Modeling Artificial Ground Freezing for Construction of Two Tunnels of a Metro Station in Napoli (Italy)
An artificial ground freezing (AGF) technique in the horizontal direction has been employed in Naples (Italy), in order to ensure the stability and waterproofing of soil during the excavation of two tunnels in a real underground station. The artificial freezing technique consists of letting a coolan...
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doaj-2eca7abb2c454ee9b1d7627e054cf8d12020-11-25T02:57:38ZengMDPI AGEnergies1996-10732020-03-01135127210.3390/en13051272en13051272Modeling Artificial Ground Freezing for Construction of Two Tunnels of a Metro Station in Napoli (Italy)Alessandro Mauro0Gennaro Normino1Filippo Cavuoto2Pasquale Marotta3Nicola Massarotti4Dipartimento di Ingegneria, Università degli Studi di Napoli “Parthenope”, Centro Direzionale, Isola C4, 80143 Napoli, ItalyDipartimento di Ingegneria, Università degli Studi di Napoli “Parthenope”, Centro Direzionale, Isola C4, 80143 Napoli, ItalyStudio Cavuoto, Via Benedetto Brin, 63/D2, 80142 Napoli, ItalyConsorzio di Ricerca per l’Ambiente i Veicoli l’Energia e i Biocombustibili (CRAVEB), Centro Direzionale, Is. C4–80143 Napoli, ItalyDipartimento di Ingegneria, Università degli Studi di Napoli “Parthenope”, Centro Direzionale, Isola C4, 80143 Napoli, ItalyAn artificial ground freezing (AGF) technique in the horizontal direction has been employed in Naples (Italy), in order to ensure the stability and waterproofing of soil during the excavation of two tunnels in a real underground station. The artificial freezing technique consists of letting a coolant fluid, with a temperature lower than the surrounding ground, circulate inside probes positioned along the perimeter of the gallery. In this paper, the authors propose an efficient numerical model to analyze heat transfer during the whole excavation process for which this AGF technique was used. The model takes into account the water phase change process, and has been employed to analyze phenomena occurring in three cross sections of the galleries. The aim of the work is to analyze the thermal behavior of the ground during the freezing phases, to optimize the freezing process, and to evaluate the thickness of frozen wall obtained. The steps to realize the entire excavation of the tunnels, and the evolution of the frozen wall during the working phases, have been considered. In particular, the present model has allowed us to calculate the thickness of the frozen wall equal to 2.1 m after fourteen days of nitrogen feeding.https://www.mdpi.com/1996-1073/13/5/1272numerical modelingheat transferartificial ground freezingunderground stationmetro in napoligeo heating |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Alessandro Mauro Gennaro Normino Filippo Cavuoto Pasquale Marotta Nicola Massarotti |
spellingShingle |
Alessandro Mauro Gennaro Normino Filippo Cavuoto Pasquale Marotta Nicola Massarotti Modeling Artificial Ground Freezing for Construction of Two Tunnels of a Metro Station in Napoli (Italy) Energies numerical modeling heat transfer artificial ground freezing underground station metro in napoli geo heating |
author_facet |
Alessandro Mauro Gennaro Normino Filippo Cavuoto Pasquale Marotta Nicola Massarotti |
author_sort |
Alessandro Mauro |
title |
Modeling Artificial Ground Freezing for Construction of Two Tunnels of a Metro Station in Napoli (Italy) |
title_short |
Modeling Artificial Ground Freezing for Construction of Two Tunnels of a Metro Station in Napoli (Italy) |
title_full |
Modeling Artificial Ground Freezing for Construction of Two Tunnels of a Metro Station in Napoli (Italy) |
title_fullStr |
Modeling Artificial Ground Freezing for Construction of Two Tunnels of a Metro Station in Napoli (Italy) |
title_full_unstemmed |
Modeling Artificial Ground Freezing for Construction of Two Tunnels of a Metro Station in Napoli (Italy) |
title_sort |
modeling artificial ground freezing for construction of two tunnels of a metro station in napoli (italy) |
publisher |
MDPI AG |
series |
Energies |
issn |
1996-1073 |
publishDate |
2020-03-01 |
description |
An artificial ground freezing (AGF) technique in the horizontal direction has been employed in Naples (Italy), in order to ensure the stability and waterproofing of soil during the excavation of two tunnels in a real underground station. The artificial freezing technique consists of letting a coolant fluid, with a temperature lower than the surrounding ground, circulate inside probes positioned along the perimeter of the gallery. In this paper, the authors propose an efficient numerical model to analyze heat transfer during the whole excavation process for which this AGF technique was used. The model takes into account the water phase change process, and has been employed to analyze phenomena occurring in three cross sections of the galleries. The aim of the work is to analyze the thermal behavior of the ground during the freezing phases, to optimize the freezing process, and to evaluate the thickness of frozen wall obtained. The steps to realize the entire excavation of the tunnels, and the evolution of the frozen wall during the working phases, have been considered. In particular, the present model has allowed us to calculate the thickness of the frozen wall equal to 2.1 m after fourteen days of nitrogen feeding. |
topic |
numerical modeling heat transfer artificial ground freezing underground station metro in napoli geo heating |
url |
https://www.mdpi.com/1996-1073/13/5/1272 |
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