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World Tunnelling Congress
WTCThere are 1984 documents.
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Porto Maravilha project – infrastructure works
Abstract: The Porto Maravilha Operation, in Rio de Janeiro, comprises a series of infrastructure works, among them a new road system in the old port area, namely the Binária and Expressa ways. The Saúde tunnel is part of the Binária way, and was constructed in the Saúde hill, part of a deactivated old quarry, having two 2 three-lane carriageways plus a parallel LRV track. With a 300m cross section, the...
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Measurement of cutter forces acting on disc cutters with different ring shapes during linear cutting tests
Abstract: Predicting the cutter forces that act on disc cutters is essential for the design and performance evaluation of tunnel boring machines. Here, we present the results of an experimental evaluation of the differences in cutter forces and stresses with changes in the ring shape of a disc cutter. Cutter-normal and rolling forces, and cutter-normal stresses increase in proportion to the contact area...
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Tunnelling in Mixed Ground Condition - A Challenge to Design and Construction
Abstract: In one of the civil contracts of Downtown Line 2 in Singapore, the construction of twin bored tunnels was conducted using Slurry TBMs. The TBM drives faced challenges involving high abrasivity and high permeability of the Bukit Timah Granite Formation. Due to its variability of weathering properties, such geological formation often leads to frequent cutter-head interventions and other...
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ECOMINT – Waterproofing tunnels by thin shells
Abstract: The purpose of the ECOMINT project is to test three innovative repair processes for treating water seepage in tunnels: TECTOPROOF CA - an extra thin adhesive shell composed of an epoxy resin matrix impregnated with fiberglass ; MasterSeal 345 - an adhesive “sandwich” shell composed of a temporary waterproof levelling mortar, a sprayed waterproofing product and a sprayed reinforced concrete ;...
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Assessment of Tunnel Stability with Geotechnical Monitoring
Abstract: Application of tunnel design to site conditions requires continuous monitoring of deformation, review and revision of design considerations. A twin tube road tunnel has been constructed through the heterogeneous weak rock conditions involving sedimentary and volcanic units. Close distance between the tubes due to highway alignment constraints, lowering the water table due to excavation...
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The Xicotepec road tunnel collapse in Mexico - an investigation of the causes and the reconstruction project
Abstract: The road tunnel Xicotepec is under construction since September 2011 as part of a modern Highway project connecting Mexico City with Tuxpan, in the coast of the State of Veracruz. Along the mountain system known as Sierra Madre Oriental, very complex geological formations are passed across, consisting of diverse type of Jurassic sedimentary rocks, coexisting with volcanic deposits from the...
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Design of tunnels for combined traffic motor transport and metro
Abstract: The paper reviews the experience of design and construction of the two parallel tunnels in Moscow with the diameter of 14,2 m each, designed for the combined traffic: automobiles in the upper level and metro trains in the lower level. A concrete roadway slab was constructed for automobile transport in the tunnels at the level of the horizontal diameter. A new layout and arrangement decision...
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The Tunnel Kresna – the longest twin tube road tunnel in Europe will be in Bulgaria!
Abstract: There are five significant European corridors passing through Bulgaria. Within the road transport the priority is the completion of highways Marica, Struma and the Black Sea. Struma highway is a part of Trans European Corridor no. IV from Sofia to Kulata and provides north – south route through Bulgaria. Tunnels Zheleznitsa and Kresna are part of the Struma Lot 3 highway. Tunnel Zhezeznitsa is...
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15 m EPB project for highway tunnel in Sicily - Direct On Site Integration helps meet the challenges
Abstract: ANAS, the Italian National Company for Roads and Motorways, has initiated major road works in Sicily in order to expand the traffic capacity between the main regions and cities of the island. The city of Caltanissetta, in the centre of Sicily, is a strategic connection point between the East-West corridor and the South West part of the island. The programmed motorway works include the...
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Seismic Analysis of Shaft and Tunnel Intersection Considering Strain-Dependent Rock Mass Behaviour
Abstract: Seismic analyses of the intersection of a shaft and an inclined tunnel were performed based on experimental results obtained with the developed nonlinear dynamic module. Analysis results showed that vertical and horizontal displacements seen in nonlinear analysis are larger than those seen in linear analysis. Also, nonlinear analysis shows bigger bending compressive stress acting on shotcrete....
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Monitoring the Variation of Rotor Pressing Forces and Horizontal Soft Soil Pressure during Shield Tunneling
Abstract: The authors carried out a geo-mechanical monitoring of shield tunneling in soft loam. The forces N in cutterhead-pressing jacks are controlled by the pressure cells in hydraulic systems at the second “Serebryanoborsky” tunnel driving (D = 14.2 m) in Moscow. The curve N oscillates. Laws of change of the horizontal component of soil pressure caused by formation of slip planes in rock mass ahead...
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Settlement behaviour of Immersed tunnels on sand bed; monitoring and analysis
Abstract: Immersed tunnels that are founded on a sand bed with the sand under flow method show long term settlements; more than had been expected prior. At the Vlake tunnel in 2001 due to differential settlements this has lead to overloading of the collar structure in a segmental joint causing water and sand inflow. In this paper long term settlements as derived from monitoring of a number of different...
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The biggest TBM/EPB in the world: a challenging experience
Abstract: The Sparvo tunnel is part of “Variante di Valico” highway project, between Bologna and Florence in Italy. This contract was acquired by TOTO Costruzioni Generali S.p.A for 190 Mio€. Here a mechanized method was applied by using the world’s largest TBM called “Martina”, with an exceptional diameter of 15.62 m. BASF contributed to the successful TBM tunneling at Galleria Sparvo by supplying...
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Structural behavior of precast tunnel segments under TBM thrust actions
Abstract: Precast elements for tunnel linings are design by considering several loading conditions. Some of these loading configurations can be studied by means of simplified analytical approaches which enable to easily include the FRC resistant contribution according to the design rules proposed by fib Model Code. On the other hand, some mechanisms need to be studied by means of NLFEA in order to...
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Empirical and Statistical Models for Predicting Blast Induced Ground Vibration due to Tunnel Construction
Abstract: One of the major environmental impacts related to blasting operation in tunnelconstruction is ground vibration. The elastic energy which is at a level less than the energy requiredto break the rock, increases the ground vibration. Ground vibration is a matter of great concern as itmay cause damage to the existing adjacent structures depending upon the intensity and duration ofvibration. The...
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Mutual influence of foundation elements and anchor pile design of a top down diaphragm wall tunnel
Abstract: In the Delft railway Tunnel project, the interaction between the applied foundation elements played an important role. Diaphragm walls were installed at close proximity to existing piled foundations of a railway viaduct and grout anchor piles were realized in between prior installed diaphragm or sheet pile walls. A large amount of cone penetration tests were performed to investigate the mutual...
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