Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Monitored Thermal Performance of Varying Embankment Thickness on Permafrost Foundations
Construction of highway embankments vary in thickness along its planned alignment to maintain horizontal and vertical road geometry requirements. In regions of continuous permafrost, however, the thickness of the overlying embankment greatly impacts the thermal regime of the frozen foundation soil. Thick embankments, exceeding 5 m, usually provide considerable thermal insulation where the frozen soil used to construct the embankment remains frozen in the core, while thin embankments, usually less than 2 m thick, can contribute to permafrost degradation. Climate boundary conditions also play a significant role in the thermal performance of these embankments. In order to study the thermal impact of embankment thickness on permafrost degradation and thermal embankment performance, test sections along the newly-constructed Inuvik-Tuktoyaktuk Highway in the Northwest Territories, Canada, were instrumented with thermistor strings to measure temperature readings at different locations in the embankment fill and foundation soil. This paper presents the results of the monitored temperature for two phases of instrumentation in April 2015 and April 2017 for the thick and thin embankments, respectively. Thermal numerical modelling using site climate data showed considerable agreement with field values and provides confidence for future performance prediction.
Monitored Thermal Performance of Varying Embankment Thickness on Permafrost Foundations
Construction of highway embankments vary in thickness along its planned alignment to maintain horizontal and vertical road geometry requirements. In regions of continuous permafrost, however, the thickness of the overlying embankment greatly impacts the thermal regime of the frozen foundation soil. Thick embankments, exceeding 5 m, usually provide considerable thermal insulation where the frozen soil used to construct the embankment remains frozen in the core, while thin embankments, usually less than 2 m thick, can contribute to permafrost degradation. Climate boundary conditions also play a significant role in the thermal performance of these embankments. In order to study the thermal impact of embankment thickness on permafrost degradation and thermal embankment performance, test sections along the newly-constructed Inuvik-Tuktoyaktuk Highway in the Northwest Territories, Canada, were instrumented with thermistor strings to measure temperature readings at different locations in the embankment fill and foundation soil. This paper presents the results of the monitored temperature for two phases of instrumentation in April 2015 and April 2017 for the thick and thin embankments, respectively. Thermal numerical modelling using site climate data showed considerable agreement with field values and provides confidence for future performance prediction.
Monitored Thermal Performance of Varying Embankment Thickness on Permafrost Foundations
Guzman, E. M. B. De (Autor:in) / Alfaro, M. (Autor:in) / Arenson, L. U. (Autor:in) / Doré, G. (Autor:in)
18th International Conference on Cold Regions Engineering and 8th Canadian Permafrost Conference ; 2019 ; Quebec City, Quebec, Canada
Cold Regions Engineering 2019 ; 128-136
08.08.2019
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Highway Embankment on Degrading Permafrost
| ASCE | 2009
Thermal regime simulation of embankment and berm in permafrost
| Online Contents | 2008