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List of products by author: A. Meda
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Feasibility analysis for the use of fiber reinforced concrete precast segment in Nenskra hydraulic tunnels
Abstract: The construction of two hydraulic tunnels with a total length of 30 km is forecast in the Nenskra (Georgia) project. These tunnels will be mechanical excavated with a precast segmental lining. The possibility of using fiber reinforced concrete segment without any traditional reinforcement has been considered. In order to obtain suitable performance of the lining, a process was defined in order...
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Full-scale tests on precast tunnel segments in fiber reinforced concrete
Abstract: The use of Fiber Reinforced Concrete in precast tunnel segments is continuously increasing. The possibility of totally substituting the ordinary steel cage with a fiber reinforcement allows several advantages related to higher quality and reduced costs. Several researches were developed on the field [1-5], showing the feasibility of this solution. A particular attention was paid on enhancing...
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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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Hybrid solution (FRC+GFRP) in segmental lining Extension of Line C in Rome
Abstract: In the last two decades, the use of the fiber reinforced concrete (FRC) and its advantages, met approval in several projects of tunnels made in mechanized excavation. In urban areas, sometimes, the FRC solution alone cannot meet the requirements and a possible hybrid solution, consists of glass fiber reinforced polymer bars (GFRP) and FRC can be adopted to increase the performance of the...
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Numerical analyses for the design of fiber reinforced precast concrete lining segments for ram thrust forces
Abstract: Fibre reinforcement is increasingly used in civil works to improve materials strength against brittle failure mode. In mechanized tunnelling, precast concrete lining design and reinforcement dimensioning is carried out according to various loading schemes covering to the entire service life of segments and rings. One of the most onerous load conditions is related to the longitudinal ram forces...
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On the use of macro synthetic fibres in precast tunnel segments
Abstract: The effectiveness of tunnel segments reinforced with 12 kg/m polymeric macro-fibres in addition to a minimum steel reinforcement ratio has been assessed. Precast tunnel segments have been adopted to test this fibre-reinforced solutions for structural elements, in which the longitudinal reinforcement has been designed to comply only with EC2 minimum reinforcement requirements for no seismic...
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