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Papers from WTC and ITA conferences have been made available as PDF documents.
ProceedingsThere are 1984 documents.
List of endorsed conferences
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WTC
World Tunnelling Congress
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On the Tunnelling in Slate Formation in Taiwan
Abstract: In the Wanta-Sunglin hydropower project of Taiwan Power Company, a 5,947m-long tunnel passing through metamorphic slate formations was constructed by NATM method. Before the breakthrough of this tunnel in 2011, due to the variation of geological conditions, the excavation was blocked by shear zones with squeezing and creeping effects, until remedial measures and supporting adjustment were...
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Geotechnical Risk Management for Sprayed Concrete Lining Tunnels in Farringdon Crossrail Station
Abstract: The proposed Crossrail station will comprise two ticket halls, two escalator/concourse tunnels, two platform tunnels, numerous cross passages and ventilation tunnels. All station tunnels are constructed using sprayed concrete lining (SCL) techniques. The geological conditions were the principal challenge for the design and construction of the Farringdon station tunnels, excavated mainly within...
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Pile Tunnel Interaction: Literature Review and Data Analysis
Abstract: The underground space of densely populated cities contains deep foundations and tunnels. Considering the possibility that a new tunnel can be built close to existing piles it is necessary to assess the possible effects of that interaction. Most case studies have shown limited damage on pile supported structures; however, these constructions deal with great uncertainty as the mechanism of pile...
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Influence about the stiffness ratio of the double-shell lining to the dynamic response of tunnel structure under...
Abstract: This paper mainly focused on analyzing the influence of relative stiffness ratio to the dynamic response of tunnel structure. The relative stiffness ratio is the one between primary support and secondary lining. The numerical model of a two-line highway tunnel with variable stiffness ratio is obtained by applying ABAQUS. By analyzing the relative displacement, the maximum principle stress and...
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Tunnel Safety Design Brazilian Standardization
Abstract: Incidents in road tunnels turned up lately to improve safety design and standardsworldwide. In Brazil, the ABNT (Brazilian Association to Technical Standards) is a private nonprofitable association that has joined ISO. ABNT BR Committee for Fire Protection (CB 24) hasstarted preparing standards on tunnel safety design in 2000. There are four standards published. Theydeal with fire protection...
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The Role of Operational Factors on Water Inflow to Unlined Rock Caverns
Abstract: Widely utilization of large unlined rock caverns (URCs) located in water-bearing rock formations for hydrocarbon storage calls for more stringent hydrogeological precautions. Prediction of water inflow to the unlined caverns is one of such critical components faced by designers and hydrogeologist. Successful predictions of such issues require a thorough understanding of the physical processes...
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A simple precaution for preventing of the lining failures in the tunnelling by the shielded TBMs through squeezing...
Abstract: The use of shield around the TBM allows the machine to pass through weak grounds and adverse geological conditions. However, using the shielded machine limits access to the walls for observation of ground conditions and presence of shield makes the machine susceptible to entrapment or seizure in weak rocks under high stresses which results in high convergence. On the other hand, failure of the...
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Gap Parameter and Settlement by Shield TBM Tunnelling
Abstract: Utilization of Underground Space has gradually expanded according to population density increases. Size of Tunnel has enlarge in accordance with the use. In order to increase civil convenience in traffic and life Shield TBM tunnelling method has been getting the spotlight for urban tunneling. It can be minimized the civil complaint during construction and possible safe tunneling. But the...
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OPTV application in the Line 4 Phase 3 design at São Paulo Subway
Abstract: The optical televiewer (OPTV) is a technology introduced since 2001 in Brazil, having its considerations about this method been included only recently in the ABGE Drilling Manual (2013), without, however, presenting detailed specifications of a systematic interpretation of the data. On the other hand there was a lack of suggestions of how these data could be applied for infrastructure site...
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Numerical Analysis on Settlement Behavior of Shallow Box Tunnel Widening
Abstract: Utility tunnels jointly accommodate various infrastructure such as electric and communication lines, gas, water and sewage pipes in the ground, so the aesthetics of urban areas are improved and traffic flows can be well maintained. In Korea, Utility tunnels was first installed in 1978 to supply electric power, water and heating in Seoul. After several repairs, they are still being used. But...
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Managing Residual Risk – a Case Study
Abstract: Accidents, time- and cost overruns at tunnel projects are rather common. The reasons are manifold, reaching from inadequate investigation, over outdated and oversimplified design practices to neglecting the importance of managing residual risks during construction. If risk analyses are conducted at all, in many cases they are seen as separate task after completion of the design. Thus...
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Full-scale tests on precast tunnel segments in fiber reinforced concrete
Abstract: The use of Fiber Reinforced Concrete in precast tunnel segments is continuously increasing. The possibility of totally substituting the ordinary steel cage with a fiber reinforcement allows several advantages related to higher quality and reduced costs. Several researches were developed on the field [1-5], showing the feasibility of this solution. A particular attention was paid on enhancing...
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Study of solutions for realization of portals in difficult grounds
Abstract: The first part of the paper is an overview on the technical and architectural aspects of tunnel portals design with a comparison of different solutions, from point of view of materials and technologies used and of their evolution in time. The second and main part of the paper is dedicated to the study of the new solutions used for realization of railway tunnel portals in difficult and unstable...
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Design and construction aspects of a conventional shallow tunnel in very soft soil
Abstract: The Metro Line 5 Expansion is currently in progress in São Paulo/Brazil. It is a project that will connect the South area of the city to the city centre. There are 11 km of tunnels and 11 new stations under construction, including connections to the existent Line 1 Santa Cruz Station and Line 2 Klabin Station. Brooklin Station, part of the expansion, is located in a highly occupied area in São...
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An automated and rapid measuring method for cross-section deformation of shield tunnels
Abstract: Due to the high cost and continuously aging deterioration, the inspection and maintenance of structures have become increasingly important in the tunneling field over the past decades [1]. Shield tunnel consists of precast concrete segments that form rings by the connection of steel bolts. Unlike tunnel constructed by cast-on-site concrete linings, the rigidity of shield tunnel is relatively...
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Planning and Designing the Izmir Bay Crossing and Connections
Abstract: İzmir is the third largest city of Turkey and one of the most important commercial, industrial and touristic centres of the country. Having the second most important seaport of Turkey and a population of about 4 million, İzmir has become one of the fastest growing cities of the country along with its demand for transportation facilities. Within the context of ‘İzmir Bay Crossing and Connections...
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