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Papers from WTC and ITA conferences have been made available as PDF documents.
ProceedingsThere are 1984 documents.
List of endorsed conferences
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WTC
World Tunnelling Congress
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Numerical Investigation on Urban Tunnelling under Groundwater Drawdown Condition – Impact on ground movement
Abstract: In this paper the ground surface movement characteristics associated with urban tunneling in water bearing ground are presented based on the results from a series of finite element (FE) stress pore pressure coupled analysis. A hypothetical tunneling condition was considered with due consideration of urban tunneling situations. A 2D FE model, capable of simulating the relevant tunneling...
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Pressure design in unlined tunnels and shafts
Abstract: Unlined tunnels and underground powerhouses have been constructed in Norway starting from the end of World War I in 1919. From the valuable experience gained through the design, construction and operation of tunnels in the past 100 years in Norway, unlined pressure tunnels have been developed reaching 1046 m hydrostatic head for Nye-Tyin hydropower project being a world record at present. In...
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Kombilösung Karlsruhe: A technical and logistical challenge
Abstract: The greater area of Karlsruhe, Germany, has a fast growing public transport system. In the last 15 years the number of transported people increased by 45 % to around 178 million and therefore demands a new suburban railway tunnel, which is actually under construction. Design and construction process are highly influenced by the logistical and technical challenges derived from the heartbeat of...
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The Study on the Resistance Difference of Shield TBM Segment according to Support and Loading Condition of Bending Test
Abstract: The full scale segment bending test was carried out to find the design failure load of segment lining after it was made in the plant. And non-linear analysis method was studied for model it because many spaces, times and money were to require doing the bending test in lab. The rollerroller supports condition has mostly used to segment experiment. In non-linear analysis, the design failure load...
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Los Teques Metro Line 2, Venezuela – ground treatment for tunnel cavern in graphitc schist
Abstract: For the Caracas region’s Metro Line 2, currently in progress, a tunnel cavern (cross-section 290 m, length 302 m) was excavated in saturated weathered graphitc schist. The upper part was driven through transition material between soil and weathered rock with very high SPTs in almost impenetrable ground. Hardness increased quickly with depth of predominantly weathered rock in the lower part of...
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A Study on Planning of Network-Based Rock Mass Classification and Decision Making System
Abstract: Ground assessment processes based on face mapping are closely related to the stability and economic feasibility of NATM tunnels while the expertise of field engineers is a highly important factor. In Korea, tunnel collapse accidents and economic losses have continued to occur due to technical, economic, and institutional problems during NATM tunnel construction. Such problems have led to...
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Geotechnical Investigation and Risk Assessment at Budapest Metro Line 4
Abstract: The construction of the structure of Phase1 of Budapest Metro has been completed. The geotechnical investigations carried out on the basis of the Geotechnical Base Line Report (GBR) and Risk Assessment have considerably decreased geotechnical risks. The comparison of the amount of investigations carried out before the tender and in the construction phase reflects well the efforts to ensuring a...
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Prerequisite Tasks for Construction of Deep Underground Road in Korea: Part 2. Fire protection, ventilation in tunnel...
Abstract: Because of insufficient spaces for road facilities, traffic congestion at a dangerous level, negative views to construction environment and soaring land price in metropolitan areas, coupled with developed excavation and tunneling technologies, needs for building deep underground roads have been increasingly growing. Korea has been planned or designed the construction: for example U-Smartway was...
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An underground solution for a collapsed hydraulic conduit affected by an active landslide in Costa Rica
Abstract: In a hydroelectric plant in northern Costa Rica, affected by major landslides, an evaluation was required to assess the possibility of stabilizing the ground to save the pipeline. The rate of displacement of the ground in the pipe vicinity has reached the maximum of 10 cm per month, which directly affects the pipeline, which has had to realign several times to keep operating. However, the...
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Development of an SFRC segment within a TBM tunnel: flexural beam test for evaluation of SFRC
Abstract: A Korean research project examining the development of full steel fiber reinforced concrete (SFRC) tunnel segments was launched during 2011 and is ongoing. The latest part of this project focused on member-scale evaluation of SFRC and here we present the results of laboratory tests undertaken during 2013. These tests used 16 beam specimens cast with SFRC, and the flexural performance of these...
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The underground section of the T6 tramway near Paris - EPB Tunneling with low overburden in an urban area
Abstract: The underground section of the LRT T6 line will extend the public transport network towards the West of Paris and create new connections. The project consists of a 600m at-grade section followed by a 1500m long tunnel of 9.15m diameter, with two underground stations of 25m depth. Geologically the project is situated in a heterogeneous sedimentary sequence consisting of a series of marls,...
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Modern drill and blast excavation
Abstract: In underground excavation, whether tunnel, space for civil engineering or drift for a mine is considered, a tendency for rapid excavation has been seen. When speaking about conventional excavation, the aim is firstly to execute the cycle as fast as possible and secondly to maximize the advance per blast. Still it should be remembered that the excavation is implemented in a way that the quality...
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Design, construction and behavior of deep shafts, for the reception and launching of a tunnel boring machine
Abstract: This paper will present the design, construction and preliminary behavior of two cylindrical shafts, with an internal finished diameter of 12 m and approximately 118 and 78 m in depth, with structural preparations at its bottom for the reception and launching of a tunnel boring machine. The design was done with the aid of a numerical simulation by FEM, to represent the construction procedure of...
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Comparison of estimated and actual measured face pressure in EPB-TBM tunnelling
Abstract: Tunnel face instability is the most common problem in difficult geotechnical conditions. The evaluation of a suitable face support pressure is a critical element in the design and construction phases of EPB-TBM and Slurry-TBM tunnelling technologies. In this study, measured tunnel face pressure in Dez-Ghomroud transfer tunnel (Lot.1) is compared with the results from analytical methods. This...
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TBM selection methodology using the AHP (Analytic Hierarchy Process) Method
Abstract: In this study, TBM selection methods to meet soil and site conditions were presented. Factors and excavation equipment affecting TBM selection by soil and environmental condition were selected and classified. Weights between equipment and influencing factors selected were calculated by applying the AHP method. The results of the analysis influence factors, Ground condition was a major factor in...
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Gaussian Filters for Effective Back Analysis of Soil Parameters using Tunneling-induced Deformations
Abstract: This work shows that Gaussian filters can be applied very effectively to back analysis of the geomaterial parameters using tunneling- induced deformations. We examine and compare the performance obtained from the extended Kalman filter (EKF) and a filter more capable of handling nonlinear model - the unscented Kalman filter (UKF). The effectiveness of the set of Gaussian filters for back...
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