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World Tunnelling Congress
WTCThere are 1984 documents.
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Assessment of the drill-and-blast related overbreak in the BBT system
Abstract: Drill-and-blast is the common conventional tunnelling method in hard rock conditions. This paper analyses the characteristics of the blasting-induced overbreak in some of the tunnels of the Brenner Base Tunnel (BBT) system, in order to evaluate its correlation with the main geometrical and technical parameters of the excavation as well as the geomechanical properties of the rock mass. In...
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Assessment of the Limfjordtunnel using nonlinear FEA
Abstract: The Limfjordentunnel has an age of about 50 years and does not meet the requirements of an Immersed Tunnel using traditional design calculations and assumptions. In order to validate the structural integrity of the tunnel, an international expert group was formed and part of the research was to perform a non-linear analysis to indicate the capacity of the tunnel. For this analysis a 2...
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Assessment of Tunnelling on Existing Pile Foundations in Bangkok
Abstract: In recent years, the Mass Rapid Transit Authority (MRTA), Ministry of Transport, Thailand is implementing the MRT Orange Line Project East Section which runs along one of the most congested roads of the city. There are numerous of existing flyovers founded on piles situated nearby to the tunnel alignment. Their potential impact from the EPB shield tunnelling needs to be assessed in order to...
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Assessment of Volume Loss in Mechanized Shield Tunnelling
Abstract: A case study including monitoring data of surface settlements induced by tunnelling in Tabriz metro line 2 is presented. Presented measurements of surface settlements, were collected during the construction of western part of the project (between west depot and S05 station) where the tunnel was being excavated in sand and silt, using earth pressure balanced TBM with a cutting-wheel diameter of...
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ATG Ceneri Base Tunnel Driving Method and Producti on of Concrete Aggregates
Abstract: The inclusion of the idea of reuse into the overall process from planning to implementation is a central concern in underground projects. The maximum reuse of excavated tunnel material is important for several reasons. It can save material resources, reduce transport distances and landfill volumes and, last but not least, construction costs on a large scale. Aggregates for concrete can be...
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Automat ed Detection of Muck Types for EPB ShieldviaDeep Learning
Abstract: In the process of EPB shield tunneling, muck is a window to prob the soil condition just ahead of the tunnel face and engineers can keep abreast of the change of geologic condition accordingly. This paper presents a method for automated detection of muck types based on the images extracted from the on-site surveillance camera using deep learning algorithms. A practical muck classification...
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Automating Tunnel Inspections with Optical Remote Sensing Techniques
Abstract: In this paper a new concept and measurement results of a novel system that aims to replace the manual hammering for acoustic delamination detection using a remote sensing approach is presented. A strong, pulsed laser serves as a hammer and creates a plasma induced shockwave on the concrete surface. This shockwave excites characteristic, resonant vibrations if a delamination is present. A second...
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Axi s-symmetric and 2D numerical analysis for mechanized tunnel excavation
Abstract: Apice-Hirpinia section is part of Napoli-Bari High Speed Railway new infrastructure intended to receive investments to modernize and facilitate people's transportation for a total extension of approximately 18.7 kilometres. This study includes analytical characteristic-curve results compared with numerical modelling using FLAC. In addition, it considers a mechanized advancement (Tunnel Boring...
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Back-analysis on Saint Martin la Porte works of Lyon- Turin base tunnel
Abstract: The excavation of exploratory works of the Saint-Martin-la-Porte of the future Lyon-Turin railway line have highlighted the squeezing behaviour of carbonaceous shales of the « Houiller », with large convergences which continued far from the tunnel face, highlighting the time-dependent behaviour of this rock mass. The design of the excavation method, of the supports to be put in place and of the...
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Backfilling of 618m Steel Lining VerticalShafts Uma Oya Project, Sri Lanka
Abstract: Uma Oya Multipurpose Development Project is a hydropower project comprises of two RCC Dams which their reservoirs are connected by a Link tunnel. The water will transfer from first dam reservoir to the other and then it will transferred through a 15.4 km headrace tunnel to the top of a 618 m deep vertical pressure shaft. This shaft provides high pressure water with its suitable head for an...
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Bearing capacity of double-lining considering the stiffness degradation
Abstract: The double lining of external segmental lining and inner reinforced concrete lining are usually used for tunnels with high internal water pressure. However, the reinforced concrete is easily cracked under high internal water pressure, the optimal reinforced steel fiber concrete (R/FRC) can be a helpful option for the inner lining. The internal water pressure bearing capacity depends on the...
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Brenner Base Tunnel Emergency Stop at construction lot H33 Tulfes - Pfons
Abstract: The Brenner Base Tunnel incorporates the latest security standards in tunnelling. Besides the cross-connecting tunnels that link the two main tunnel tubes every 333 m and serve as an escape route, underground emergency stops connecting to the surface are located approximately every 20 km. This configuration conforms to a high security standard for tunnels. The emergency stops include a central...
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Brenner Base Tunnel Investigation in exploratory tunnel and support base
Abstract: During the hard rock TBM drive of the exploratory tunnel in construction lot Tulfes-Pfons H33, difficult rock mass conditions were encountered. In particular in the area of chainage 9.670 fractured rock mass and fault bands led to collapse after boring and overbreaks. The cavity caused by this collapse, named "Iris" was temporarily stabilized, so the TBM could end the drive successfully....
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Brief Introduction of New Key Equipment for Shield Tunnel Emergency Rescue System
Abstract: This paper provides a detailed introduction of multiple innovative key equipment for the shield tunnel emergency rescue system on the basis of a series of dangerous situations encountered during construction of shield tunnel, such as "land subsidence", "water inrush and inflow" and "collapse". The assembled rapid segment support frame reduces the risk of segment collapse; the developed rapid...
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Building a tunnel starting with the end (Opening Completion) in mind - The Tunnel
Abstract: The WestConnex M4-M5 Link Tunnels (WCX Stage 3A) project is a 7.5 km Sydney underground link connecting the WestConnex M4 East Tunnel at Haberfield and the WestConnex New M5 (M8) Tunnel at St Peters Interchange. The project commenced in June 2018 and is due for completion in 2023. The project comprises 21.6 km of roadheader tunnel excavation, tunnel civil fit out works, surface civil works,...
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BuildingSMART Internationa l IFC stand ards for underground infrastructures
Abstract: In June 2019, buildingSMART International (bSI, www.buildingsmart.org) launched the development of a neutral format, IfcTunnel, to structure and optimize data exchanges for underground infrastructure projects that complements the already available standards for the exchange of roadways, railways and buildings projects information. The international team (40 experts) that drives this effort is...
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