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Proceedings

Papers from WTC and ITA conferences have been made available as PDF documents.

ProceedingsThere are 1041 documents.

List of endorsed conferences

  • WTC

    World Tunnelling Congress

Showing 17 - 32 of 1041 documents
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    Abstract: The Himalayas is generally characterized by steep slopes, lofty hills, and complex geological and tectonic settings. Hence, detailed engineering geological investigations are warranted for planning new underground projects in the Himalayas. This paper describes a feasibility study performed for a planned road tunnel in Bhutan. The study included engineering geological mapping, rock mass...

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    Abstract: Urban railway tunnels are an important infrastructure for public transportation. A lin-ing of concrete is often cast to support the ground and protect the internal services in the tunnel. The durability of the concrete lining can be affected by the properties of the local groundwater. The water can flow through cracks or joints in the concrete and then start to attack the concrete from the...

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    Abstract: The behaviour of fibre reinforced concrete is more than a simple superposition of the characteristics of the concrete matrix and the fibres; to analyze the behaviour of this composite material, also the interaction between both has to be taken into account, i.e. the transfer of loads from the concrete matrix to the fibre system. A unique concept of fibres have been developed which combined high...

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    Abstract: The project to bypass the Schwarzkopf tunnel, which is being constructed at a cost of around 250 million euros, is the centrepiece of the line upgrade between Hanau and Nantenbach. The dimensions of the project, the existing boundary conditions and the resulting imponderables required a large number of special solutions for the tunnel construction, the management and the logistic. Fast and...

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    Abstract: Different excavation methods for railway tunnels have been considered for two different projects in Norway. Both projects are located within densely populated areas close to Oslo and designed to combine high speed and high capacity for the future operation of trains. The excavation of the tunnels was required to be performed within a limited time frame....

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    Abstract: Drill monitoring systems use sensors installed along the drill string to provide digital signals that measure the performance of the drilling machine. Drill parameters are automatically adjusted by a control system in order to optimize the operation. Understanding their mutual relations and how the drilling machine controls them is required for a proper rock mass characterization. This paper...

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    Abstract: Risk is inextricably related to every underground and tunnel project. This contribution elaborates on the tunnel’s whole construction cycle, discussing the paths followed from the analysis of the initial risk exposures until the placement of a bespoke insurance policy. The most prominent tunnel failure causes and hazard sources are explored, together with their consequential economic and...

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    Abstract: New metro lines are planned in Stockholm, comprising a total length of approximately 20 km with 10 new stations, mostly located underground. One of the new lines will pass under Saltsjön (a bay of the Baltic Sea) and through a major regional fault. The stress magnitudes and orientations around the fault are highly uncertain, and stress measurements are not practically possible near the fault....

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    Abstract: This paper will present the Ryfast project. Ryfast is located in Stavanger in the western part of Norway and is one of the largest ongoing tunnelling-projects in Norway. The aim of the project is to improve the traffic situation in the region and create a ferry free connection between the city of Stavanger and the region of Ryfylke. The construction work started in 2013, and the project has an...

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    Abstract: Semmering Base Tunnel, one of the major infrastructure projects in Europe, consists of two 27.3 km long single-track tunnels, numerous cross passages and a complex underground emergency station with two, more than 420 m deep, shafts. Temporary access is provided by a 1.2 km long access tunnel, with two 120 m subsurface shafts, and two 100 m shafts from the surface. Various types...

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    Abstract: Lattice girders have been widely used as a temporary support or part of the permanent lining for NATM tunneling. In order to evaluate the structural performance of lattice girders reinforced shotcrete, influential factors such as diameter of main steel bar and diagonal bar, welding length, stirrup were studied. Moreover, interaction between rock and lattice girders reinforced shotcrete was also...

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    Abstract: During tunnel excavation, blast induced damage or Excavation Damage Zone (EDZ) interacts with existing geological structure of the rock-mass. This can and cause over-break and stability issues during and after excavation. Today the EDZ is determined by correlation-based methods, although direct measurement is possible. This paper presents investigation methods for EDZ quantification during...

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    Abstract: TBM cutter life and wear evaluation in soft ground are important issues, especially in pressurized face tunneling with soft ground TBMs for which the planning of costly interventions becomes crucial. This paper presents the evolution and latest developments of different methodologies and tests in cutter life evaluation in soil with a major focus on identification of the main influential...

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    Abstract: Tunnelling in soft ground in urban environment is a challenging task which requires comprehensive design solutions tailored to the particular ground and boundary conditions. This paper illustrates some interesting design solutions for tunnels with large cross-section below existing railway line and freeway tunnels below major freeway - both in Vienna in stiff clay and dense sands. Special...

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    Abstract: Tunnel seismic prediction while excavation is an attractive technology for underground rock mass characterisation due to the short downtime needed for data acquisition and fast data processing and evaluation. By recording the full wave-field of reflected signals, prediction of the rock mass quality up to 200 m ahead of the face is possible and 3D velocity distribution images can be generated by...

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    Abstract: Construction of Contract 2 for the twinning of the West Trunk sewer tunnel for the Region of Peel in the City of Mississauga consists of approximately 3,800m (12,500ft) of 3.0m (10ft) diameter trunk sanitary sewer. The new sewer is being constructed by tunneling using two EPB machines and installing precast concrete segments as the final liner. Two significant innovations are included in the...

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Showing 17 - 32 of 1041 documents