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World Tunnelling Congress
WTCThere are 1984 documents.
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Planning in Mechanised Headrace Tunnelfor the Uma Oya Project, Sri Lanka
Abstract: Uma Oya Multipurpose Development Project is in Sri Lanka. This project involves 2 RCC Dams connected by a Link tunnel constructed by D&B method. The water will be transferred from the first dam to the 2nd dam and then it will be transferred through a long 15.4 Km Headrace tunnel to the top of a 618 m deep pressure shaft that feeds the high-pressure water to an underground powerhouse for a...
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Platform water and hazardous liquid drainage - The example of the Mont Cenis Base
Abstract: Like for the other big railway tunnels under the Alps, the water drainage system of the Mont Cenis Base Tunnel provides 2 recovery systems: - one for the mountain waters considered clean; - one for the platform waters, whose potential hazardous liquids - from a possible leak on a wagon or lorry on a rolling highway train - require treatment before being returned to the river. This paper will...
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Port Said Tunnels under the Suez Canal - Cross passages with ground freezing in aggressive conditions
Abstract: The Port Said twin tube road tunnels are crossing the Suez Canal, Egypt, with length of bored stretch of 2,85 km. The tunnels were constructed in adverse soft soil conditions including groundwater with high salt concentration and the presence of dissolved methane gas. The twin tubes are connected with 2 cross passages of 17.4m length at 1km intervals. The two cross passages were constructed...
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Practical Application of a Cement-free Shotcrete for Tunnel Refurbishment
Abstract: Existing road and railway tunnels in Central Europe increasingly show signs of aging and deterioration, which is particularly evident in the tunnels’ inner lining. Due to dramatic tunnel fires, and novel research findings, German authorities have reviewed and revised several guidelines for the design of tunnel structures in recent years. In the national research project KOINOR, a cement-free...
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Precast Concrete Tunnel Segments Slenderness Ratios
Abstract: The slenderness of the tunnel segments is defined as the ratio between the breadth or curved length of segment along its centroid and its thickness. It is a key parameter for design of segment length between two longitudinal joints in a segmental tunnel ring. Review of tunnel projects show that rings are often divided into a number of segments that yields a segment slenderness of between 8 and...
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Prediction of occurrence of boulders in glacial soils
Abstract: Contents of boulders in soils may cause disputes between contractor and owner. Disputes may be avoided from fair baseline values in contract documents, for boulder content. A method of predicting boulder contents in glacial soils is presented. The method is based on two approaches which together utilise local geology, field observations and laboratory results, the latter from extrapolating...
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Prediction of Reaming Performance of Inclined Raises Using Pilot Hole Drilling
Abstract: Appropriate performance prediction of Raise Boring Machines (RBMs) in feasibility and planning stage of mechanized shaft excavation projects directly effects the economics of the projects and job completion time. This study aims to develop empirical performance prediction models for inclined reaming operations by using pilot hole drilling and reaming operational parameters and...
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Preventive Maintenance in Tunnelling for the Uma Oya Project, Sri Lanka
Abstract: Uma Oya Multipurpose Development Project involves 2 RCC Dams connected by a D&B Link tunnel which will transferred water from first dam to the 2nd dam and then it will be transferred conveyance a 15.4 km Headrace Tunnel to the top of a 618 m deep pressure shaft that feeds to an underground powerhouse for generation of electricity. The Headrace and Tailrace Tunnels are being excavated by two 4.4...
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Probabilistic Assessments Understanding Ground Uncertainties Impact on Safety
Abstract: The computers rapid evolution over the last two decades increased the spread of sophisticated and advanced design software. A clear example is the expansion of finite element modelling (FEM). Despite the high accuracy achievable with these models, the study of the geology and geotechnical conditions is often neglected. This paper shows how the application of probabilistic methods to the design...
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Problems Encountered in a Large Tunnel Excavated inGraphite Schists
Abstract: The T34 tunnel constructed within the scope of Ankara Istanbul High Speed Train Project. During the T34 tunnel excavation, deformations of up to 58 cm occurred between Km: 230+830 - 230+708. These deformations are far above tolerance and caused the failure of tunnel supports. When the deformation measurements were investigated, it was observed that the deformations resulted in the closure of...
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Quantitative Analysis on the Minimum Support Load for Tunne lling
Abstract: ABSTRACT: This paper addresses the problem of assessing the stability conditions of shallow excavations. A closed-form statically admissible solution, which allows an estimation of the support pressure where the cavity is at the verge of equilibrium, is presented. The solution has been derived with the assumption that the circular opening is excavated in ground modelled with the Mohr-Coulomb...
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Re-use of tunnel recycled water for the TBM backfilling grout using a stabilizing
Abstract: Mechanized tunneling operations require a high amount of water for different purposes. Most of the water is used for the cooling system of the TBM. Secondary uses of water are for the plants and machinery maintenance, segments intrados before assembly, mucking system and TBM shield cleaning. This secondary water is generally transported through a dewatering system up to a water treatment plant,...
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Real -Time Optimization of Artificial Frost-wall Model Predictions in Deep -Shafts
Abstract: During planning and execution of an artificial ground freezing project, the frost development over time is commonly prognosed using numerical models. The prediction quality of these models relies, however, directly on the given input parameters representing the thermal properties of the lithological layers. These input parameters are, nevertheless, naturally associated with unavoidable...
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Real time shotcrete layer thickness control with digital tools
Abstract: Digitalisation optimises several processes and makes information about the structures easy to access for the whole lifecycle. That's one of the reasons why a couple of industry partners established the Tunnel Digitalisation Center (TDC) in Switzerland. In the TDC, digital tools of each partners related to the tunnelling industry can be proved in the real tunnel environment and furthermore,...
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Recommendations for Efficient Face Support in Slurry Shield Tunnelling
Abstract: In slurry shield tunnelling, a reliable face support is presumed if a support pressure is transferred and the slurry excess pressure provides efficient support pressure on the soil skeleton. To ensure face stability, the support pressure transfer needs to be provided within the theoretical sliding wedge after Horn (1961) at the tunnel face. Therefore, the penetration depth of the bentonite...
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Recommendations for Pseudo-static Deformation for Seismic Analyses of Tunnels
Abstract: Seismic design of tunnels requires in-depth knowledge of ground and seismic properties. Current practice in seismic design evolved from keystone papers in literature while a wide variety of applications scattered from these papers can be found in case studies. In this paper, practical pin-point recommendations are presented for important points in selecting and applying seismic loads. Simple...
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