PSI - Issue 62

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com Procedia Structural Integrity 62 (2024) 484–491

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

II Fabre Conference – Existing bridges, viaducts and tunnels: research, innovation and applications (FABRE24) Failure mechanism in a highway embankment founded on a sloping tectonised flysch formation Luca Comegna a,b *, Alessandro Mandolini b , Denise Manna b , Guido Rianna b , Alfredo Reder b a Università degli Studi della Campania Luigi Vanvitelli, Via Roma 29, Aversa 81031, Italy b Fondazione Centro Euro-Mediterraneo sui Cambiamenti Climatici, Via T.A. Edison, Caserta 81100, Italy Abstract A highway embankment founded on a slope in a tectonised flysch formation of the Apennines chain (Central Italy) has been affected for about 30 years by continuous slow movements that caused some fractures on the road paving thus requiring periodic maintenance works. Due to the relevance of the damaged infrastructure, different investigation and monitoring campaigns have been carried out to collect information about the properties of the involved soils, the groundwater regime and the displacement field. Field monitoring, in particular, revealed that the movements were the result of a failure mechanism affecting both the embankment and the foundation soils. In particular, the observed displacements showed a weather-induced seasonal trend featured by acceleration/deceleration stages during the wet/dry periods. In order to better understand the detected mechanical response, a numerical model accounting for a soil hydrological balance of the interested area has been developed allowing a reliable historical reconstruction of the displacement regime. II Fabre Conference – Existing bridges, viaducts and tunnels: research, innovation and applications (FABRE24) Failure mechanism in a highway embankment founded on a sloping tectonised flysch formation Luca Comegna a,b *, Alessandro Mandolini b , Denise Manna b , Guido Rianna b , Alfredo Reder b a Università degli Studi della Campania Luigi Vanvitelli, Via Roma 29, Aversa 81031, Italy b Fondazione Centro Euro-Mediterraneo sui Cambiamenti Climatici, Via T.A. Edison, Caserta 81100, Italy Abstract A highway embankment founded on a slope in a tectonised flysch formation of the Apennines chain (Central Italy) has been affected for about 30 years by continuous slow movements that caused some fractures on the road paving thus requiring periodic maintenance works. Due to the relevance of the damaged infrastructure, different investigation and monitoring campaigns have been carried out to collect information about the properties of the involved soils, the groundwater regime and the displacement field. Field monitoring, in particular, revealed that the movements were the result of a failure mechanism affecting both the embankment and the foundation soils. In particular, the observed displacements showed a weather-induced seasonal trend featured by acceleration/deceleration stages during the wet/dry periods. In order to better understand the detected mechanical response, a numerical model accounting for a soil hydrological balance of the interested area has been developed allowing a reliable historical reconstruction of the displacement regime. Keywords: highway embankment; infrastructure; tectonised flysch; slope failure; weather-induced kinematics; numerical modelling. © 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: highway embankment; infrastructure; tectonised flysch; slope failure; weather-induced kinematics; numerical modelling.

* Corresponding author. Tel.: +39-081-5010384; fax: +39-081-5010463. E-mail address: luca.comegna@unicampania.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 Members 10.1016/j.prostr.2024.09.069 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 * Corresponding author. Tel.: +39-081-5010384; fax: +39-081-5010463. E-mail address: luca.comegna@unicampania.it