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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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Innovative traffic barrier for road and city tunnels
Abstract: This paper presents a project of an innovative, safe and effective traffic closure system for road and city tunnels. This system, based on a net of flexible silicon components and carbon strings which forms together a “roller shutter”, should solve a problematic closure of a tunnel during emergency and maintenance situations. Every traffic lane has its own independently operated barrier. The...
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M6 Metro Line Extension in Bucharest, Romania
Abstract: The population of Bucharest City Metropolitan Area is currently exceeding 2,1 million. The first step in the preparation of Bucharest Metro Transport Global Development was to identify the methods of increasing the share of Bucharest metro transport system and its performance under the specific circumstances generated by urban public transport. The M6 metro line will connect Bucharest City with...
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Pre-investigations for TBM tunnelling
Abstract: Tunnelling with tunnel boring machines (TBM) has become the selected excavation method for some infrastructure and hydropower projects in Norway the last years. Planning and preinvestigation of ground conditions is known to be costlier and more demandable for TBM tunnelling than for conventional drill and blast (D&B) tunnelling, which is the most commonly used excavation method in Norway. This...
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New software for the design of urban tunnel with risk assessment
Abstract: On shallow tunneling, the assessment of risks in terms of surface settlements and tunnel face stability remains a huge challenge for engineers. In the aim to design conventional tunneling in an automatic sequenced process with risks analysis, a new 3D analysis software has been developed based on the finite element software CESAR-LCPC. This paper intends to present the features of the new...
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A DFN-LiDAR-optical sensor method for the estimation of rockmass conditions in underground projects
Abstract: A sound and economical underground project design depends on a realistic geological model, a quality rockmass characterization and an informed assessment of other influencing factors. However, due to the lack of truly three-dimensional subsurface fracture geometry data, this reality is rendered difficult. In order to overcome this, the use of Discrete Fracture Networks (DFNs) is becoming...
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Practical Relevance of Rheology of Foam-conditioned Sands in EPB Tunneling
Abstract: At the previous WTC 2016, the rheological characterization of soil-foam mixtures was presented by means of the slump test. Measurements from numerous slump tests were considered in analytical models enabling a derivation of rheological parameters. In this publication, the rheological analysis of soil-foam mixtures is extended to rheometer testing. By conducting experiments on different scales,...
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High Speed Railway Milan – Genoa, Parametric analysis of rock stress-strain control during tunnel excavation in the...
Abstract: The Stretch of the Italian high speed railway between Milan and Genoa is currently under construction and will be completed by 2021 with more than 85 km of tunnels. More than 60 % of the tunnel excavation will be realized in the “Argille a Palombini” formation (aP), characterized by an alternation of claystone schists with limestone lenses, highly tectonized and squeezing. The paper describes...
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The importance of prospection beyond the tunnel face: impacts on excavation speed and benefits
Abstract: In deep tunnels with high overburdens, geological predictions are usually not very reliable. The geological and hydrogeological risk of unexpected events caused by dangerous rock mass reactions remains high. Reducing such risks to a minimum during excavation is a must. For this reason, when excavating both with explosives and with a TBM, prospection measures beyond the rock face should be part...
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Effect of sample preparation and freezing temperature on constitutive modeling for frozen soil in subsea tunnel...
Abstract: When high water-pressure is expected during constructing cross passages in subsea bored tunnels, convectional grouting technologies are not appropriately adapted to water cut-off. In this extreme condition, the artificial ground freezing (AGF) technique can be a promising alternative for constructing cross passages through highly-fractured fault zones. An appropriate experiment procedure to...
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A comparison between empirical models and FDS simulation to predict the ceiling gas temperature distribution in a...
Abstract: A comparison between the results obtained from a Computational Fluid Dynamic (CFD) simulation and from the application of an empirical formula for determining the temperature distribution inside a tunnel in case of fire is presented. The temperature is measured and calculated at different distances from the location of the fire and at different time intervals. The fire considered varies with...
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Computer Aided Steel-Fiber Reinforced Segment Design Using a Multi-Scale Modeling Framework
Abstract: Loading assumptions used in segmental lining design often improperly reflect the complex load combinations that develop during the construction of a bored tunnel. Therefore, segment designs used in practice tend to be conservative and often rely on conventional reinforcement methods instead of including other reinforcement concepts, such as steel-fibers. In this contribution, a multi-scale...
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Selection of appropriate approach in geotechnical studies to accurately predict the ground settlement due to tunneling
Abstract: Ground settlement due to tunneling is highly dependent on geotechnical properties of host materials; So it is important to obtain precise and accurate knowledge of the properties. To perform most of laboratory tests, it is necessary to prepare undisturbed samples of soil that is difficult task in coarse-grained soil such as sands or gravels. To determine geotechnical parameters of such soils...
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Estimation of TBM performance due to the muck shape and size – A case study of Golab II water transfer tunnel
Abstract: Estimation of TBM performance and the interaction between design and operational characteristics of the machine and muck quality is a complex and nonlinear problem. A field study in a TBM driven tunnel was carried out to compile a database consisting of machine operational factors and muck shape and size parameters. Statistical analysis was used to investigate the correlation between these two...
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The Impact of Evolving Requirements for Fire Safety and Emergency Planning on the Configuration of Underground Metro...
Abstract: Once the demand and route for a Metro system is established, options for tunnel configuration are developed. Whilst civil and systems engineering requirements are project-specific, fire safety and emergency planning objectives remain relatively unchanging across projects. We present the regulatory context followed by case studies from recent projects, where fire safety was a key factor in...
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Predicting Roadheader Performance by using Portable Linear Cutting Machine
Abstract: Roadheaders are widely used in mining and tunneling industry. A portable linear cutting machine (PLCM) has been developed within a project supported by Scientific and Technological Research Council of Turkey (TUBITAK 112M859) for the performance prediction of mechanical excavators used in mining and tunneling applications. A field study was performed in Amasya Suluova Coal Mine owned by PLT...
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BIM-to-FEM: Incorporating Numerical Simulations into BIM Concepts with Application to Real Tunneling Projects
Abstract: Finite element (FE) simulations are an integral element of the planning and design process for mechanized tunneling projects. The models needed for these simulations are typically manually generated using 2D-CAD drawings, which is a laborious and time-consuming process. Recent trends incorporating Building Information Modeling (BIM) concepts offer opportunities to simplify this process by using...
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