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World Tunnelling Congress
WTCThere are 1984 documents.
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Collapse Mechanism of Tunnel below Underground Structure
Abstract: The collapse mechanism of a tunnel in free field sandy soils with a high water table is generally known as cone- or chimney-shaped. However, when a tunnel is constructed below an underground structure with a much larger width than the tunnel diameter, the stiffness of the structure significantly affects the settlement profile and even the collapse mechanism. The recently reported tunnel...
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Challenges regarding ventilation, aerodynamics and tunnel environmental control of the Stuttgart 21 project
Abstract: Stuttgart 21 (S21) is a railway project under construction in Germany. The existing Central Station in Stuttgart shall be transformed from an above-ground terminal station with 16 tracks to an underground through-station with 8 tracks. About 500 ha of downtown area will become cleared for urban development. A network of 30 km of mostly twin-tube, single-track, high-speed tunnels shall provide...
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Deep urban excavations with flexible support at Riyadh Metro Line 5
Abstract: Riyadh Metro Line 5 is currently under construction by FAST Consortium. It crosses the city centre with a tunnel length of 13.2 km, mostly TBM excavated, involving also major deep surface excavations to suit 12 underground stations, 3 TBM launching/exit shafts and 12 functional shafts. The stations initially required the excavation of rectangular boxes of around 140x27 m, up to 29 m deep. The...
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A Virtual Reality Monitoring System for Tunnel Boring Machines
Abstract: We present a VR system that allows to monitor tunnel constructions based on tunnel boring machines and segment linings. Today a variety of sensors and measurements are combined to control the process. This includes cutting disc forces, TBM navigation data, tunnel face images, deformations of the tunnel wall and more. This wealth of information is difficult to comprehend in its entirety by...
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Structural design calculation tool of Steel Fiber Reinforced Concrete(SFRC) segmental lining
Abstract: Segmental lining for tunnel support in shield TBM method refers to the precast segment built in the factory. In most TBM tunnel segments, many rebar is used to reinforce concrete. So reducing the rebar cost is significant in TBM shield tunnel construction method. Therefore, reinforcing the steel fiber instead of rebar can improve economical efficiency as well as structural safety, which...
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Safety precautions against fuel leakage into NATM tunnels of Uskudar – Umraniye - Cekmekoy Metro Project
Abstract: A sudden water inrush occurred along with fuel from the old / unused underground storage tanks of a fuel-station through one of the forepooling drills and thus, construction of the double- tube NATM tunnels with 30 m bench cross-section was stopped on 12 June 2015 in Uskudar - Umraniye - Cekmekoy Metro Project. The risks and safety precautions for re-starting the construction, are summarized....
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Use of innovative underground solutions to increasing the resiliency of Istanbul: the case of new metro lines
Abstract: The progressive replacement of vehicular mobility with underground transit is the strategy worldwide adopted to overcome problems from GHG emissions to perception of urban quality. Most part of operative problems, when enforcing such strategies, derives from pre-existing conditions of urban settlement. In this light, Istanbul is a typical example. Many historic layers mix up with today’s urban...
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Addressing Uncertainties in upgrade of Victorian tunnels as part of the Edinburgh to Glasgow Improvement Programme
Abstract: The Edinburgh-Glasgow Improvement Programme (EGIP) aims to enhance train capacity of the main line between Edinburgh and Glasgow. As part of the scheme two brick lined tunnels along the route required upgrading, which comprised replacement of sections of track and ballast with a slab track system, fitting of new drainage and Overhead Line Equipment. Both tunnels were constructed in the 19th...
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New abrasion test (NAT) for the evaluation of hard-rock TBM cutter life
Abstract: Despite the presence of some rock abrasivity tests, the tunneling industry still seeks for a reliable method to simulate the real TBM excavation condition and to connect the test results with the cutter life data from the field. New abrasion test (NAT) is a test developed in Hyundai Engineering and Construction to improve some of the deficiencies of the previously developed hardrock abrasivity...
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The new tunnel construction method applying both cast-in-place concrete linings and segment linings by using a single...
Abstract: The Hazawa Tunnel is constructed by using a new tunnel construction method. The method is tunneling with a single TBM capable of installing both the precast segmental linings and the cast-in-place concrete linings by SENS (acronym for Shield tunneling method, Extruded concrete lining, New Austrian Tunneling Method, System). The segmental lining is stronger than the cast-inplace concrete lining,...
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Solutions for minimization the soil settlement using EPBM innovations
Abstract: As is known, the maximum reduction in the earth's surface displacement may be achieved if Slurry Shield applies. In this paper we propose measures to improve the work of the EPB-Shield based on new structural and design solutions. Recommendations were developed for planning replacements of the cutting wheel. When scheduling a replacement of the cutting wheel rock abrasiveness indicator should...
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Successful EPB-Tunnel Drives with Conditioning Agents based on Laboratory Research
Abstract: For each project with an EPB-Shield and its unique soil conditions it’s required to specify the properties of the conditioning agents as well as the properties of the conditioned soil and to determine and monitor these properties. The testing of conditioning agents and conditioned soils in the laboratory helps to enable a successful tunnel drive. Because of that the most important types of soil...
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Risks in Tunnelling: Analysis, Procedures and lessons learned relating to the Zurich Cross Rail
Abstract: The tunnels and the underground station of the Zurich Cross Rail can be characterized as extremely challenging and is at the limit of the technical feasibility. In tunnelling the growing complexity of technical problems as well as the high safety level required during construction call increasingly for a methodical procedure in the analysis and handling of risks. It is of vital interest that a...
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Copenhagen Cityringen Project: Passage with minimum cover under historical building - compensation and jet grouting...
Abstract: The Cityringen project will form a new circular line in the city centre and will consist of 21 new stations and approx. 31 Km of EPB twin-bored tunnels. The Kongens Nytorv passage is one if not the most delicate in the project. After launching from Kongens Nytorv station, the TBMs cross the existing metro tunnels, passing above them with a clearance of just 1.5 m, to immediately dive underneath...
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Three-dimensional visualization of methane concentration distribution in tunnels to increase underground safety
Abstract: This study presents a new approach to increase construction safety under methane inflow conditions by providing the three-dimensional concentration distribution of methane in underground structures. The study was conducted at the Horonobe Underground Research Laboratory, which is located in Neogene sedimentary rock where groundwater contains dissolved methane. As conventional gas sensors are...
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Load-bearing and Bonding Behavior of Hybrid Concrete Tunnel Lining Segments
Abstract: Concrete damages occurring frequently in the peripheral zones of segments cannot be prevented by using conventional steel reinforcement due to the adherence of minimum concrete cover. Based upon this fact, a new concept has been developed to manufacture hybrid concrete segments with a so-called “fresh on solid” production procedure. In this procedure, tailor-cut precast components made of...
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