Frost heave mechanism in welded tuff
Abstract Segregation freezing, one of the heave mechanisms in freezing soils, is shown to be responsible for the breakdown of freezing welded tuff. Frost heave tests of welded tuff have proved that segregation freezing occurs in rock by revealing ice lens growth, pore water flow and the existence of...
| Published in: | Permafrost and Periglacial Processes |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Wiley
1991
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1002/ppp.3430020405 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.3430020405 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.3430020405 |
| Summary: | Abstract Segregation freezing, one of the heave mechanisms in freezing soils, is shown to be responsible for the breakdown of freezing welded tuff. Frost heave tests of welded tuff have proved that segregation freezing occurs in rock by revealing ice lens growth, pore water flow and the existence of hydraulic gradient driving water to the freezing front. The physical characteristics of the tuff, such as pore microstructure, mineral composition, unfrozen water conditions, permeability, and so forth, are similar to those of frost‐susceptible soils. An empirical equation, derived from the tuffs water retention curve and unfrozen water content measurements with pulsed NMR, relates the segregation freezing temperature and frost heave pressure. This equation is discussed in the context of the governing thermodynamics. We suggest that the segregation freezing concept is generally applicable to common rocks. La formation de glace de ségrégation, processus bien connu dans le gel des sols est responsable de la fracturation par le gel des tuffs cimentés à chaud. La formation de la glace de ségrégation est démontrée par la croissance de lentilles de glace, l'écoulement de l'eau des pores et l'existence d'un gradient hydraulique amenant l'eau au front de gel. |
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