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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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The influence of scale and loading rate on the crack damage thresholds of Cobourg limestone with respect to Deep...
Abstract: A study is ongoing in preparation for site selection analysis of future high level nuclear waste Deep Geological Repository (DGR) development in Canada. As part of this work, the effects of specimen scale and loading rate, in combination with saturation condition, have been investigated for the geomechanical properties of Cobourg limestone. The results show that there is no significant...
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Evaluation and analysis of laboratory tests of bolt-anchored, steel-fibre-reinforced shotcrete linings
Abstract: Results from laboratory tests on statically loaded bolt-anchored, steel-fibre-reinforced shotcrete linings in interaction with rock are here evaluated using a 2D finite element model. Calculations are made to determine the state of stress in the rock-shotcrete interface near the rock joints. Plane-stress elements are used with a non-linear material model, capable of describing cracking and...
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Implementing contractors' know-how in early construction project phases – finding a way for the Austrian tunnel...
Abstract: This paper studies possibilities of early contractor involvement and its potential for op-timizing the project management of tunnel constructions in the Austrian tunnel industry. Considering the life cycle of a construction project, it is obvious that the highest potential for optimization lies within early project phases. It is therefore necessary to investigate the possibilities of...
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Separation of used bentonite suspensions in slurry shield tunneling: improvement of depositing costs by introduction...
Abstract: High costs and ecological impacts of separation and disposal of used bentonite suspen-sions are driving forces of the operating efficiency of slurry shield tunneling. This paper introduces a new method for improvement of the conventional separation processes by means of electrocoagulation. This method is based on the physical principles of electrolysis and consists of applying electrical...
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New Bologna Centrale High Speed Railway Station Monitoring project- technology at the service of safety
Abstract: The Bologna Central Station, is one of the new stations on the Milan-Naples high speed railway line and it is located in the center of the city. The station has been developed mostly underground, on three levels. The excavation covered an area approximately 630m long and 41m wide, with an excavation depth of 25m.The particular characteristics of the underground structure and its location,...
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Predicting stand-up time of the tunnel face using 3D numerical simulations
Abstract: The advance rate and the standstill time of a TBM have a large influence on the face stability of tunnels driven below the water table. In soils of medium-to-low permeability, the timedependent development of seepage forces directed towards the face is often the main reason for collapse. In tunneling practice, mechanized or conventional, the assessment of the „stand-up time“, i.e. the time over...
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Structure-borne sound from tunnelling works – measurements and predictions
Abstract: Preliminary noise studies for the Follo Line Project in Norway, consisting of two 20 km train tunnels, was based on a prediction model developed by processing measurement results from Norway, Sweden and Switzerland. As the tunnel boring machines (TBMs) for the Follo Line Project started out in an area with no dwellings in the immediate vicinity of the tunnels, this is an opportunity to modify...
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Benefits of Detailed Recordkeeping
Abstract: Maintaining detailed records of incidents, injuries, and near-misses can prove to be extremely valuable not only for the current project, but in bidding future projects. When coupled with hazard analysis and injury management protocol and records, processes can be streamlined with ongoing improvement. Record management can be effectively achieved by implementing electronic forms that...
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Full scale testing of rebar and SFRC segmental lining using independent and wireless instrumentation systems
Abstract: Development and acceptance of steel fibre reinforced concrete (SFRC) segmental tunnel lining requires an accurate understanding of the performance of the SFRC segments under real load conditions. An innovative instrumentation scheme has been implemented during the construction of the Liantang Lung Shan highway tunnels in Hong Kong to evaluate the distribution of the loads in the segments during...
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A Design Framework for TBM Face Equilibrium in Permeable Ground
Abstract: support pressure is an abstract representation of the combined effects of partial excavation, ground reinforcement, and the different support elements. The use of closed-face tunnel boring machines (TBM) changed this perspective, as the magnitude of pressures acting on the excavation boundary could be controlled in a more direct way. The pressures stabilize the tunnel face while in front of the...
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Assessment of design parameters for TBM tunnelling in weak and water-bearing ground and through fault zones
Abstract: The correct evaluation of the most pertinent geomechanical parameters assumes increasing importance due to the current trend of today’s planned infrastructure projects for which owners and planners quite frequently plan tunnels with diameters larger than 13 meters to be excavated by universal tunnel boring machine. The risks associated for large to very large tunnel profiles are emphasized...
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Challenges for Tunneling in Downtown Los Angeles for the Regional Connector Project
Abstract: Soft ground tunneling for the Regional Connector transit project in downtown Los Angeles has many urban challenges including typical risk issues of damage to buildings and utilities, community disruption, and environmental impact. The actions to meet the challenges known at the time of tender and how they have been addressed at the start of tunnel construction are presented. Unique measures are...
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Effects of ground water pressure on the surrounding of cross passage openings through segmental concrete linings
Abstract: The main tunnels of the Follo Line Project will be built by shielded TBMs using a water tight segmental lining, while the most of the cross passages are foreseen to be drained. The segment ring and the collar, which supports the opening of the segmental lining, will constitute an undrained lining, but the ground water pressure in the rock mass around will be modified by the water flow towards...
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Realization of the Norðfjörður tunnel, Iceland
Abstract: This article summarizes project parameters and technical requirements of the Norðfjörður tunnel, located on the east cost of Iceland. Purpose of the project is to provide shorter and safer connection between the villages of Eskifjörður and Neskaupstaður (where a regional hospital is located) on the Route 92. Excavation of the tunnel was carried out by the Drill & Blast method; it passes through...
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Under-passing of Karoon River by EPB-TBM in Urban Environment - Ahwaz Metro Case Study from Iran
Abstract: Ahwaz Metro line 1 in Iran is currently under construction by two EBP TBMs. In the central part, the alignment crosses Karoon River next to urban environment, being the most critical part of the route. The paper describes alignment optimization to address the difficult ground conditions with deep alluvial deposits in the river bed, so that geological risks are reduced adequately at early design...
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Feasibility analysis for the use of fiber reinforced concrete precast segment in Nenskra hydraulic tunnels
Abstract: The construction of two hydraulic tunnels with a total length of 30 km is forecast in the Nenskra (Georgia) project. These tunnels will be mechanical excavated with a precast segmental lining. The possibility of using fiber reinforced concrete segment without any traditional reinforcement has been considered. In order to obtain suitable performance of the lining, a process was defined in order...
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