PSI - Issue 62

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ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 62 (2024) 1097–1104

II Fabre Conference – Existing bridges, viaducts and tunnels: research, innovation and applications (FABRE24) Tunnel convergence monitoring by radar interferometry Marco Barla a *, Santina Aiassa b , Francesco Antolini b , Matthias Twardzik c , Matteo Cecchetti c a Politecnico di Torino, Corso Duca degli Abruzzi 24, 10126 Torino, Italy b Geosolving Srl, Corso Orbassano 336, 10137 Torino, Italy c IDS Georadar SpA, via Augusto Righi 6, 8, 8A, 56121 loc. Ospedaletto (Pisa), Italy Abstract The measurement of displacements at the crown and convergence is crucial in tunnelling. In the case of restoration interventions, the need to demolish the existing lining often occurs leading to the requirement of close control and monitoring to guarantee the safety of the workmanship during the operations. During the demolition works contact sensors cannot be easily used as well as targets would need to be continuously removed and replaced. The use of radar interferometry, a completely remote sensing technique that avoids the need to place targets on the monitored scenario, seems to be a good option to overcome the limitations of traditional sensors. This paper will describe the testing of this remote monitoring technique in an existing tunnel in central Italy, detailing the characteristics of the equipment used, the installation process, the monitoring data, and evaluating the results obtained. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license ( https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer-review under responsibility of Scientific Board Members Keywords: Innovation; Tunnel; Monitoring; Convergence. 1. Introduction Since the 50s, the construction of modern Italian transportation infrastructures such as roads, motorways, and railways has required the excavation of a large number of tunnels to overcome the obstacles generated by a mountainous morphology. Italy is among the countries in the world with the largest number and length of existing II Fabre Conference – Existing bridges, viaducts and tunnels: research, innovation and applications (FABRE24) Tunnel convergence monitoring by radar interferometry Marco Barla a *, Santina Aiassa b , Francesco Antolini b , Matthias Twardzik c , Matteo Cecchetti c a Politecnico di Torino, Corso Duca degli Abruzzi 24, 10126 Torino, Italy b Geosolving Srl, Corso Orbassano 336, 10137 Torino, Italy c IDS Georadar SpA, via Augusto Righi 6, 8, 8A, 56121 loc. Ospedaletto (Pisa), Italy Abstract The measurement of displacements at the crown and convergence is crucial in tunnelling. In the case of restoration interventions, the need to demolish the existing lining often occurs leading to the requirement of close control and monitoring to guarantee the safety of the workmanship during the operations. During the demolition works contact sensors cannot be easily used as well as targets would need to be continuously removed and replaced. The use of radar interferometry, a completely remote sensing technique that avoids the need to place targets on the monitored scenario, seems to be a good option to overcome the limitations of traditional sensors. This paper will describe the testing of this remote monitoring technique in an existing tunnel in central Italy, detailing the characteristics of the equipment used, the installation process, the monitoring data, and evaluating the results obtained. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license ( https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer-review under responsibility of Scientific Board Members Keywords: Innovation; Tunnel; Monitoring; Convergence. 1. Introduction Since the 50s, the construction of modern Italian transportation infrastructures such as roads, motorways, and railways has required the excavation of a large number of tunnels to overcome the obstacles generated by a mountainous morphology. Italy is among the countries in the world with the largest number and length of existing © 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Scientific Board Members

* Corresponding author. Tel.: +39-011-0904824 E-mail address: marco.barla@polito.it * Corresponding author. Tel.: +39-011-0904824 E-mail address: marco.barla@polito.it

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license ( https://creativecommons.org/licenses/by-nc-nd/4. 0 ) Peer-review under responsibility of Scientific Board Member s 2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license ( https://creativecommons.org/licenses/by-nc-nd/4. 0 ) Peer-review under responsibility of Scientific Board Member s

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