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List of products by author: U. Maidl
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Adaptation of the TBM-Shield EPB for Tunnels with High Overburden and High Water Pressure for the Metro Los Teques...
Abstract: For the excavation of Lot 3 of the Metro Los Teques Line 2 in Venezuela, a great chal-lenge must be overcome due to a change of the alignment with respect to the original design. The new ground conditions are not appropriate for the typical application of EPB shields, which is the methodology used so far in the previous lots. The 3 km Lot 3 is excavated in areas with high overburden, high water...
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Emerging Data Processing Technologies in MechanizedTunnelling
Abstract: Programmable Logic Controllers (PLC) or microprocessors are standard features on Tunnel Boring Machines (TBM) to monitor and record various sensory systems providing options for control and automation of machine processes. The data collected from these sensory systems and channelled through PLC is stored for real-time analysis and use by the operators and per typical construction specifications...
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EPB Shield Tunnelling Through a Volcanic Chain In Mexico
Abstract: The contribution gives insight to the challenges and respective engineering measures in the MexicoToluca Interurban Train tunnel project. Each of the twin tunnels has a length of 4.7 km and is excavated with two EBP shield machines of 8.57 m diameter. The tunnel overburden varies from 1 diameter up to 130 meters and hydrostatic pressures up to approximately 6.0 bar are expected. The geology of...
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First experiences gained with the hybrid EPB technology in the Rio de Janeiro sands
Abstract: The shield-driven tunnel of Metro Rio Line 4 between the General Osório II and Gávea stations has an approximate length of 5.2 km. The double-track tunnels have an internal diameter of 10.33 m with a 0.40 m thick segmental lining. The excavation is carried out using an Earth Pressure Balanced shield with an excavation diameter of 11.53 m.
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Innovative Hybrid EPB Tunnelling in Rio de Janeiro
Abstract: The Line 4 South being constructed in Rio de Janeiro crosses complex geology that includes a long stretch of sand bounded by two stretches of hard, highly abrasive rock. These geological conditions, combined with the fact that the project is located in a distinct urban area, creates a demanding project scenario where special care needs to be taken. After carrying out an evaluation to determine...
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Real-time process controlling of TBM production
Abstract: The contribution gives an overview of state-of-the-art process controlling in mechanized tunneling. A web-based ubiquitous and integrated data warehouse forms the backbone of software that combines analysis of machine sensor data, project specifications, shift reporting and geodetic information in a time- and space-correlated data structure. Supporting the generation of a knowledge base made of...
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Slurry Properties and Operation Modes with VD Shield Technology to Handle Varying Ground Conditions at the...
Abstract: The Variable Density shield drives at the Forrestfield Airport Link tunnel project in Perth cross varying soil conditions composed by different types of sand formations and also by more cohesive clogging-prone formations. The present contribution will show how for the excavation under the Perth International Airport premises in such varying ground conditions there are no perfect, but rather...
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Taking Advantage from Building Information Modelling and Digital Data Management in TBM Tunnelling
Abstract: Tunnelling projects are notorious for exceeding time and cost limits, which are often a consequence of inaccurate interpretation of information and therefore wrong predictions. The prediction quality, however, can be significantly improved by digitalisation of design and construction processes. The contribution summarises the current instruments and possibilities in the digitalisation of the...
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