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World Tunnelling Congress
WTCThere are 1984 documents.
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Mechanical behavior of the semi-rigid immersed tunnel structure based on the Hong Kong Zhuhai Macao Bridge Project
Abstract: For traditional immersed tunnel construction method, segments are clamped together temporarily by longitudinal prestressing cables which are later cut off at each of the joints after the tunnel element has been placed. This form of tunnel element can be called as the flexible scheme and has the advantages of deforming more freely with the ground and reducing the internal force produced in the...
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Numerical investigation of the interaction of parallel twin tunnels during excavation and support
Abstract: The construction of twin tunnels is a prevailing practice in either conventional or mechanized shield-driven tunnelling for security and functionality. Despite that, existing methodologies for tunnel design usually focus on single tunnels, neglecting the potential interaction between neighbouring tunnels. Such interaction can have significant effects, especially in closely spaced twin tunnels....
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Numerical analysis of the effects of new building constructions on existing tunnels
Abstract: From a general engineering point of view, urban development involves among other things the growth of underground transit systems on one side and the continuous increase of new constructions at the ground surface on the other. Several accurate studies have investigated the effects of tunnelling on nearby existing structures, in order to limit or prevent any possible damage to them. Not quite...
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Normal Operation Road Tunnel Ventilation Control Optimisation. Portal Emissions Control Analysis
Abstract: Air pollution produced in road tunnels is identical to that produced on open roads, where by the quantity of pollutant emissions is largely proportional to the number of vehicles, the distance covered and the road gradient.Both surface and sub-surface roads have an impact on environmental air quality which can be measured by pollutant concentrations. Placing traffic underground in road tunnels...
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Next steps in the improvement of health and safety in design of underground structures
Abstract: Every year in Great Britain the construction sector reports approximately 3.5% of workers suffer an illness they believe to be work-related. Furthermore, in Great Britain it is estimated 13,000 people die each year from work-related ill health, primarily due to past exposures to chemicals or dusts – identifying these long-term impacts is an essential part to protecting the workforce. Risk...
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NATM Tunneling in Urban Area, A Review of Planning, Executing, and Monitoring in Tehran Metro Line 6
Abstract: The EPB-TBM is usually used in a ground which has a significant part of finegrained soil. A suitable ground for an EPB machine, after excavation and entering into the pressure chamber, becomes a plastic material with required ability to apply the face pressure. Tehran metro line 6 project with length of 31.2 km has an extension part about 6 km. The path of extension part is located in both of...
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Modification designs for TBM Assembly of Mae Tang-Mae Ngat-Mae Kuang Water diversion tunnel project, Chiang Mai...
Abstract: Mae Tang-Mae Ngat tunnel project in Chiang Mai Province, Northern Thailand is a part of Mae Kuang Reservoir Inflow Augmentation project. The main objective of the whole project is to diverse annually the surplus water about 147 million cu.m from Mae Tang river to Mae Ngat reservoir through a tunnel with a length of 25.4 km and a diameter of 4.0 m, and then transfer the water from Mae Ngat...
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Minneapolis Southwest LRT: Design Chal lenges of Cut-and-Cover Tunnel Construc tion in Urban Area
Abstract: The Southwest Light Rail Transit (LRT) (METRO Green Line Extension) Project is a proposed extension of the METRO Green Line (Central Corridor LRT) that would operate from downtown Minneapolis through the communities of St. Louis Park, Hopkins, Minnetonka, and Eden Prairie, passing in close proximity to Edina. The proposed alignment includes 16 new stations (including one that has been deferred...
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Measurement of Massif temperatures through the Maddalena Exploration Tunnel
Abstract: The New Lyon-Turin Line (NLTL) is an essential component of the“Mediterranean Corridor”, one of the nine European Union TEN-T network corridors, the future “European metropolitan railway” that will promote the movement of people and goods by rail, an ecological mode of transport. The cross-border Section extends from Susa-Bussoleno (Italy) toSaint-Jean-de-Maurienne (France) ; it is the frst...
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Long-Term Subsidence of A Shield Tunnel in Alluvial Clay
Abstract: Underground construction in the low-permeability ground often leads to long-term continuous ground subsidence. By tunneling, new drainage boundaries introduce into the ground system and water content around tunnel changes. The decrease in pore water pressure around tunnel causes consolidation of low-permeable soil around the tunnel. The existence of small cracks or construction defect in the...
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Key technology of auxiliary air pressure balanced mode for shield tunnelling
Abstract: When tunnelling under common mode, shield usually performs with large load, and high cutter tool consumption in the mixed face condition with water-rich and good air-tightness layer, or in the rock layer with deep overburden and fissure water developed. In this case, the screw conveyor spewing usually occurred, and the efficiency of shield tunnelling is reduced and tailskin grouting quality...
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Key technique analysis of new pipe roofing method for constructing ultra-shallow buried subway station
Abstract: Combination of STS and PBA is firstly applied to construct ultra-shallow-buried subway station, and it lacks of theoretical research and engineering experience. Based on the Aoti Center subway station, force mechanism of STS structure is investigated in the construction stages. The results indicate that The new STS piperoofing method can improve the overall bearing capacity compared to...
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Kerf Depth with Abrasive Waterjet Power for Hard Rock Cutting
Abstract: Abrasive waterjet cutting technology is used for rock tunnelling and mining because the process is eco-friendly. To estimate precisely the waterjet operating time and cost, it is important to verify the kerf depth generated by the power of the abrasive waterjet power (e.g., water pressure, water flow rate, or traverse speed). In this study, rock excavation using an abrasive waterjet cutting...
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Shatin Central Link – First Variable Density Tunnel Boring Machine in Hong Kong for a Shallow Tunnel Drive
Abstract: The Shatin Central link (SCL) is one of the railway projects set out in the Railway Development Strategy (RDS 2000) by the HKSAR Government and is a new rail corridor providing a direct link between the New Territories and Hong Kong Island. SCL Contract 1128 involves the construction of two sections of twin tunnels between Causeway Bay Typhoon Shelter and Admiralty MTR Station, boring...
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Ismailia Road Tunnel crossing the Suez Canal
Abstract: The Ismailia road tunnel is a twin tube road tunnel that crosses the existing and new Suez Canal north of the city of Ismailia. It is part of a development project in the Suez Canal zone. The completion of the development project including the tunnel has the highest priority in Egypt. The project is to give a boost to economic growth in the region. It is being delivered to the client, the...
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Investigation of Construction and Installation Tolerances for Robust SFRC Segmental Lining Design
Abstract: This contribution is focused on the analysis of steel fiber reinforced concrete segmental linings under circumferential loads, where the area around the longitudinal joints is of particular importance. The occurrence of splitting stresses due to the partial area loading in combination with imperfections, conditioned by the construction process, often leads to a chipping of segment corners. The...
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