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List of products by author: E. Dal Negro
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Ground Conditioning for the Excavation of a Rock Mass with High Hydrostatic Pressure Using an EPB: The Experience in...
Abstract: The Interurban Train Line Toluca – Mexico crosses the mountain range of Las Cruces, which is part of the vast TransMexican Volcanic Belt, from east to west, with twin 4.7 km long tunnels, at depths from 15 to 136 m and with a slope of 4% in most of the alignment. Two 8.56 m. diameter EPB shields were used to bore the twin tunnels, facing the extremely complicated geology of the region composed...
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Ground Water Control by Means of Pervious Backfill Grouting
Abstract: Backfill grouting is a specific item defined by the Customers in tunnelling works to obtain different goals. In between these goals, it is worth to consider the ground water control: to release the water table pressure acting against the precast segmental lining, the backfill grouting must be designed as a pervious material. The actual standard grouting mixes (pea gravel with cementitious...
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Innovative waterproofing system for “Rivarolo” Tunnel
Abstract: In the field of the major underground works to ensure structures durability and functional-ity, it is essential to realize a proper waterproofing system. Especially, in Tunnel works all the products used must guarantee elevated performances with high life expectancy up to 100 years, as now frequently requested by technical specifications and customers. The division Underground Technology Team...
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Minimization of asbestos fiber dispersion from the tunnel muck using soil
Abstract: Within the context of “Radimero” TBM tunnels for "Terzo Valico dei Giovi" project, the high-speed rail between Genoa and Milan, geological formations containing Naturally Occurring Asbestos can be crossed. In these conditions, the limitation of dispersion of dust and, consequently, of fibres becomes very important for the TBM excavation process, especially during the transport of the excavated...
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Monte Ceneri Base Tunnel: a successful job-site experience
Abstract: The Monte Ceneri Base Tunnel is the southernmost portion of the new Alp Transit Railway Line crossing the Swiss Alps from South to North. After the Gotthard and Lötschberg Base tunnels, Ceneri Tunnel is the third largest railway tunnel project with his 15.4 km length. Tunnel project allows fast connection for passengers travelling through the Alps, both reducing goods-traffic through...
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Pumping the muck with EPB machines – Considerations about the soil conditioning.The examples of two hydraulic...
Abstract: During the tunnel excavation with EPB machines, the traditional mucking operations with horizontal belt conveyor is sometimes replaced by the use of piston pumps to move the muck from the TBM to the tunnel portal. When this mucking technique is selected, the soil conditioning plays a key role for the improving of the whole excavation process, giving the contractor several advantages in terms of...
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The first successful experience in Poland of tunnel excavation with EPB for the Metro Warsaw
Abstract: The Metro Line 2 of Warsaw is a urban underground railway, being part of the city’s strategy for sustainable transport. Its construction was awarded to a Joint Venture leaded by the Italian company ASTALDI S.p.A.. At the end of 2013 the J.V. successfully completed the construction of the two tunnels which represent the most interesting and challenging part of the project, with the use of 4 TBM...
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Two-component backfill grout system in double shield hard rock TBM. The “Legacy Way” tunnel in Brisbane,...
Abstract: The main purpose of the twin tunnels of the Legacy Way project is to connect the western freeway at Twoowong with the inner City Bypass (ICB) at Kelvin Grove, providing an alternative route to local roads for traffic. The project was awarded to the Consortium Transcity, including the companies Acciona, BMD Constructions and Ghella, which used...
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