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List of products by author: D. Nebbia
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Lesson Learned During the EPB TBM Launch Using Umbilical and Muck Pump
Abstract: The launch of a Tunnel Boring Machine (TBM) is one of the most challenging activity parts of the construction of a tunnel. Challenges are coming from limited space available, learning curve, concurrence of other activities and in some cases from the geological conditions. Launching a TBM is an extraordinary and complicated operation requiring a great level of planning. The Earth Pressure...
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Segmental Lining Design Optimization Against Reliable TBM Thrusting Conditions
Abstract: TBM thrust is, in many precast segmental lining designs, the critical loading condition when deciding between only FRC (Fibres Reinforced Concrete) or hybrid solutions (fibres + steel conventional bars). Traditionally, the TBM (Tunnel Boring Machine) pushing value used as reference by designers, when structurally checking this temporary stage, has been the maximum (or exceptional) thrust...
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Tailskin Brushes replacement under difficult ground conditions - Three R ivers
Abstract: As part of the 3RPORT Project, an 8 km tunnel is being excavated underneath the three rivers of Fort Wayne using a 5.8 m diameter Slurry Tunnel Boring Machine. The groundwater pressure at the tunnel axis ranges from 4.5 to 5.3 bar. The rock mass hydraulic conductivity is very high with water inflows up to 630 l/s imposing significant challenges to the project. After excavating 470 m of the TBM...
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