PSI - Issue 62

Salvatore Aiello et al. / Procedia Structural Integrity 62 (2024) 1128–1136 S. Aiello et al./ Structural Integrity Procedia 00 (2019) 000 – 000

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5. Conclusion Applying reverse engineering techniques plays a pivotal role in developing a resilient monitoring strategy. By scrutinizing threshold values derived from reverse engineering, we have been able to prioritize interventions in a nuanced, case-specific manner. These values have been seamlessly integrated into synoptic tables, which have been designed to aid decision-making processes. These comprehensive tables encapsulate the findings of semesterly investigations, presenting an IQOA classification for defects, water leakage, and cracks. These surveys correlate their findings with the recorded under-thickness values of the concrete lining, the strength of the lining concrete, and the GSI values of the rock mass. They also provide information about resonant zones, presence of discontinuities like cracks defining enclosed spaces, as well as identifying surface voids in the lining. This methodology underscores the synergy between the outcomes of these investigations and the application of reverse engineering techniques. This synergistic approach facilitates the derivation of indirect evaluations, such as the assessment of lining capacity. In conclusion, the extraction of threshold values through reverse engineering paves the way for the establishment of a monitoring system. This system serves as a mitigating barrier within a robust, multi-criteria maintenance strategy. This innovative approach could ensure the durability and safety of Mont Blanc Tunnel, thereby underscoring the indispensable role of reverse engineering in contemporary practice. 6. Acknowledgement This study was carried out within the «Title» project –funded by the Ministero dell’Univers ità e della Ricerca – within the PRIN 2022 program (D.D.104 - 02/02/2022). This manuscript reflects only the authors’ views and opinions and the Ministry cannot be considered responsible for them References Aiello, S., De Biagi, V., Chiaia, B., Alessio, C., Baccolini, L., & Fantuz, R. (2023). Analytical study of anomalies in tunnel lining thickness: Critical temperature variations. In Expanding Underground-Knowledge and Passion to Make a Positive Impact on the World (pp. 2951 2958). CRC Press. Baggio, P., & Malaroda, R. (1963). I tipi litologici incontrati nella parte italiana del traforo del Monte Bianco tra le progressive 2500 e 3700. Accademia nazionale dei lincei. Baggio, P., & Malaroda, R. (1964). Il traforo del Monte Bianco: prime osservazioni geologiche sul tratto dalla progressiva 4900 alla progressiva 5800 (parte italiana). Accademia Nazionale dei Lincei. Baggio, P., & Mezzacasa, G. (1971). Carta geologica della zona tra la Brenva e T. Jetoula (Massiccio del Monte Bianco). STEM Mucchi, Modena. Brown, E. T., Bray, J. W., Ladanyi, B., & Hoek, E. (1983). Ground response curves for rock tunnels. Journal of geotechnical Engineering, 109(1), 15-39. Centre d’Etudes des Tunnels (CETU), “Road tunnel civil engineering inspection guide. Book 1: from disorder to analysis, from analysis to rating.”, January 2015 Centre d’Etudes des Tunnels (CETU), “Road tunnel civil engineering inspection guide. Book 2: catalogue of deteriorations.”, J anuary 2015 Chiaia, B., Marasco, G., & Aiello, S. (2022). Deep convolutional neural network for multi-level non-invasive tunnel lining assessment. Frontiers of Structural and Civil Engineering, 16(2), 214-223. Dal Piaz, G. V., & Argentieri, A. (2021). 150 years of plans, geological survey and drilling for the Fréjus to Mont Blanc tunnels across the Alpine chain: an historical review. Italian Journal of Geosciences, 140(2), 169-204. Frangopol, D. M., & Liu, M. (2019). Maintenance and management of civil infrastructure based on condition, safety, optimization, and life-cycle cost. Structures and Infrastructure Systems, 96-108. Friedman, R. (2021). You Can Learn Anything Through Reverse Engineering. Harvard Business Review. Hassanpour, J., Khoshkar, A. S., Farasani, M. G., & Hashemnejad, A. (2022). Investigating the relationships between rock mass classification systems based on data from mechanized tunneling projects in Iran. Bulletin of Engineering Geology and the Environment, 81(4), 147. Italian Infrastructure Ministry, “Linee Guida per la redazione del Piano di Sorveglianza delle Gallerie” (Guidelines for Tunnel Monitoring Plan), 10/04/2021, Rome. Italian Infrastructure Ministry, “Manuale Ispezione Gallerie” (Tunnel Inspection Manual), 25/05/2020, Rome. Lacroix, D. (2001). The Mont Blanc tunnel fire. What happened and what has been learned. In PROCEEDINGS OF THE FOURTH INTERNATIONAL CONFERENCE ON SAFETY IN ROAD AND RAIL TUNNELS, HELD MADRID, SPAIN, 2-6 APRIL 2001. Lunardi, G., Cassani, G., Gatti, M., Amadi, A., Marchiondelli, A., Malacalza, M., ... & Selleri, A. (2023). Tunnel assessment: The Italian case. In Expanding Underground-Knowledge and Passion to Make a Positive Impact on the World (pp. 3429-3436). CRC Press