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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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Study on the Mechanism of Seismic Technology of Deep Soft Rock Circular Tunnels Subjected to Incident Plane P Waves
Abstract: Tunnel damage generally occurred in soft surrounding fracture zone and the study on the seismic technology of soft rock tunnel was important and essential which was invested by WANG(2009). Currently, grouting reinforcement is always used in weak rock tunnel as seismic measure. Since Pao and Mao (1973) firstly studied the dynamic stress concentration of circular lined cavity in elastic full...
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Stability analysis of damaged concrete jack lining in an urban cable tunnel
Abstract: In order to minimize environmental impact, semi-shield tunnelling method has been widely applied to construct tunnels for water and sewage, power cable and gas pipe in urban area. In this study, a power cable tunnel was excavated by a semi-shield machine in Suwon, Korea in 2013. Total length of the tunnel is 453 m and the diameter is 2.4 m. During jacking process, unexpected medium rock...
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Pile Foundation and Tunnel Interaction in Mechanized Shield Tunneling
Abstract: Tunneling operation in congested urban areas becomes more frequent as demand for further utiliz-ing underground spaces grows. In urban settings, it is not uncommon for tunnel designers to plan a tunnel route in close proximity to other structures to satisfy other competing objectives like rais-ing the alignment to reduce excavation volume. Setting the alignment close to existing structures...
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Effect of Exposure on Post-crack Performance of FRC for Tunnel Segments
Abstract: Fibre Reinforced Concrete (FRC) intended for tunnel segments is subject to many requirements during production, handling, installation, and service. Fibres are typically incorporated into this material in order to provide post-crack performance should stresses exceed the flexural-tensile capacity of the concrete matrix. The characteristic post-crack performance for a particular mix will change...
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Dewatering and infiltration behaviour of annular gap grouts
Abstract: In mechanized tunnelling with segment linings, the annular gap between segment and soil must be filled instantaneously with an adequate grouting mortar. Thus, two contradictory requirements are demanded on annular gap grouts: On the one hand optimal flow properties lasting for several hours and sufficient stability against segregation, on the other hand the rapid development of shear strength...
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Management of construction time and cost effectiveness by imple mentation of the DAT software through the NeTTUN project
Abstract: The evaluation of the variability of the civil works duration and cost for the realisation of a tunnel is a determinant factor in choosing the optimal project planning and configuration alternative. The design, construction and operation of tunnels is associated with risks due to a lack of geotechnical information, the severity of a wrong construction choice, and the consequences that an...
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Advances on the design of SFRC subjected to concentrated loads
Abstract: The advance of a TBM during the excavation process is guaranteed by means of the thrust of the jacks over the last placed ring, which acts as a reaction frame. These loads generate bursting stresses that might crack the precast segments during this phase. In this regard, the width of these cracks usually reduces once the soil pressure is applied; however, sometimes these cracks can lead to the...
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On the use of macro synthetic fibres in precast tunnel segments
Abstract: The effectiveness of tunnel segments reinforced with 12 kg/m polymeric macro-fibres in addition to a minimum steel reinforcement ratio has been assessed. Precast tunnel segments have been adopted to test this fibre-reinforced solutions for structural elements, in which the longitudinal reinforcement has been designed to comply only with EC2 minimum reinforcement requirements for no seismic...
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Construction Project for the Rainfall Collector in Pinos Sub-basin, Madrid, Spain
Abstract: The construction of the stormwater spillover sewage tunnel of the Pinos Sub-basin is part of the stormwater management plan launched by the Madrid City Council in order to meet requirements imposed for the spills on the Manzanares river (Madrid City river). Infrastructure was designed to improve quality of the spills on the above cited river and the capacity of the existing pipe sewer as well...
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Numerical Analysis of PSTM (Pressurizing Support Tunnelling Method) using Reinforced Steel Beam for obtaining...
Abstract: With the expansion of infrastructure such as railroad and expressway network, in recent years, the application of the trenchless tunnel method to cross under road is increasing. In this regard, various trenchless methods have been developed by using different roof structures, each of which uses large stiff structure. These conventional trenchless methods have some features in common as follows;...
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Extreme Excavation in Fault Zones and Squeezing Ground at the Kargi HEPP in Turkey
Abstract: Multiple fault zones and squeezing ground requiring extensive bypass tunneling were just a few of the challenges to be overcome to successfully complete Turkey’s Kargı Kızılırmak Hydroelectric Project. Launched into poor geology in 2012, the 10 m Double Shield TBM experienced delays to the project that forced team members to find innovative solutions that included major in-tunnel modifications...
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Tunnel Monitoring During the Excavation Phase and Cost Optimization - a Case Study of Hakim Tunnel
Abstract: Although with the expansion of the urbanization dimensions of urban transportation have extended, it has not been able to meet the traffic needs of people in cities. This issue has been more pronounced in medium and large cities around the world and using public transportation systems to move people seems imperative to the extent that finding a solution for mass transportation expansion is...
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The possibility of Infrared Camera Thermography for assessing the real time stability of underground excavations
Abstract: Rockbursts under high stress environment and rockfalls in discontinuous rock mass are of prime concerns during underground excavations. One of the authors [1,2] and his group performed a series of tests on minerals and rocks ranging from soft to hard, which showed distinct heat releases before the rupture. This fact implies that infrared camera thermography should be of some value for assessing...
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Soil abrasiveness for EPB-TBM along Tehran metro tunnel line 7, Iran
Abstract: Full-face shielded tunnel boring machines (TBM) including earth pressure balance (EPB) shields have been used almost exclusively for soft ground tunneling because of the many advantages the offer in comparison to the conventional methods. The total number of EPB-TBMs that were utilized for tunneling between 2005 and 2010 is approximately 350 units worldwide as reported by [1]. These machines...
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The Influence of Metro Stations on Tall Buildings Settlement
Abstract: The studied metro station is Piaţa Iancului Station part of the newly designed Bucharest Metro Line 5. Its location is situated under the Iancului Drive, near its crossing with Mihai Bravu Drive (see Fig. 1). The station's location presents a series of impediments which needs an in-creased attention, such as: -presence of a series of tall buildings (10 to 14 storeys, with 1 storey basement)...
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Disc Cutter Load Monitoring System - DCLM
Abstract: The DRAGON project (Development of Resource-efficient and Advanced Underground Technologies) is intended to improve resource efficiency in tunnelling processes by providing the excavated material as a raw material. The physical characterisation of excavated material can be detected by measuring the disc force. Entacher (2013) has shown that geological conditions in front of the cutterhead can...
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