Long-Term Monitoring of a Tunnel in a Landslide Prone Area by Brillouin-Based Distributed Optical Fiber Sensors

This paper shows the results of the monitoring of the deformations of a tunnel, carried out using a distributed optical fiber strain sensor based on stimulated Brillouin scattering. The artificial tunnel of the national railway crosses the accumulation zone of an active landslide, the Varco d’Izzo e...

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Autores principales:	Aldo Minardo, Ester Catalano, Agnese Coscetta, Giovanni Zeni, Caterina Di Maio, Roberto Vassallo, Luciano Picarelli, Roberto Coviello, Giuseppe Macchia, Luigi Zeni
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	optical fibers distributed sensing remote monitoring early warning systems Chemical technology TP1-1185
Acceso en línea:	https://doaj.org/article/6e5615d52a9b49d59b26dbd88fb9e0bf
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spelling	oai:doaj.org-article:6e5615d52a9b49d59b26dbd88fb9e0bf2021-11-11T19:03:53ZLong-Term Monitoring of a Tunnel in a Landslide Prone Area by Brillouin-Based Distributed Optical Fiber Sensors10.3390/s212170321424-8220https://doaj.org/article/6e5615d52a9b49d59b26dbd88fb9e0bf2021-10-01T00:00:00Zhttps://www.mdpi.com/1424-8220/21/21/7032https://doaj.org/toc/1424-8220This paper shows the results of the monitoring of the deformations of a tunnel, carried out using a distributed optical fiber strain sensor based on stimulated Brillouin scattering. The artificial tunnel of the national railway crosses the accumulation zone of an active landslide, the Varco d’Izzo earthflow, in the southern Italian Apennines. Severely damaged by the landslide movements, the tunnel was demolished and rebuilt in 1992 as a reinforced concrete box flanked by two deep sheet pile walls. In order to detect the onset of potentially dangerous strains of the tunnel structure and follow their time trend, the internal deformations of the tunnel are also monitored by a distributed fiber-optic strain sensor since 2016. The results of the monitoring activity show that the deformation profiles are characterized by strain peaks in correspondence of the structural joints. Furthermore, the elongation of the fiber strands crossing the joints is consistent with the data derived by other measurement systems. Experiments revealed an increase in the time rate of the fiber deformation in the first and last part of the monitoring period when the inclinometers of the area also recorded an acceleration in the landslide movements.Aldo MinardoEster CatalanoAgnese CoscettaGiovanni ZeniCaterina Di MaioRoberto VassalloLuciano PicarelliRoberto CovielloGiuseppe MacchiaLuigi ZeniMDPI AGarticleoptical fibersdistributed sensingremote monitoringearly warning systemsChemical technologyTP1-1185ENSensors, Vol 21, Iss 7032, p 7032 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	optical fibers distributed sensing remote monitoring early warning systems Chemical technology TP1-1185
spellingShingle	optical fibers distributed sensing remote monitoring early warning systems Chemical technology TP1-1185 Aldo Minardo Ester Catalano Agnese Coscetta Giovanni Zeni Caterina Di Maio Roberto Vassallo Luciano Picarelli Roberto Coviello Giuseppe Macchia Luigi Zeni Long-Term Monitoring of a Tunnel in a Landslide Prone Area by Brillouin-Based Distributed Optical Fiber Sensors
description	This paper shows the results of the monitoring of the deformations of a tunnel, carried out using a distributed optical fiber strain sensor based on stimulated Brillouin scattering. The artificial tunnel of the national railway crosses the accumulation zone of an active landslide, the Varco d’Izzo earthflow, in the southern Italian Apennines. Severely damaged by the landslide movements, the tunnel was demolished and rebuilt in 1992 as a reinforced concrete box flanked by two deep sheet pile walls. In order to detect the onset of potentially dangerous strains of the tunnel structure and follow their time trend, the internal deformations of the tunnel are also monitored by a distributed fiber-optic strain sensor since 2016. The results of the monitoring activity show that the deformation profiles are characterized by strain peaks in correspondence of the structural joints. Furthermore, the elongation of the fiber strands crossing the joints is consistent with the data derived by other measurement systems. Experiments revealed an increase in the time rate of the fiber deformation in the first and last part of the monitoring period when the inclinometers of the area also recorded an acceleration in the landslide movements.
format	article
author	Aldo Minardo Ester Catalano Agnese Coscetta Giovanni Zeni Caterina Di Maio Roberto Vassallo Luciano Picarelli Roberto Coviello Giuseppe Macchia Luigi Zeni
author_facet	Aldo Minardo Ester Catalano Agnese Coscetta Giovanni Zeni Caterina Di Maio Roberto Vassallo Luciano Picarelli Roberto Coviello Giuseppe Macchia Luigi Zeni
author_sort	Aldo Minardo
title	Long-Term Monitoring of a Tunnel in a Landslide Prone Area by Brillouin-Based Distributed Optical Fiber Sensors
title_short	Long-Term Monitoring of a Tunnel in a Landslide Prone Area by Brillouin-Based Distributed Optical Fiber Sensors
title_full	Long-Term Monitoring of a Tunnel in a Landslide Prone Area by Brillouin-Based Distributed Optical Fiber Sensors
title_fullStr	Long-Term Monitoring of a Tunnel in a Landslide Prone Area by Brillouin-Based Distributed Optical Fiber Sensors
title_full_unstemmed	Long-Term Monitoring of a Tunnel in a Landslide Prone Area by Brillouin-Based Distributed Optical Fiber Sensors
title_sort	long-term monitoring of a tunnel in a landslide prone area by brillouin-based distributed optical fiber sensors
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/6e5615d52a9b49d59b26dbd88fb9e0bf
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Long-Term Monitoring of a Tunnel in a Landslide Prone Area by Brillouin-Based Distributed Optical Fiber Sensors

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