ABSTRACT
The cantonal road 257 (CR 257) in Switzerland, located at an elevation of 1000–1050 meters, was reinforced with gabion retaining walls to stabilize its slopes. Despite adherence to freeze-thaw resistance standards (EN 1367-1), these structures exhibited significant degradation due to intense freeze-thaw cycles, raising concerns about the suitability of current certification protocols for cold regions. Gabions constructed in 2016, 2017, and 2021 were evaluated through in-situ observations and freeze-thaw sensitivity tests conducted by HEIG-VD’s Geotechnical Laboratory. From March 2022 to April 2023, six gabion cages were inspected monthly. Observations revealed a 10–20% decrease in intact elements and up to 21.5% reduction on lower faces, where degradation was most pronounced. The study highlighted the inadequacy of current standards for extreme conditions, emphasizing the need for revised protocols, improved material selection, and enhanced construction techniques to ensure the long-term durability of gabion structures in harsh environments.
