Buried corrugated steel culvert failure mechanisms due to environmental deteriorations
Environmental factors and ageing influence deterioration mechanisms in buried metal culverts that may impair mechanical performance over the service life. Corrosion occurs, primarily at the culvert haunches, due to changes in the water level and repeated exposure to air circulation. This action provides a pathway for water to flow into the backfill that may cause erosion and the development of soil voids adjacent to the culvert. In this study, the behavior of corrugated metal culverts, with a circular cross section subject to overburden and surface loads, is simulated using calibrated finite element modelling procedures. A three-dimensional model of a deteriorated culvert-soil system was developed for different cover depths. The relationship between the culvert wall section loss, due to corrosion, on the load carrying capacity is investigated. Erosion voids are created around the buried culverts with distinct sizes and shapes. For the parameters examined, the soil erosion had a greater influence on pipe/soil interaction mechanisms, which ultimately influenced culvert performance and serviceability, than the effect of corrosion. The erosion void size and location were influential factors on the culvert performance that could result in local bucking and a decrease in the service life.
|Keywords||Buried Metal Culvert, Corrosion, Erosion Voids, Finite Element Method|
|Conference||International Conference on Sustainable Infrastructure 2019: Leading Resilient Communities through the 21st Century|
Nakhostin, E. (E.), Kenny, S, & Sivathayalan, S. (S.). (2019). Buried corrugated steel culvert failure mechanisms due to environmental deteriorations. In International Conference on Sustainable Infrastructure 2019: Leading Resilient Communities through the 21st Century - Proceedings of the International Conference on Sustainable Infrastructure 2019 (pp. 29–40).