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World Tunnelling Congress
WTCThere are 1984 documents.
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FE model of resistivity survey for prediction of mixed ground ahead of a tunnel
Abstract: Prediction of unexpected geological risks in front of a tunnel face is essential to safely excavate a TBM tunnel. In this study, an FE model for simulating electrical resistivity surveys was developed to predict risky mixed ground conditions ahead of a tunnel face. The model is validated by comparing with the electrical resistivity obtained from the analytical solution corresponding to a...
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FEDRO’s Tunnel Renovation Method
Abstract: To ensure the availability and usability of the motorway network, the Federal Roads Office (FEDRO) developed new solutions for the renovation of road tunnels while keeping them open to traffic, and initiated a pilot project. The aim was to replace a non-reinforced inner shell at night and ensure the availability of all lanes during the day. The solution involved partially removing the existing...
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Fiber Reinforced Polymer (FRP) rockbolt as
Abstract: Mined caverns are becoming increasingly popular underground structures. They offer a unique solution to space constraints, especially in dense urban environments. In large excavations, and when permitted by the rock mass, permanent rock-bolts combined with sprayed concrete are logical alternatives to concrete lining. On the heels of the successful project of the Jurong Rock Caverns in...
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Field measurement of 3D effect of forepoling during conventional tunneling
Abstract: Forepoling—the use of a pipe umbrella—during conventional tunneling is widely used in poor ground conditions to stabilize the tunnel face. Recently, numerical analysis has been more widely used in the design of forepoling. In 2D numerical, it is often said that tunnel displacement or stress generated in tunnel supports may be reduced with forepoling. However, such effects have been fully...
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Finite Element Modelling for settlement assessment for an actual tunnel project
Abstract: Soil behavior at the intersection of a main tunnel and a cross passage is a complex, three-dimensional problem and only threedimensional methods can provide a complete analysis of the stresses and displacements occurring in the environment surrounding the opening. The present study uses 3D numerical analysis to investigate the surface settlement and the extent of the plastic zone generated...
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Finite elements analysis of bored tunnelsusing contraction rate method - The
Abstract: Tunnel design requires increasingly numerical analysis in order to provide densely scattered predictions about settlements along the project. For this reason, simple but reliable methods should be used. Contraction rate method meets the requirements: a low number of parameters is necessary and analysis can be made in only one calculation phase. These parameters depend on the geotechnical...
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First Subway in the Philippines - Part II Issues and Challenges in Planning
Abstract: Metro Manila Subway Project (MMSP) is the first planned subway project in the Republic of the Philippines, which is planned to be constructed in Metro Manila. This project is funded by Japan International Corporation Agency (JICA) and is considered as the project that will have a huge impact to Metro Manila in terms of upgrading the transportation standards. Upon completion, this will have an...
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From Conventional to Numerical Design Steel Fibre Reinforced Segmental Lining
Abstract: In this contribution, a multilevel computational modelling framework is proposed to investigate the response of steel fiber reinforced lining segments subjected to thrust jack, grouting and ground loadings. This simulation approach offers an opportunity to directly investigate the influence of type and content of steel fibers on the performance of segmented linings at the structural scale....
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Full Paper Template for Publication of WTC 2021 Proceedings (2)
Abstract: In the Greater Paris area, there is a transition in the underground uses, which is developing with a double-policy: A renewal policy of existing undergrounds with experiments in new uses within Paris Intramuros ; A policy of deepening underground potential with the dynamics brought about by the transition of urban mobility and the Greater Paris project. The objective of this study is to include...
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Full -scale experiment of the TBMsoilpile interaction in Parisian subsoil
Abstract: When tunnels are constructed in urban areas, excavation is often carried out under the water table and beneath structures which, in many cases, are founded on piles. In this context, pressurised Tunnel Boring Machines (TBM) are used to minimise ground movements in the urban environment. To limit damages generated by the excavation works, it is essential to give the best prediction of tunnelling...
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Fundamental study on tunnel excavation analysis with considering groundwater
Abstract: If a large amount of water inflow occurs suddenly during the construction of a mountain tunnel, it may lead to a deterioration of construction performance and collapse of the tunnel face. In addition, it is expected that the ground water inflow will have a significant impact on the living environment of the neighboring residents at the tunnel construction site in the case of a small overburden....
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Fundamental study on a three-dimensional seismic reflection method in tunnels
Abstract: We are developing a seismic reflection method as a convenient, portable method of surveying rock and geological conditions ahead of tunnel faces. In this paper, a round of verification experiment conducted during actual tunnel construction is described, and then the characteristics of the three-dimensional measurements obtained are discussed. Four arrangements of three-dimensional seismometers...
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Future Underneath The Way Ahead for Sustainable Underground Structures
Abstract: This paper titles ‘Future Underneath: The Way Ahead for Sustainable Underground Structures’ deals with the site constraints faced during the planning stage of R K Ashram – Derawal Nagar stretch of R K Ashram-Janakpuri Corridor of Phase-IV of Delhi Metro Rail Transit System and the innovative measures undertaken by the DMRC to ensure the feasibility of the initially planned corridor outgrowing...
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GeoBIM for handling geological and geotechnical uncertainties in tunnelling
Abstract: In tunnelling, still unforeseen conditions concerning the geological environment is the main reason for claims. Excluding water, the uncertainties are basically of two kinds – geometrical and design values – e.g., rock coverage or rock quality. A new method has been developed for handling the geometrical uncertainties in tunnelling projects. The method is based on the GeoBIM concept for...
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Glass Fibre Reinforced Polymer (GFRP) permanent rock bolts
Abstract: Glass fibre reinforced polymer (GFRP) is a composite material with many advantages compared to steel – both structurally and in respect of the embodied carbon in the material. Tensile elements like reinforcing bars and rock bolts can be manufactured from GFRP. While they have an excellent tensile strength, because most glass fibres are aligned in the longitudinal direction along the bar, the...
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Grand Paris Express Line 16 -1 innovation and challenges of a 9.87m bored tunnel
Abstract: The Grand Paris Express is the largest active tunnelling project in Europe. It involves 200 kilometres of automatic metro systems, with 4 new lines and 68 new stations in the Paris metropolitan area. Eiffage is in charge of constructing the Line 16’s first contract, which is the biggest one of the whole Grand Paris Express project. It includes the excavation of four new stations and 20 km...
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