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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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Seismic Behavior of Shallow NATM Tunnels Excavated in Improved Ground
Abstract: Up to now, cut and cover method has been widely used as the main tunnelling method for excavating a shallow over burden tunnel in unconsolidated ground. Recently, due to the development of the construction and measurement techniques, the construction of the shallow over burden tunnel in soft ground using New Austrian Tunnelling Method (NATM) have been increasing. For example, during the...
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Standard Practice and Latest Developments in Tunnel Segment Tolerances, Measurement, and Dimensional Control
Abstract: Tolerances are the allowable deviations of actual dimensions of segmental lining either as individual components or as a system from their design dimensions. Deviations from the nominal geometry can be accepted when they don’t result in lining damages and don’t negatively impact the intended function and service of the tunnel. On one hand, it is important to achieve the highest possible level...
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Stability analysis and optimum support design of tunnel No. 7 in Tariakdareh Karmozd coal mine using UDEC software
Abstract: I Stability analysis and design of optimum support for underground structures are complicated issues due to various conditions in soil and rock types, geological structure, regional tensions, etc. So, it is necessary to use different methods to analysis the structure stability and incorporating engineering judgment to find the best support system. The aim of this research is stability analysis...
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Single Shield TBM Performance Analysis in Mixed ground Conditions: A Case Study in the Dudullu Bostanci Metro Tunnel,...
Abstract: The performance analysis of single shield TBMs in mixed ground conditions in the Dudullu-Bostanci tunnel is presented in this study. Dudullu-Bostanci Metro Project is a mega underground construction project being constructed in Asian part of Istanbul, which runs approximately north to south under the densely-populated Anatolian side of the city. Four earth pressure machines (EPB-TBMs) having...
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Simulation and analysis in 3D of TBM disc normal and gauge cutters coupled with SPH method
Abstract: the mechanism of rock fragmentation by disc cutters during tunneling is the key to the tbm (tunnel boring machine) performance. In order to study the characteristics of rock cracks in the rock fragmentation process, various numerical methods (FEm, FDm and DEm) were performed to establish the three-dimensional model. In this paper, coupled with Sph method the FEm method is used to simulate the...
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Simplified seismic analysis for axial deformation on cylindrical underground structure
Abstract: The seismic deformation method to evaluate the axial deformation of cylindrical underground structure is reconsidered through the exact solution based on the elastodynamics. The results show that the solution calculated by an elastic foundation model shows good agreement with that calculated by elastodynamics except when frequency of the seismic wave is high and the axial wavelength is short....
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Shotcrete Reinforced with Polypropylene Fibers for Tunnelling Lining
Abstract: Considering cities random growth and the increasing need for infrastructures, the underground have been becoming a better option to fullfill most of civil engineering needs. Nowadays, underground constructions, and more specifically those classified as tunnels, are executed through completely diversified construction techniques. Most of them are based on shotcrete lining in order to both...
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Shaft and tunnel construction for deep sewer systems
Abstract: With a growing world population and increasing urbanization, volumes of sewage are rising especially in large cities, which require larger capacities in sewage transport and treatment. The systems built decades ago need to be modernized, extended or replaced to ensure efficient and sustainable wastewater management.The first large-scale Deep Tunnel Sewerage System (DTSS) was installed in 2008...
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Safety in the III Valico Tunnel Complex
Abstract: The III Valico Tunnel Complex is composed by the tunnels of the Genoa-Milan HighSpeed Railway Line, the Voltri Linking Section and the interconnections between these lines. The rail line from Genoa to Novi Ligure plain develops entirely in tunnel, with the exception of a short stretch at Libarna Area. The III Valico line is about 53 km of which more than 47 km in tunnels, including the...
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Risk reduction effect of the supportive protective system (SPS) at Tunnel - Part 1: Examination of reliability and...
Abstract: In workplaces of tunnels, everybody try to prevent accidents with individual protection device for each machine. However, even if all individual protections simultaneously operate, it would be difficult to cover all area. So it might be failed to detect worker who entered in the work area. Usually workers who operate machine in the tunnel should have access authority and should be well-trained....
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Impact of the Rock Mass Quality on the cost of the Conventional Excavation: The experience acquired during the...
Abstract: The production of a tunnel, defined as the ratio between excavation length and the relevant time, as is known, is closely related to the existing state of stress on site, to the type of rock mass and to its structure, i.e., more generally, to its quality. High rock mass quality gives higher productions, while poor rock mass quality leads to have low production, with a law that does not have...
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Right choice of the tunnel construction method: a key factor to reduce technical and financial risks
Abstract: Doubtless, tunnel design involves much higher uncertainties than any other civil engineering work.In recent decades there has been an extensive growth in the world of underground constructions that are the most appropriate response to the lack of available surface space and for the needs in terms of environmental and social integration of infrastructures; on the other hand, tunnels involve high...
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Research on Settlement Characteristics and Calculation of Immersed Tunnels with Soft Foundation
Abstract: For the settlement characteristics and calculation of immersed tunnels with soft foundation, there is no sound experience for reference. Foundation settlement analysis method and design-parameter selection are important for large immersed tunnel design and construction, especially for tunnels with soft bed.The Dalian Bay Immersed Tunnel, with a full length of 3080m, consists of thirteen...
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Research on Mechanical Characteristics of Longitudinal Joint of Shield Tunnel
Abstract: Shield tunnel is a kind of fabricated structure which consists of segments and bolts. The existence of joints make the tunnel have the characteristic of flexibility. The longitudinal joints bear cyclic load of tension and compression when under seismic load, reflecting its features of opening and compressing. This paper combines the numerical analysis and experiments, investigating the feature...
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Research on Cracking Behavior of Tunnel in Carbonaceous Slate Rock Mass during Construction Period
Abstract: A case study of the cracking behavior in a highway tunnel structure during construction period is researched in this article, including fgure out the causes and evolution of cracking. The large deformation of rock mass is the major infuence of the damaging behavior, which is based on the feld investigation. The results highlight the regions of cracking on tunnel bottom structure, emphasize the...
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Refined flow to analyze the viability of tunnels in road planning
Abstract: When planning an improve the capacity of two-lanes highways, it is always sought to allocate the new road parallel to the existing lane, in order to facilitate the operations of maintenance by the owner, and the changes of direction for the users, when necessary. In this sense, in the beginning of the year 2000, the designs for upgrade from twolanes for four-lanes expressway of the road...
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