PSI - Issue 62

Luca Comegna et al. / Procedia Structural Integrity 62 (2024) 484–491 Luca Comegna/ Structural Integrity Procedia 00 (2019) 000 – 000

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particular, the estimated average velocities at the points corresponding to the four inclinometers range along the slope from a minimum of 8 mm/year (inclinometer G8) to a maximum of 15 mm/year (inclinometer G2).

G2

G1-G6-G7

G5 G8

Fig. 5. Numerical FEM modelling results: (a) inclinometric profiles; (b) comparison between calculated (from September 1991 to August 2020) and measured cumulative horizontal displacements, δ cum (modified after Comegna et al., 2023). 5. Conclusions The proposed FEM numerical model highlighted that the movements of an Italian highway embankment in the Apennine chain, interested by a slow subsidence for about 30 years, have been the result of two combined failure mechanisms occurring at different depths. The shallowest one is directly attributable to the mechanical properties of the embankment itself and of a weathered alluvial debris. The deeper mechanism is instead associated to the mobilization of the residual shear strength available along a pre-existing sub-planar surface within the parent formation. The model mostly allowed a chronological reconstruction of the recognized weather-induced kinematics over the examined 30-year period, filling the gaps in the monitoring data caused by both technical problems and a change in the local management. This has been obtained after deriving the slope piezometric regime from a properly calibrated hydrological balance of the study area. The latter has been enabled thanks to the availability of a national gridded climate dataset containing continuous data about local precipitation and temperature. The suggested procedure could be extended to those sites whose monitoring activity is affected by some interruptions thus providing limited and/or temporally missing information. Acknowledgements This research has been supported by MIUR PON R&I 2014-2020 Program (project MITIGO, ARS01_00964) and by VALERE 2019 program (funded by the Università degli Studi della Campania “Luigi Vanvitelli”, project Boldini, D.A., Graziani, A., Ribacchi, R., 2002. Analysis of monitoring data from a deep tunnel in a tectonized clay shale (Raticosa Tunnel, Italy), 3rd Int. Symp. on Geotechnical Aspects of Underground Construction in Soft Ground, vol. 1, 239-244. Chiarini, E., D’Orefice, M., Graciotti, R., La Posta, E., Papasodaro, F., 2008. Foglio 367, Tagliacozzo, Note illustrative della carta geomorfologica d’Italia alla scala 1:50.000, Ed. Servizio Geologico d’Italia, 1-200. Comegna, L., Mandolini, A., Calvanese, C., Manna, D., 2021. Analisi del meccanismo di rottura in un rilevato autostradale fondato su un versante marnoso, Incontro Annuale dei Ricercatori di Geotecnica, IARG 2021, http://www.gnig.it/IARG2021/_Atti_IARG2021.zip. Comegna, L., Mandolini, A., Manna, D., Rianna, G., Reder, A., 2022. Analisi dei cinematismi post-rottura meteo-indotti in un rilevato autostradale fondato su un versante marnoso, Incontro Annuale dei Ricercatori di Geotecnica, IARG 2022, http://www.gnig.it/wp content/uploads/2023/09/Atti_IARG-2022.zip. Comegna, L., Mandolini, A., Manna, D., Rianna, G., Reder, A., 2023. Weather induced post failure kinematics of a highway embankment founded on a marly sandstone slope. Scientific Reports 13, 21808, https://doi.org/10.1038/s41598-023-49181-3. title SEND). References