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World Tunnelling Congress
WTCThere are 1984 documents.
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Challenges of Tunnelling below the Operating Pasar Seni LRT Station, Kuala Lumpur
Abstract: The tunnel alignment of KVMRT – SBK Line traverses below the existing Pasar Seni LRT Station in Kuala Lumpur. The tunnel alignment passed through the toe of piles supporting the railway structures, which were required to remain open to the public during tunnel construction. No foundation settlements were tolerated at any time. Structural underpinning works were carried out to make these piles...
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Progressive Design Build Tunnel Procurement in Silicon Valley
Abstract: The Silicon Valley Clean Water Gravity Pipeline (SVCW) is among the first tunnel projects in the United States to be procured using the Progressive Design Build (PDB) method. Selected by SVCW to provide cost certainty after the 60% design level and to allow greater coordination of the design with operations and maintenance, PDB is being used by SVCW to procure two other major projects the Front...
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Overcoming Multiple Caverns: Successful TBM Tunneling in Karstic Geology at Galerie des Janots
Abstract: In April 2019, a 3.5 m diameter open-type, Main Beam TBM and its crew broke through at the Galerie des Janots Tunnel in La Ciotat, France after encountering two large, uncharted caverns. The 2.8 km long tunnel, excavated in limestone known to have groundwater, karstic features, and voids, took two years to complete due to the challenges encountered. Limestone and powdery clays made for slow...
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The S. Caterina Road Tunnel in Sicily (Italy): Intensive Use of Jet-Grouting Stabilization
Abstract: The 900 m long single tube S. Caterina tunnel in Sicily involves mediocre geological materials (yellow sands with calcarenite levels, blue-grey marly clays) and it crosses an area with many existing buildings under low overburden (max. 30 m). Thus, settlement control is one of the main issues to reduce the impact on the surroundings; for this reason, typical sections were defined with...
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Technology and Application of Large Diameter Slurry Shield Machine for Qiantang River Bo’ao Tunnel Project
Abstract: Qiantang River Bo’ao Tunnel Project crosses beneath the Qiantang River in Hangzhou, China where the river width is 1,300m and the average depth is 10m. With the total length of approximately 1,680m and the excavation diameter of 11.7m, the tunnel is constructed with shield tunneling method and travels through complex geological conditions, such as silt, clay and approximately 500m length of...
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Application of Porous Concrete to Pavement Base Course at the Cut and Cover Tunnel for Countermeasure of Water Leaking
Abstract: Yamatogawa-route of Hanshin Expressway is 9.9 km long and the most of them are cut-and-cover tunnels. As the slab and wall of the cut and cover tunnel is generally deep, many countermeasures were carried out to prevent thermal cracking and followed water leakage. Nevertheless, penetrated thermal cracks were observed to the concrete slabs and walls. The leaked coming-in water would make bad...
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Segmental Lining Design for Long TBM Tunnels in Hard Rock - Case Study Follo Line Tunnels
Abstract: The two 18 km long TBM tunnels of the Follo Line in mainly very hard rock have an overburden of up to 165 m. Lining design was extensive, having to cover for very different design situations while providing economic reinforcement. Numerical analyses were performed with full 3D-analyses and shift-iteration, Pseudo-3D- and 2D-FE-models for structural verifications and curved shell models for...
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Ground Improvement for Shallow Overburden of Bored Tunnels: Case study of 8th Drive in Klang Valley MRT Line 2
Abstract: Following the rising of underground spaces utilization in urban cities, it is inevitable to mine underneath public roads of heavy traffic flow. The 8th drive of SSP Line 2 includes a final stretch of 240m of shallow overburden which sits below East West Link Expressway that caters for high volume of traffic. Deep Soil Mixing (DSM) ground treatment method suitable to the local geological...
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Strategy for the permanent technical solution under the Lake Mälaren in the Stockholm Bypass Project
Abstract: The tunnels in the Stockholm Bypass Project connect the northern and southern part of this Nordic city passing through several regional fault zones and subsea passages. For instance, the passage under the Lake Mälaren, Sweden’s third-largest freshwater lake, and the regional fault zone in the Fiskar fjord constitutes one of the most challenging parts in this project. The uncertainties in this...
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The Use of Polymer Fibre Reinforced Concrete in Underground Construction Projects in Asia
Abstract: This paper discusses the rise in the use of polymer fibre reinforced concrete (PFRC) in underground construction projects in Asia. Historically, polymer fibres were mainly micro polymer fibres with tensile strengths of 200MPa to 400MPa. These micro polymer fibres were used in concrete to control cracks and prevent spalling of concrete during a fire in a tunnel. Polymer fibre producers...
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Stabilization of the Occidental Sector of the Ancient Quarry of Punta Lucero in the Port of Bilbao (Spain)
Abstract: This paper describes the construction works of slope stabilization in the ancient quarry of Punta Lucero, located in the facilities of the Port Authority of Bilbao. This intervention is necessary in order to prevent rockfalls, which threatened several critical energetic facilities implanted in the port platform. The works have been conceived using eco-design criteria, as the material obtained...
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Fissure Grouting for the Design and Construction of the North-South Cable Transmission Tunnel
Abstract: In the construction of deep shafts in rock, overcoming the problems caused by fissures and cracks in the ground is a highly critical task which can mean the success or failure of the project. Fissure Grouting is a technique of ground treatment where cracks, fissures and crevices particularly in rock are filled with cement based grouting materials to reduce the permeability and increase the...
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Experimental and Numerical Study on Waterproof Behavior of Segmental Joints in Hydraulic Shield Tunnels
Abstract: Segmental joints are vulnerable parts in the shield tunnels, and the waterproof ability of the sealing gaskets is an important indicator to ensure the safety and operation of the hydraulic tunnel. Based on the Pearl River Delta water resources allocation project, the waterproof capacity of segmental joints is experimentally studied. And a new numerical method, including fluid pressure...
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ZhangJiHuai Railway Project - The Use of a New Innovative System for Scanning in a Drill and Blast Excavation
Abstract: The Zhangjiajie-Jishou-Huaihua (hereinafter referred to as ZhangJiHuai) highspeed railway project has started its construction since 12th December 2016. The Jishou Tunnel, as an early start section and key control project of the line, first introduced tunnel scan system which has been widely used on the entire project. Tunnel scan system integrates 3D laser scanner and smart computer software,...
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Simulation on Shield Behaviour at a Sharp Curve by Kinematic Shield Model
Abstract: Due to ongoing development of shield tunneling technologies, usage of more complicated tunnel alignments is increasing. Excavation at a sharper curve needs proper steering of shield machines. Shield behavior is controlled usually by copy cutter, articulation mechanism, and jack force and moment. Then the kinematic shield model, which can take shield operation including the above shield...
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Road Tunnel Fire Safety: Developments in Standards and Fire Protection Technologies
Abstract: Road tunnel fires have been the subject of extensive study over the last 20 years that have passed since two major tunnel fires in Europe that occurred within 2 months of each other caused public concern over tunnel safety. Stakeholders such as government bodies, owners and designers are today better aware of the likely severity and consequences of a fire in a tunnel due major research work...
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