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Tensile strength of frozen soil in the temperature range of the frozen fringe
AbstractFrost heaving is a discontinuous phenomenon. It starts from rupture in the partially frozen soil called the frozen fringe and then segregation of an ice lens follows in the rupture. Macroscopically, the above-mentioned cycle repeats consistently as soil freezes. The rupture of the frozen fringe should govern the initial conditions of ice lens growth; however, it has not been studied so far. In this paper, the rupture is studied assuming that it has a close relationship with the tensile strength of the frozen fringe. The compressive strength of frozen soil was well-studied in the last century. However, the tensile strength of frozen soil in frozen fringe temperature range, i.e. 0 to −2 °C, has not yet been explored. Disturbed, reconsolidated, and frozen diluvial silt called Dotan in Japan was used as the test specimen. A newly developed tensile test apparatus was used. Fifteen tensile tests were conducted in the temperature range of +0.6 to −1.31 °C. A steep rise in the tensile strength in the frozen fringe temperature range was observed, being 20 to 70 times higher than that in the unfrozen state. A mechanism of explaining the steep rise in tensile strength is discussed along with the unfrozen water content of Dotan and ice tensile strength, and a simplified soil structure model. The tensile strength of the frozen fringe seems to be primarily due to the tensile strength of the pore ice framework.
Tensile strength of frozen soil in the temperature range of the frozen fringe
AbstractFrost heaving is a discontinuous phenomenon. It starts from rupture in the partially frozen soil called the frozen fringe and then segregation of an ice lens follows in the rupture. Macroscopically, the above-mentioned cycle repeats consistently as soil freezes. The rupture of the frozen fringe should govern the initial conditions of ice lens growth; however, it has not been studied so far. In this paper, the rupture is studied assuming that it has a close relationship with the tensile strength of the frozen fringe. The compressive strength of frozen soil was well-studied in the last century. However, the tensile strength of frozen soil in frozen fringe temperature range, i.e. 0 to −2 °C, has not yet been explored. Disturbed, reconsolidated, and frozen diluvial silt called Dotan in Japan was used as the test specimen. A newly developed tensile test apparatus was used. Fifteen tensile tests were conducted in the temperature range of +0.6 to −1.31 °C. A steep rise in the tensile strength in the frozen fringe temperature range was observed, being 20 to 70 times higher than that in the unfrozen state. A mechanism of explaining the steep rise in tensile strength is discussed along with the unfrozen water content of Dotan and ice tensile strength, and a simplified soil structure model. The tensile strength of the frozen fringe seems to be primarily due to the tensile strength of the pore ice framework.
Tensile strength of frozen soil in the temperature range of the frozen fringe
Akagawa, Satoshi (Autor:in) / Nishisato, Kohei (Autor:in)
Cold Regions, Science and Technology ; 57 ; 13-22
06.01.2009
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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