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Heat flow and temperatures in three culverts embedded in road embankments subjected to seasonal frost: [Flux de chaleur et températures dans trois ponceaux routiers soumis au gel saisonnier]
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-4658-6284
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-1365-8552
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0003-1935-1743
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-3369-4542
2022 (English)In: Proceedings of the 20th International Conference on Soil Mechanics and Geotechnical Engineering / [ed] M. Rahman; M. Jaksa, Australian Geomechanics Society , 2022, p. 3987-3991Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Australian Geomechanics Society , 2022. p. 3987-3991
National Category
Geotechnical Engineering and Engineering Geology Infrastructure Engineering
Research subject
Soil Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-99175OAI: oai:DiVA.org:ltu-99175DiVA, id: diva2:1780806
Conference
20th International Conference on Soil Mechanics and Geotechnical Engineering 2022 (ICSMGE 2022), Sydney, Australia, May 1-5, 2022
Projects
BVFF
Funder
Swedish Transport Administration
Note

ISBN för värdpublikation: 978-0-9946261-4-1

Available from: 2023-07-06 Created: 2023-07-06 Last updated: 2025-02-05Bibliographically approved
In thesis
1. On Thermal Conditions of Culverts in Cold Regions
Open this publication in new window or tab >>On Thermal Conditions of Culverts in Cold Regions
2024 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Culverts play a crucial role in road and railway construction projects by facilitating drainage in embankments. However, in cold climates with seasonally frozen ground, frost-related damages around culverts are a common challenge. Culverts alter the thermal conditions of the surrounding embankment by allowing cold air to flow through the structure, leading to deeper frost penetration compared to adjacent areas. Accurately estimating the depth of frost penetration and the resulting heave is challenging due to the complex thermal dynamics within culverts, influenced by factors such as air temperature, wind, solar radiation, construction materials, and the dimensions of both the culvert and the embankment. To better understand these thermal conditions, a field investigation was conducted near Luleå, Northern Sweden, monitoring three culverts with varying dimensions (diameter/length: 0.6/20 m, 0.8/17 m, and 3.4/30 m) from October 2020 to June 2021. Data on temperatures and air velocities inside the culverts, along with outside air temperatures, were collected and analysed. The study revealed that both snow cover and wind significantly influence temperature distribution within the culverts. During the early freezing period, when snow cover is insufficient to block the ends of the culverts, airflow through the culvert causes internal temperatures to closely follow external air temperatures, with higher airflow velocities resulting in a greater correlation. Conversely, when the culverts become obstructed by snow, internal temperatures stabilize and are less influenced by external conditions. A second field investigation from January to April 2023 focused on measuring soil temperatures around a fourth culvert (0.6 m diameter, 22 m length) to determine frost depth. The temperatures 0.6 m from the centre of the culvert are measured from 0.1 to 2.5 m depth from the pavement surface. Control measurements are carried out in a nearby road section without the culvert. The results indicated that presence of a culvert that is unobstructed by snow leads to a rapid and deeper frost penetration in the road compared to a control area without a culvert.

Despite the extensive data collection, predicting thermal boundary conditions within culverts remains complex. To address this, a new modelling approach was developed using COMSOL Multiphysics, coupling airflow and heat transfer to simulate thermal conditions inside the culvert. The model, based on the secondary field investigation, was divided into scenarios representing unobstructed and snow-obstructed culverts. The frost depth data was used to validate the model's boundary conditions, which were then used to conduct a parametric study on the influence of culvert diameter on frost depth. The study concludes that a non-isothermal flow model can effectively determine thermal boundary conditions in culverts and assess the influence of airflow of frost depth. The presence of airflow within the culvert during the freezing period leads to increased frost penetration around the culverts, which increases with larger culvert sizes. However, a sufficiently thick snow cover that blocks the ends of the culvert can inhibit further frost depth progression

Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2024
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
Keywords
Culverts, Seasonally frozen ground, Cold climate, Numerical modelling
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-108969 (URN)978-91-8048-618-7 (ISBN)978-91-8048-619-4 (ISBN)
Public defence
2024-11-27, E632, Luleå University of Technology, Luleå, 10:00 (English)
Opponent
Supervisors
Available from: 2024-08-27 Created: 2024-08-27 Last updated: 2025-02-05Bibliographically approved

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Tommik, KarinaKnutsson, SvenLaue, JanLintzén, Nina

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