1969 and it is enlarged by Hlávkův Bridge Collector now. This utility tunnel connects the already existing collector lines both on the left bank and right bank of the Vltava river and it makes permanent relocations of all utility networks installed on the Hlávka Bridge possible. The project of Hlávkův Bridge utility tunnel...
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Monitoring the San Mamés tunnel, a NATM tunnel in an urban area: lessons learned
Abstract: The San Mamés tunnel was excavated in Bilbao (Bizkaia, the Basque Country), to improve the traffic management of the Spanish A8 motorway - named Autovia del Cantabrico- the main road in Northern Spain. The tunnel is placed under the city’s neighbourhood of Altamira.This tunnel is about 0.5 Km long with an operational section of 59.2m2, while the excavated section is 99,93m2. The geotechnical...
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Risk reduction effect of the supportive protective system (SPS) at Tunnel - Part 2: Evaluation of Validity of the SPS
Abstract: The "Supportive Protective System (SPS)" was newly established to prevent human error and intentional unsafe behavior of workers at workplace of tunnel construction. The SPS is the system to control and prevent human error and intentional unsafe behavior from the mechanical side (hardware side) using appropriate Information and Communication Technology (ITC) combination. In the present study,...
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Research on a new device used to decrease excess pore water pressure of soil around shield tunnels
Abstract: Grouting is important for shield tunneling as grouting material fills the adverse gap between segments and the surrounding soil. Generally, high grouting pressure will lead to large segment stress. In order to reduce the stress and deformation of segment, extra soil is usually removed behind the segment through a prefabricated hole located in the middle of each segment. However, this method may...
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Importance of earthquake re sistant design of underground caverns/ tunnels
Abstract: Rock caverns and underground space are viable sources of land supply. Tunnelling are seen as an environmentally preferable means of providing infrastructures to densely populated urban areas as well as for long transportation infrastructures along with used for underground hydropower projects. The past history indicated that underground structures in general are less severely affected than the...
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Performance based design of tunnels built in cemented fine-grained stiff soils
Abstract: The analysis of tunnel excavations carried out in densely populated cities requires the use of tools that adequately model the soil behaviour, as well as different structures, geometries and construction processes, to estimate more accurately the settlements and deformations of the tunnel that could generate affectations in structures surrounding at the excavation. Modern tunnel design and...
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Mutual interaction between parallel tunnels inside a weak rock mass under high overburden: The Brenner Base Tunnel...
Abstract: During the excavation of the exploratory tunnel and the two cavities for the construction of the Brenner Base project through a particularly fault-ridden area, an intensive monitoring system was installed on the consolidation and support elements.This instrumentation measured the deformations of the excavated rock mass, the stresses induced by the excavation on the structures and the stress...
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Risk Management in Tunnelling – A Joint Approach of all Involved
Abstract: Risk management in tunnelling requires a joint approach of all parties involved in the project, the clients’ representatives, the designers and the contractors as well as the site supervision and the geological and geotechnical experts on site. Only a common approach and a joint goal of a safe and economical construction will lead to a successful and satisfying project completion. The paper...
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The Midra Shale / Rus Formation unconformity and the potential for groundwater inflow into deep excavations, Doha,...
Abstract: Throughout Qatar, there are several very large sinkholes which are identified in Sadiq and Nasir (2002). One of these sinkholes, the Musafir sinkhole, is a popular field trip destination out of Doha for most geologists in Qatar. This large sinkhole, founded in the Rus Formation, displays the regional erosional unconformity between the Midra Shale member of the Dammam formation and underlying...
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Comparison of Two Possible Alternatives for the Development of Subsurface of Historical Buildings: A Case Study in...
Abstract: The role of underground space in the development and urbanization of cities has been increasingly challenged in recent years, especially in urban areas where the surface-land is mostly occupied. This is due to factors such as the unexpected need to go underground in large-scales, the initial human settlements of the city and the fast development of infrastructure. Therefore engineers,...
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Dubai Bluewaters Island Tunnel - Overcoming Structural Fire Safety Challenges
Abstract: Fires in tunnel is a major hazard. Tunnel fires also cause major damage to the surrounding structures. Limited escape facilities and difficulties encountered by intervention forces in gaining access to the tunnel call for extensive safety arrangements, which must be complementary and mutually coordinated. It is usually assumed that because the structure is constructed using concrete that it is...
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