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World Tunnelling Congress
WTCThere are 1984 documents.
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Refurbishing old tunnels using RamArch
Abstract: Thousands of kilometres of tunnels that are now well over 100 years old are of vital importance to the economies of many countries yet most have endured much of their life with little or no maintenance. In 2006 UK’s Network Rail approached Innovative Support Systems (ISS) for a temporary railway tunnel support system that could be rapidly and, in particular, safely installed in their main line...
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Rehabilitation of the Hugh L. Carey and Queens Midtown Tunnels in New York City
Abstract: The Triborough Bridge and Tunnel Authority (TBTA) is conducting a comprehensive rehabilitation and systems update of the Hugh L. Carey Tunnel (HLCT) and Queens Midtown Tunnel (QMT) in New York. Opened in 1950, the HLCT is 9,117 ft. (2,779 m) long and includes two parallel tunnels with 4 lanes. Opened in 1940, the QMT is 6,414 ft. (1,955 m) long and includes two parallel tunnels with 4 lanes....
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Reinforcement Measures for Tunnels with Large Deformation
Abstract: During excavation of the Matsukaya Tunnel in fragile pelitic schist, a horizontal displacement of up to 770 mm occurred on one sidewall, damaging the primary support and heaving the invert. To stabilize the tunnel during excavation and to prevent the deformation risk during service, the invert was reinforced with struts and the lining was fiber-reinforced. Moreover, a numerical analysis was...
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Reliability analysis of early age concreteliner subjected to blast vibrations
Abstract: Early age concrete has a limited resistance to vibrations, and lasting implications for the entire lifetime of the liner occur when this resistance is exceeded. This paper presents a method to assess the probability of cracking in early age concrete liners subject to blasting vibration that allows for the optimization of construction time while ensuring an adequate performance. The method is...
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Research and Application of Early Warning Method for Shield Machine Tail Seal
Abstract: ITA-AITES World Tunnel Congress, WTC2022 and 48th General Assembly Bella Center, Copenhagen 2 - 8 September 2022 Research and Application of Early Warning Method for Shield Machine Tail Seal N. Wang1, X.L. Wei1, F.L. Lin1, J. Zhang1 1 China Railway Engineering Equipment Co., Ltd. Zhengzhou, Henan, China E-mail: shijiesuidaodahui@163.com Abstract: Aiming at the construction risks such as water...
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Research and Application of Gradient Hardness Disc Cutter Ring Key Technologies
Abstract: Shield or TBM tunneling method requires high requirements on the design and manufacture of disc cutter, especially for the material and heat treatment process of cutter ring. With the increase of projects using shield machines or TBMs, it’s difficu lt to accurately predict the complex geological conditions, especially upper soft and lower hard stratum, which will easily cause the block collapse...
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Research on Grouting Materials of Grouted Mortise -Tenon Joint for Prefabricated
Abstract: Joint is the most important feature of prefabricated structure different from conventional cast-in-place structure. One kind of unique grouted mortise-tenon joint is used in the prefabricated metro station first built in Changchun, China. The grouting material is the key factor to determine the construction and bearing characteristics of the joint. In this paper, a thorough research on joint...
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Research on Load -bearing Capacity of Partly Repaired RC Segments
Abstract: Segmental tunnel linings constructed in the ground near the sea need attention with regard to the deterioration of reinforced concrete segments caused by salt damage. For segments seriously affected by salt damage, a repair method that replaces part of the deteriorated segments with a new material to recover its durability is used. However, the effect of this method on the load-bearing capacity...
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Research on Safety Evaluation Method of Damage and Failure Evolution Process
Abstract: The failure process of surrounding rock in underground caverns is a damage evolution process from elasticity to plasticity and then to cracking damage since the complex excavation process of underground caverns. To reveal the damage and failure evolution law of surrounding rock during the complex excavation process and to provide a quantitative index for the safety evaluation of surrounding...
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Resilient cities through underground infrastructuresworldwide relevant cases
Abstract: Underground infrastructures can be the preferred mean to deliver regular services to our urban communities, particularly during catastrophic events and major disruptions. The ongoing pandemic emergency has led engineers and planners to rethink the metric of success for future infrastructures. In addition to the underground structural Stability based on engineering principles, the concept of...
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Risk Assessment for Stability at Tunnel Cutting Face - Spectrogram Analysis for Waves Generated by Blasting
Abstract: The blasting method is used for tunnel excavation in hard rock. In the blasting, waves such as seismic waves propagating in rock and blasting sounds propagating in tunnel are generated. Spectrogram is signal processing in time and frequency domain, frequency characteristics are evaluated for rock condition at a tunnel cutting face. In this study, spectrogram analysis is carried out for blasting...
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Risk mode lling techniques for complex tunnelling projects
Abstract: Although the outdated idea of calculating risk as the deterministic product of its likelihood and impact is not entirely a thing of the past, a multitude of organizations have adopted the usage of probabilistic methods for risk analysis, as they better reflect the inherent uncertainty of cost and risk estimates with ranges. But are these advancements far-reaching enough in a complex environment...
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Ritom Power Plant Renewal with New Inclined Pressure Shaft
Abstract: Increasing capacity with new power plant facility to generate traction power and three-phase power - Ritom SA, a partner company of the canton of Ticino (25%), represented by Azienda Elettrica Ticinese (AET), and of the Swiss Federal Railways (SBB, 75%) will replace the Ritom power plant between Ritom lake/reservoir and the village of Piotta (Switzerland), which has been in operation since...
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Rock Tunnels at High Water Pressure Non -Continuous Pressurized Tunneling vs. Slurry Tunneling
Abstract: The choice of TBM type is never easy, but it becomes especially challenging when faced with a hard rock tunnel with expected high water pressures. While Slurry Shield tunneling has a long history of addressing this problem, this method has not always been problem-free and can prove costly. At recent projects around the world, two other methods have proven themselves in hard rock under water...
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Route selection for a railway tunnel in the centre of Prague
Abstract: Railway tunnel Dejvice – Veleslavin is a part of a wider railway upgrade scheme linking the city centre of Prague and all three Prague metro lines with Vaclav Havel airport Prague and the city of Kladno. This paper maps the bumpy route to the selection of the preferred railway alignment option which started in 1999. The objectives of this paper are to describe changes in people’s perception of...
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Segmental Lining Design Optimization Against Reliable TBM Thrusting Conditions
Abstract: TBM thrust is, in many precast segmental lining designs, the critical loading condition when deciding between only FRC (Fibres Reinforced Concrete) or hybrid solutions (fibres + steel conventional bars). Traditionally, the TBM (Tunnel Boring Machine) pushing value used as reference by designers, when structurally checking this temporary stage, has been the maximum (or exceptional) thrust...
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