Aspects of ice lens formation
It is possible to locate a growing ice lens in a frost heave cell in soil under laboratory conditions by means of a recently devised X-ray technique. If temperature distribution is measured in the sample at the same time, the temperature of the growing face of the ice lens can be determined. The obj...
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| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
1982
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| Online Access: | https://nrc-publications.canada.ca/eng/view/ft/?id=02d445cc-c57f-4b2d-a053-14815ef844fb https://nrc-publications.canada.ca/eng/view/object/?id=02d445cc-c57f-4b2d-a053-14815ef844fb https://nrc-publications.canada.ca/fra/voir/objet/?id=02d445cc-c57f-4b2d-a053-14815ef844fb |
| Summary: | It is possible to locate a growing ice lens in a frost heave cell in soil under laboratory conditions by means of a recently devised X-ray technique. If temperature distribution is measured in the sample at the same time, the temperature of the growing face of the ice lens can be determined. The objective of the study was to validate this method under a range of heaving conditions. It was done by determining ice lens temperatures at various overburden pressures and cold side temperatures; then, by adjusting the ice lens temperature for overburden pressure and pore water salt content, the remaining difference from 0 degrees C was expressed in terms of suction. Suction gradients in unfrozen soil under various freezing conditions were subsequently plotted as a function of rate of moisture flow and a proportionality was shown to exist. In addition the calculated permeability coefficient was the expected value for the material, Leda clay. These results lend credence to use of the X-ray - thermal gradient technique for studying thermal behaviour of ice lens growth. Il est possible de localiser une lentille de glace en croissance dans un échantillon de sol gélif au laboratoire au moyen d'une technique récemment inventée utilisant les rayons X. Si en même temps on mesure la distribution des températures dans l'échantillon, on peut déterminer la température de la face en croissance de la lentille de glace. L'objectif de cette étude était de valider cette méthode pour un grand nombre de conditions expérimentales de soulèvement. On a donc déterminé les températures des lentilles de glace pour diverses pressions provenant du sol de recouvrement et pour diverses températures froides avoisinantes; ensuite, en corrigeant la température des lentilles de glace en fonction de la pression provenant du sol de recouvrement et de la teneur en sel de l'eau des pores, la différence par rapport à la température de 0 degrés C a été exprimée en termes d'aspiration d'eau. Les gradients d'aspiration d'eau dans le sol dégelé correspondant ... |
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