Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Frost Depth Penetration and Frost Heave in Frost Susceptible Soils
The natural freezing and thawing of soils can dramatically affect the soils thermal and mechanical properties, which can have destructive effects on structures built upon those soils. Previous testing in this field has attempted to predict the frost penetration depth, based on the soil, thermal, and hydrodynamic properties. To assist with future model developments, multiple frost-susceptible soil types were tested with a variety of moisture conditions. Thermal conductivity and temperature were measured as a function of depth throughout multiple multi-day frost and thaw cycles. The radial strain and frost heave were also measured in order to identify thermal expansion. All of these were selected to provide additional information to future models, requiring multiple sources of data to improve accuracy. It was identified that moisture migration was likely the most significant factor in frost heave and frost penetration, as free water sources in porous low plasticity silt (ML) material produced the largest deformations, while there was minimal heave in other frost susceptible but minimally porous materials. The thermal conductivity was found to not increase in the same manner across all samples, but would increase in some locations in each sample, which are theorized to correspond to where the moisture was most concentrated, such as where ice formation was at its highest. All of these conclusions, along with further investigation into moisture properties, will enable better frost depth prediction and frost heave potential.
Frost Depth Penetration and Frost Heave in Frost Susceptible Soils
The natural freezing and thawing of soils can dramatically affect the soils thermal and mechanical properties, which can have destructive effects on structures built upon those soils. Previous testing in this field has attempted to predict the frost penetration depth, based on the soil, thermal, and hydrodynamic properties. To assist with future model developments, multiple frost-susceptible soil types were tested with a variety of moisture conditions. Thermal conductivity and temperature were measured as a function of depth throughout multiple multi-day frost and thaw cycles. The radial strain and frost heave were also measured in order to identify thermal expansion. All of these were selected to provide additional information to future models, requiring multiple sources of data to improve accuracy. It was identified that moisture migration was likely the most significant factor in frost heave and frost penetration, as free water sources in porous low plasticity silt (ML) material produced the largest deformations, while there was minimal heave in other frost susceptible but minimally porous materials. The thermal conductivity was found to not increase in the same manner across all samples, but would increase in some locations in each sample, which are theorized to correspond to where the moisture was most concentrated, such as where ice formation was at its highest. All of these conclusions, along with further investigation into moisture properties, will enable better frost depth prediction and frost heave potential.
Frost Depth Penetration and Frost Heave in Frost Susceptible Soils
Lein, W. A. (Autor:in) / Slone, S. M. (Autor:in) / Smith, C. E. (Autor:in) / Bernier, A. P. (Autor:in)
International Airfield and Highway Pavements Conference 2019 ; 2019 ; Chicago, Illinois
Airfield and Highway Pavements 2019 ; 493-503
18.07.2019
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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