PSI - Issue 62

Ettore De La Grennelais et al. / Procedia Structural Integrity 62 (2024) 1089–1096 Tobia Zordan/ Structural Integrity Procedia 00 (2019) 000 – 000

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The ongoing activity carried out by BOLINA, within the Guidelines for Tunnels, involves the implementation of what is outlined in Levels 0, 1, and 2, and in some cases, the design of monitoring systems. The list of tunnels currently undergoing activity is provided in Fig.2. Specifically, the case study of the Comelico Tunnel, where the activity is already completed, will be presented. This case study is considered of particular interest for the design of a structural monitoring system, the installation of which is currently underway. 3. The inventory - level 0 The implementation of a comprehensive inventory of a tunnel asset managed by an entity represents a crucial step in assessing the risk for the entire infrastructure network. The inventory provides a detailed overview of structural conditions, safety systems, and equipment, enabling accurate monitoring of performance. Through the collection of detailed data, potential risks can be identified, preventive measures can be implemented, and maintenance interventions can be planned proactively. This approach not only enhances the safety of individual tunnels but also contributes to mitigating risks on a systemic scale, promoting the resilience of the entire network. Below in Fig.2 is a typical example of the Level 0 inventory sheet completion.

Fig. 2. Typical Lev.0 file for tunnel inventory.

3.1. Survey and generation of a physical model For each of the examined tunnels, a georeferenced physical model is generated. Additionally, a "mobile mapping" activity is conducted, providing a photogrammetric survey aimed at identifying the defect state for each section of the tunnel. Individual defects are further captured with detailed images and positioned within the tunnel. Below in Fig.3 is a representation of a portion of a georeferenced physical model of one of the tunnels currently under study.

Fig. 3. Example of a tunnel physical model.