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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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A Risk Exposure Method of Tunnel Management for Expressways
Abstract: Expressway tunnel has aged routes of no less than 35 years old. With the ageing of these, deterioration and damage of their structures and facilities have become apparent. Expressway are the most important arterial roads in Japan, and therefore, maintenance of good service levels will continue to be required in the future. For tunnels, as shown in the figure and the table, there exist...
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Soil Conditioning for Shield Tunneling in Argillaceous Siltstone in Nanchang Metro Line 1, China
Abstract: Nanchang Metro Line 1, China was mainly excavated through argillaceous siltstone in some sections. Soil clogging happened in the early construction stage, and so deep investigation was carried out in another section of the metro line to avoid the soil clogging. Based on mineral-ogy investigation, the content of clay minerals is 40.5% in the argillaceous siltstone (kaoline 27.8%, illite 8.3%,...
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ITAtech design guidance for precast fibre rein-forced concrete segments
Abstract: The ITAtech Subactivity group on fibre reinforcement for precast concrete segments intends to publish its guideline at the end of 2015. This paper is intended to present the salient features of the guideline for what is an increasingly popular but at times poorly understood technology. Fibre reinforcement offers many advantages over traditional bar reinforcement of tunnel lining segments. Not...
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Longitudinal Rigidity of Shield Tunnels Based on Numerical Investigation
Abstract: In recent years, shield tunnelling method has been widely used in world’s underground transportation engineering due to its high mechanization and mature technology. However, according to past researches, slender structures as shield tunnels are particularly sensitive to differential settlement of foundation, which may lead to large opening of the segment joints and consequently complete...
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High-Speed Rail-Tunnel Aerodynamics - Advances and Issues
Abstract: The very rapid worldwide development of high-speed rail transportation focused attention on an entirely new set of aerodynamic issues, which were not relevant for conventional rail transportation. The most prominent are: Passenger health and comfort issues result from large pressure fluctuations generated in particular while entering tunnels and in case of trains crossing. Comfort issues arise...
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Large diameter EPB excavation with low overburden in St.Peterburg
Abstract: Line 5 of Saint Petersburg Metro, also known as Frunzensko-Primorskaya Line, connects the city's historical centre to the north western and southern area. The line is being extended from both ends since 2009. The line originally opened in December 2008. It contained only two stations until March 7, 2009, when the Line 4 (Pravoberezhnaya Line) segment between Komendantsky Prospekt to Sadovaya...
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The Influence of Layered Soil on Dynamic Analysis of Underground Structure
Abstract: Statistically speaking, underground structures experienced a lower rate of damage than surface structures. Nevertheless, in the wake of vast construction of underground facility, i.e. subways, underground emporiums and pipelines, some underground structures have experienced serious damage during recent large earthquakes. Consequently, varies of methods for seismic design and analysis of...
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DFN generation for Mechanical Stability Analysis of Underground Works
Abstract: A first step in the characterization of fractured rock materials and its anticipated mechanical response during an underground excavation is the static mapping and modelling of the subsurface fracture system. This task is rendered difficult by the lack of truly 3D data about the subsurface fracture geometry. Yet, it is critical to be able to establish a reliable, geologically and...
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Risk control in planning water conveyance tunnels
Abstract: Risk control experiences during the past decade in planning of numerous water conveyance tunnels, predominantly in TBM drives in South East Asia, with disappointing results have been analyzed as shown in the following 3 examples. Dulhasti HEP (Hydro Electric Project) in Jammu & Kashmir where tunnel strata encountered during TBM excavation was having Quartzite & intermittent bands of Phyllite....
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Reconstruction of the Rocsky Tunnel
Abstract: Rocsky motorway tunnel was built in 1986 with a purpose to provide the way through The Main Caucasian Ridge at the Rocsky nek between North and South Ossetia, on the 93 kilometer of the Transcaucasian highway 2000 m above sea level. Total length of the tunnel is 3730 m. There is a multifunctional adit with total length of 3805 m running parallel to the tunnel. During 2003-2007 a thorough survey...
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Risk Analysis in Tunnel Linkage of two cascade Hydro Electric Projects- 1500MW NJHPS (Nathpa Jhakri Hydro Power...
Abstract: The 1500 MW (6X250 MW), Nathpa Jhakri Hydro Power Station a run-off the river scheme presently largest in the country, is the first project commissioned by SJVN Limited . The main features of the project are a 62.5m high concrete dam , four desilting chambers each 525m long, 16.3m wide and 27.5m high, the head race tunnel (HRT) is 27.4km long and of 10.15 m diameter, surge shaft at the end of...
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Highway Crossing for Sheppard East LRT Project in Toronto
Abstract: Major rapid transit projects are planned to be built across the Greater Toronto and Hamilton Region in Canada. The plan is part of The Big Move (Metrolinx 2008) a 25-year, $50 billion plan that will improve regional transportation. Metrolinx, an agency of the Government of Ontario, is now working collaboratively across the region to deliver major Toronto rapid transit projects.
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Optimizing Soft Ground Excavation: Development and Design of EPB and Slurry Cutterheads
Abstract: The history and development of soft ground tunnelling machines is a long one, and one in which the quest for optimal design to achieve safe and efficient excavation has always been a top priority. Modern soft ground tunnelling began with the introduction of Slurry TBM technology in 1967 and the development of Earth Pressure Balance (EPB) machines a bit later in 1974 in Japan. Many advances have...
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Pipes arch method for a railway tunnel under highway A1
Abstract: The paper presents the design and research efforts made to successfully construct a rail tunnel which under crossing oblique (60˚) a highway with six-lane and with as little as 2,70 - 3.30m of cover. Geotechnical parameters, tunnelling method selection, construction phases and three-dimensional finite element analyses with ground response and monitoring are discussed. The selected method was...
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Influence of slurry TBM parameters on ground deformation
Abstract: Tunnelling in soft ground can induce considerable ground deformation that poses a risk to existing infrastructure. To control ground deformation, pressurized-face tunnel boring machines (TBMs) (e.g., slurry shield and earth pressure balance (EPB)) are increasingly employed in urban areas. The effect of support pressures applied at the tunnel face and circumference have an important influence on...
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Risk management: tunneling through major active fault zone by seismic prospecting method
Abstract: Tunneling through active fault zone is a high risk job and could have a big impact on the construction program. Hence it is essential to grasp the condition of the ground ahead of tunnel face beforehand so that early countermeasure can be planned and implemented. This paper includes a construction of 1.8km length of road tunnel called Shioteyama tunnel and will pass by a major active fault zone...
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