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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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Effect of Adhesion on EPB TBM Performance
Abstract: Mixture of the excavated clay consisting soils and water sometimes generates a sticky muck, which adheres to the metal parts of TBMs such as cutting tools, cutterhead and transportation system causing blockages and stoppages in the job during excavation. This problem may lead to decreasing of advance rate and increasing of the project costs, since the excavation process could only be continued...
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Sydney Metro - Site Investigation and Ground Characterisation for the Sydney Harbour Crossing
Abstract: Sydney Metro is Australia’s largest public transport project, extending 65 km from the northwest of Sydney, under the iconic Sydney Harbour, through the CBD and then towards Bankstown to the west. The harbour crossing is a key element of Sydney Metro. Limited geotechnical information existed prior to the project. As such, detailed geophysical and geotechnical investigations to facilitate early...
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Cyclic Shear Behavior of Tunnel Lining-Soil Interface Considering Subsea Condition
Abstract: Tunnel is an appropriate solution to solve traffic problems in the metropolitan cities. The cyclic behavior of tunnel is difficult to predict since complicated response occurs at the tunnel lining interface under the seismic loads. The interface comprising between tunnel lining and soil is one of the main reasons that makes the dynamic shear behavior more complicated because it is discontinuous...
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Mechanical and rheological characteristics of the siliceous mudstone at the Horonobe Underground Research...
Abstract: The Horonobe Underground Research Laboratory (URL) in Hokkaido, Japan has been constructed in diatomaceous and siliceous mudstones, which are widespread in the areas along the Sea of Japan. It is essential to understand the mechanical and rheological characteristics of these rocks for the construction of underground structures and for the assessment of their long-term...
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The Challenge of Proving the Feasibility of a TBM drive in Weak Rocks at the Bossler Tunnel in Germany
Abstract: The 8.8 km long Bossler tunnel is a twin-tube railway tunnel near Stuttgart. A TBM drive was initially considered impossible in the centre section of the tunnel due to weak rock. Using the benefits of an intermediate access tunnel constructed in advance to the critical sections of the tunnel, a value engineering approach was developed which allowed a reassessment of the ground parameters...
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Evaluating the possibility of shield jamming in squeezing grounds
Abstract: Excavation of long and deep tunnels by shielded TBMs is a safe, fast, and efficient method of tunneling that mitigates many risks related to ground conditions. However, TBM applications in difficult conditions such as squeezing ground may lead to problems such as shield jamming. For successful tunneling in such conditions, it is essential to study the...
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Wear prediction for soft-ground tunneling tools – a new approach regarding the dominant influencing factors in...
Abstract: The performance of a TBM is strongly dependent on the wear of the cutting tools. Worn tools decrease the advance rates, thus leading to increased tunneling times and project costs. Wear prediction models are thus used during the planning phase of a tunneling project. The disadvantage of commonly used wear tests, which are necessary to generate input parameters for the wear prediction models, is...
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TBM performance prediction using PLCM and comparison with TBM field performance parameters
Abstract: Full Scale Linear Cutting Machine (FLCM) is a most popular rock cutting test device for prediction performance parameters of mechanical excavators. LCM test have some disadvantages that requires too much manpower, large blocks of rock samples, which are usually difficult, too expensive, or impossible to obtain. For these reasons a new portable linear rock cutting...
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The factors affecting the performance of three different TBMs in a complex geology in Istanbul
Abstract: Four hundred kilometers of metro tunnels are expected to be opened in Istanbul in the near future. The geology of Istanbul is complex changing frequently from very hard rock formation to soft ground in a short length. Mahmutbey-Mecidiyekoy metro tunnels, which are currently excavated by three different EPB-TBMs, gave the unique opportunity to investigate the effect of opening ratio and physical...
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A simple application of probabilistic concepts as an indicator of tunnel face instability in sequential tunnels by...
Abstract: Many of sequential tunnels constructed in urban areas passes through areas where influence of excavation produces negligible consequences on near buildings or infrastructures. Under these circumstances major attention is given to the ground conditioning through a face stability analysis and too few is given to the settlements that the excavation might produce. The following paper is presented...
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Visual impact and safety perception on users of urban tunnels: the role of the design
Abstract: The success of urban tunneling, for pedestrian and cycle paths, has to deal with the psychological impact on the users for the characteristic shape of the section of the structure. This is influenced by the visual aspect of the inner space of the crossing. Furthermore, the common perception of the safety in such structures is low, especially due to the restricted path, implying an effort in the...
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Growing demand for TBM technology to construct deep tunnel sewerage systems
Abstract: In 2008 the first Deep Tunnel Sewerage System (phase 1) was completed and implemented in Singapore. The concept of the DTSS involves deep tunnel sewers that convey waste water by gravity to centralized water treatment plants. The system is an efficient and cost efficient solution to meet long term needs for waste water collection, treatment and disposal. Seeing the demand today especially in...
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Metro Doha Green Line – Challenges delivering a world class urban tunnelling project
Abstract: As part of the “Qatar National Vision 2030” the capital of Qatar – Doha – is supposed to be transformed into a modern center for economy, trade and sports. A main item to achieve this is the establishment of an efficient infrastructure with modern means of transportation. The Design & Build – Project Green Line Underground has been awarded to a Joint Venture (JV) composed of PORR (lead),...
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Development and Application of Cableless Seismic Survey System in Mountain Tunnel
Abstract: A cableless seismic exploration system that can be used in the construction of mountain tunnels for quantitative rock condition evaluation near the tunnel face and investigation in front of the tunnel face was developed. The system requires no cable for the exploration and its simple system configuration achieves high-precision exploration in a tunnel construction...
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The great tunnel of the Apennines (Italy): a lesson from the past
Abstract: In the early XX century, a long base-tunnel (the Great Tunnel of the Apennines - GTA - 18.507 km long) was executed between Bologna and Firenze (Italy). During excavation, large water inrushes, methane inflows and swelling events occurred, with many injuries and casualties. In this paper, we present a re-visitation of the main geological concerns of the GTA in order to understand, at the light...
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Application of a Rapid Non-Core Drilling Exploration Ahead of the Tunnel Face using Water-Powered Hammer Drilling on...
Abstract: Generally speaking, in order to survey the geological conditions existing ahead of the face, tunnel excavation must be discontinued temporarily, and therefore it is necessary to bore over a long distance in as short a time as possible. To overcome these requirements, we have developed an exploration system with a water-powered hammer of down-the-hole drilling type, which is capable of surveying...
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