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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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Effects of paleo-rock landslide and heavy rainfalls to tunnel excavation
Abstract: On the contrary of man-made structures, technical descriptions of geologic structures are mostly strenuous tasks for geotechnical engineers. As necessity of its nature geological structures are not homogenous, chaotic. Geotechnical identification of weak and average quality rock masses is far harder when compared to identification of soils. In underground structures, too many uncontrollable...
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Probabilistic Estimation of Operating Pressure for TBM Tunnelling
Abstract: The problems posed by urban development and the challenges of traffic, utilities etc. are often solved by digging tunnels. More and more tunnels are being excavated and there are a host of new technologies to assist in excavation. Most urban tunnels are now shield driven. This increases the importance of controlling the tunnel face pressure during its advance. In the case of shallow tunnels,...
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Multiple regression analysis of the effects of the weight ratios of clay minerals and fine-grained soils on the...
Abstract: A given rock mass is likely to contain geological structures such as faults, joints, and foliations formed as a result of tectonic activity. Such geological structures represent anisotropy and heterogeneity within the rock mass and lower its strength, reducing the overall stability of the rock mass, and acting as a geological risk factor for tunnel or slope excavation. Heterogeneity in particle...
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Boundary Element Simulation of Tunneling Induced Pile Settlement
Abstract: Tunneling induced damage to adjacent structures is likely to delay construction schedule, increase construction cost, and generate negative community and political impacts. The increasing demand for urban tunneling in densely developed underground areas and the associated economic and political risks lead designers to seek tools for accurate predicts of tunneling induced damage to adjacent...
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Reconstruction of a heaved invert without closing expressway
Abstract: The Nikkureyama Tunnel is a two-lane traffic tunnel 2,000 m long, located on the Joshinetsu Expressway that extends from the Tokyo metropolitan area to Nagano. The section in the second phase was completed in 2002 by rerouting, maintaining the distance from the super-squeezing zone in the section of the first phase in order to avoid interference. However, eight years after the opening of...
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Twin tunnels excavated in sandy soils in a density urban area
Abstract: The Line 5 Extension is being the major government investment for the public transport in São Paulo/ Brazil. It will connect the São Paulo south area to its central area, with a whole extension of 11 kilometres, including 11 new stations. The first stretch consists of two single tunnels with 4 kilometres long each, which will be executed by two 6,86 m EPB Shields. The two machines will bore...
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Effect of Hydraulic Conditions in controlling the Face in EPB Exca vated Tunnels
Abstract: This paper investigates numerically face stability and deformation of EPB tunnels excavated below the groundwater table. Emphasis is given in the proper simulation of the pressure exerted by the excavated material filling the front chamber of the EBP machine. The paper presents the results of 3D coupled hydromechanical analyses for tunnel face stability, using the computer code ABAQUS with the...
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GFRP Pipe for Tunnel Face Reinforcement: The Laboratory Characterization
Abstract: In tunnelling engineering the preliminary support of the tunnel face is often based on the soil nailing technique, considered as one of the most effective provisions for the control and reduction of the tunnel pre-convergence and face extrusion. The nails are mostly made of Glass Fibre Reinforced Polymer (GFRP), due to the advantages this material offers in this application. In the years,...
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Lining Thickness Optimisation for Composite SCL Tunnels
Abstract: This paper presents a composite SCL tunnel secondary lining thickness optimisation study. It first introduces the numerical model that simulates the behaviour of an SCL tunnel and the modelling strategy for the composite action between the primary and secondary linings. It then reports the influence of variation in the secondary lining thickness on the sufficiency of lining and interface...
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Experimental investigation on the local splitting behavior under TBM hydraulic jacks
Abstract: The employment of Fiber Reinforced Concrete (FRC) in precast tunnel segments in combination or not with conventional rebars is rising in the two last decades [1]. Steel Fiber Reinforced Concrete (SFRC) is generally used, even though there is a growing interest in the scientific community on polypropylene (PP) fibers for use in structural applications. In fact, in the last decade, important...
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Case study: Flood mitigation of Bodø River, Northern Norway
Abstract: The municipality of Bodø, Northern Norway, and the Norwegian Road Authorities (SVV) is planning the construction of a new floodwater tunnel to regulate the water level south of the city Flood mitigation is needed due to an expected increase in surface water related to a new road under construction, changes in water supply to the city and expected changes of climate and precipitation. Changes in...
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Influence of corroded segment joint on strength of shield tunnel
Abstract: There are some cases where shield tunnels are distorted because of the wide-area ground settle-ment caused by consolidation of surrounding soft clayey ground, adjacent construction and others. To properly maintain the shield tunnels, it is desirable to predict the magnitude of distortion and consider the necessity of measures. Corrosion of segment joints caused by chloride attack is observed in...
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Centrifuge modelling of Large diameter Tunnels in Improved soils
Abstract: Singapore is a small island nation, approx. 700km in area and a home to about 5.498 million population, making it a densely populated city . With the mis-sion, “to provide Singaporeans with a world class transport system” , the major ob-jective is ‘to provide a quality, integrated and efficient land transport system.....” . In order to achieve its objectives, one of the major strategy is to...
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Tunnelling technology for marine pipeline installations
Abstract: The situation in coastal areas is becoming critical. More and more people are moving to the world´s urban centers. Big cities are turning into megacities with more than 5 million inhabitants. Most of these megacities grow up in coastal areas. Cities like Jakarta, Lagos, Manila, Mumbai, Bangkok, New York, Osaka-Kobe, Rio de Janeiro and Shanghai have one thing in common: they are all located on...
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Development of Decision Support System on tunnel diagnosis
Abstract: Managing a large register of tunnels requires dealing with the need of guaranteeing a good safety and service level while optimising their overall maintenance cost. This is particularly critical for infrastructure owners with an important number of tunnels, which implies large tunnel condition heterogeneity, such as: urban or mountainous environment, climatic conditions, geological and...
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Cross-City-Link – Optimization of the Smoke Extraction System
Abstract: The approximately 5 km long Weinberg Tunnel, the enclosed ramp towards Zurich Altstetten sta-tion, and the 420 m long railway station “Löwenstrasse” together form the Cross-City-Link under-ground tunnel system. In normal operation the system is naturally ventilated due to the piston effect of the trains and the ambient portal pressure differences. No mechanical ventilation is re-quired for a...
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