Communication Dans Un Congrès Année : 2024

Experimental study on the freezing/thawing characteristic curves of sand/clay mixtures

Résumé

The soil freezing characteristic curve (SFCC), relating temperature and unfrozen water content, is essential in modelling hydrothermal processes in permafrost. In this study, the SFCC of sand/clay mixtures, with clay content varying from 0 to 20%, was determined. Compacted soil samples were first subjected to a freezing path (temperature decreasing from 0 °C to -3 °C) followed by a subsequent thawing path (temperature increasing from -3 °C to 0 °C). During this freezing/thawing cycle, volumetric unfrozen water content was measured as a function of soil temperature. The results show a significant hysteresis of the relationship between these two parameters. This finding is important because the hysteresis of SFCC is rarely considered in the modelling of hydro-thermal processes in permafrost. In addition, clear effects of clay content on the thawing curve were identified. At a given temperature, volumetric unfrozen water increases with clay content. Finally, a model predicting the SFCC of sandy soils was introduced, considering the effect of clay content.
Fichier principal
Vignette du fichier
223_VU_8C_km_v2.pdf (348.13 Ko) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-04873985 , version 1 (08-01-2025)

Identifiants

  • HAL Id : hal-04873985 , version 1

Citer

Quoc-Hung Vu, Anh Minh Tang, Jean-Michel Pereira. Experimental study on the freezing/thawing characteristic curves of sand/clay mixtures. The 12th International Conference on Permafrost (ICOP2024), Jun 2024, Whitehorse, Yukon, Canada. ⟨hal-04873985⟩
0 Consultations
0 Téléchargements

Partager

More