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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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Segmental concrete tunnel lining design for two 6.9 m EPB TBM machines
Abstract: Precast segmental linings for shield driven tunnels are designed as both initial ground support and final tunnel lining in modern projects. The parameters of tunnel lining such as dimensions, thickness and strength of materials are related not only to ground-lining interaction, but also to construction conditions. In current case, both conventional steel cage and steel fiber reinforcement were...
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Lessons Learned from the First NATM Tunnel in California, Devil’s Slide Tunnel
Abstract: The Devil’s Slide tunnel is located along the California coast between Pacifica and Montara, west of the San Francisco Bay in the USA in a region with steep and unstable geological formation. The twin tubes were constructed beneath San Pedro Mountain using the New Austrian Tunneling Method (NATM). Each tube is 9m wide x 6.8m high and 1300m long making it the longest highway tunnel in...
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Raising EPB Performance in Metro-Sized Machines
Abstract: Singapore is employing more than 29 earth pressure balance machines (EPBMs) to excavate a single 21 km metro line, Downtown Line 3. Moscow is adding 50 km of new metro line by 2016, 150 km by 2020. China will expand their metro lines tenfold by 2050 to more than 11,700 km. China’s plans for the next two years require 250 EPBMs. With such extensive global metro expansion plans, increasing EPBM...
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Dynamic analysis for a circular lined tunnel with an imperfectly bonded interface impacted by plane SH-waves
Abstract: The analytic solutions for the dynamic response of a circular lined tunnel with an imperfectly bonded interface subjected to plane SH-waves are presented in the paper. Wave function expansion method was used and the imperfect interface was modeled with a linear spring model. The case that the rock is harder than the liner and the case that the rock is softer than the liner were...
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Ryfast tunnel project: measurement control and navigation - a new innovative system which optimizes tunnel excavation
Abstract: Modern tunnelling is subject to numerous demands: Tunnelling companies must keep costs low, finish projects in less time and still keep up with the high quality and safety standards. As a result, there is less time for preparation, a need for a simplified transfer of planning data, flexible operational capability and the use of high-performance instruments....
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Digitization and Application Research of the Shield Tunnel lifecycle Information
Abstract: During the construction and maintenance of shield tunnels, different people need to investigate and research tunnel data in all perspectives and processes. First, on the basis of analyzing the shield tunnel data standardization and digitization, this paper proposes a shield tunnel lifecycle data model, which is extensible and basically covers all kinds of...
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Impacts of railway tunnels, a review of practice and trends
Abstract: The High Speed 2 (HS2) scheme in UK is envisaged to include more than 62km of its route in tunnels. In order to address public concern about the impacts of tunnelling, data have been collected on ground movements and ground-borne noise and vibrations. This paper describes a series of case studies of ground movements due to underground construction and ground-borne noise and vibration from a...
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The performance prediction of a TBM in a complex geology in Istanbul and the comparisons with actual values
Abstract: Uskudar-Umraniye–Cekmekoy-Sancaktepe metro line of 20 km having two tubes is recently commissioned to Doğuş Construction Company by Istanbul Metropolitan Municipality authorities. The geology is complex consisting of sandstone, arcosic sandstone mudstone, siltstone, shale, limestone, andesite, and quartzitic conglomerate. The geologic units are frequently cut by...
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Fuzzy Logic model for the estimation of the unconfined compressive strength of the Ituango gneiss
Abstract: Knowledge of the unconfined compressive strength of the rock is one of the key aspects for the comprehension of the rock mass behavior, which is requested for design tunnels and underground constructions. The fuzzy system proposed have as input variables basic characteristics of the rock, such as: degree of alteration, foliation and grain size, which are interrelated through membership...
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Surface Stabilization and Settlement Mitigation of EPBM Excavations for Prague Metro
Abstract: In November 2012 two EPBMs completed 4.8 km excavations of twin tunnels for Metro V.A. in Prague. Roadway instability observed during the EPBMs shallow excavations triggered geophysical and drilling exploration works of the roadway subsoil, and intensive monitoring of ground and sewers. The exploration results indicated that the fill under the roadway and the tramway contained voids and had to...
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In-situ measurements and back-analysis in Overconsolidated Clay and between structure and soil: Earth Pressure at rest
Abstract: The study is about the general genesis process of overconsolidated soils, as well as the effects of the overconsolidated ratio to structures. It will demonstrate the possible methods for the determination of the values of overconsolidated ratio and of earth pressure at rest; further, the processing of measurement results, through which the values of OCR (Overconsolidated ratio) and of λ (Earth...
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Rheological analysis of rock bursting
Abstract: The mechanism of rock burst had been investigated by many different approaches. This work focuses in the rheology of rock masses, especially in the role of their elastic parameters – Young’s modulus (E) and Poisson’s ratio (ν) – in the process of the building-up of elastic strain energy (W). Testing of the role of such parameters was carried out by means of analytical calculus and numerical...
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Determination of Fire Load on Tunnel Lining under Event of Light Rail Vehicle Fire at Eglinton-Scarborough Crosstown...
Abstract: This paper discusses the approach undertaken to determine design temperature of Precast Concrete Tunnel Lining (PCTL) under a major fire event. The tunnel is part of 11 km long bored twin tunnels for Eglinton-Scarborough Cross-town Twin Tunnels (ESC TT) project in Toronto. The fire loading was established through a study for Transit Expansion Department (TED). Computational Fluid Dynamics...
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Widening the “Montedomini” tunnel in the presence of traffic: the evolution of the “Nazzano” method
Abstract: Widening a motorway tunnel in the presence of traffic without resorting to alternative routes or reductions in the level of service was attempted for the first time in the world in the early 2000’s to widen the Nazzano Tunnel (A1 Motorway , near Rome). Completion of that project constituted without doubt a true milestone for tunnelling. It demonstrated the feasibility and efficiency of the...
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Study on the law of natural light effect on tunnel lighting
Abstract: In the tunnel lighting field, reasonable use of natural light, reduce energy consumption of artificial lighting is one of the effective ways to realize green lighting. Combine with the tunnel lighting engineering practice and base on different times and different depths road illumination measured in Yunnan Tengchong Lushan tunnel, drawn the chart of the road illumination and the tunnel depth,...
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Risk Analysis Applicable to Shield TBM Tunnels
Abstract: In this paper, the potential risk of undesirable events that may occur during tunnelling work with a Shield TBM method is discussed along with the general risk analysis that can systematically assess overall risk levels. Potential risks and typical scenarios pertaining to shield TBM tunnels have been investigated based on previous case histories and correspondence with experts. The relevant...
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