Della Ragione, Gianluigi (2024) An Integrated Approach for Assessing the Impact of Tunnel Excavations in Urban Areas. [Tesi di dottorato]

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Abstract

In the evolving landscape of civil engineering, innovative monitoring solutions play a pivotal role, particularly in industrialized societies. This thesis delves into the application of two advanced monitoring techniques, Distributed Fibre Optic Sensing (DFOS) and Interferometric Synthetic Aperture Radar (InSAR), within the realm of geotechnical engineering, focusing on tunneling excavations in urban environments. The exploration of DFOS begins with small-scale experiments and 3D Finite Element Analysis (FEA). Numerical results showcase the technique’s efficacy in real-world scenarios. The thesis then transitions to InSAR, employing it in two real case studies: the metro lines in Naples and Barcelona. The first case investigate the technique’s suitability for free-field conditions, while the second assesses tunnel-induced displacements on a residential structure affected by excavation. DFOS emerges as a robust method for the detection of strain profiles at depth caused by excavations. However, further research is needed, especially concerning the soil-cable interface in diverse soil types. At the same time, InSAR proved adapted at capturing superficial tunnel-induced subsidence, albeit constrained by the limitations of its one-look side geometry. This research contributes to the advancement of geotechnical engineering monitoring techniques, providing valuable insights for assessing the impacts of tunneling in urban settings. The findings underscore the significance of merging experimental validations with real-world applications, paving the way for refined monitoring practices in civil engineering.

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